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When we commissioned Vanguard, one request was that she be built and surveyed to UK MCA Category (0). So, what was driving this request, and how did it unfold in reality? The driver was simply concerned that: We are commissioning a build 7000 miles from "home" with limited oversight. Buying into a design at the time was unproven as the first model was still in the yard. Safety for our family, given the places we wanted to explore Born of a knowledge of how fundamentally easy it is to be certified to CE Category (A) no matter what the design failures! Now, I'll wager most of our readers are not particularly shy retiring types, but we all know that hollow feeling in our stomachs. Whereas we can't avoid fear, we can diminish it, and MCA Category (0) was one way we achieved this end by building to the standard of a well founded, seawoirthy, workboat. This set of standards originated in the UK. They are commercial standards from vessels not otherwise covered by Class. The under 24m, red-headed stepchildren of the big boat industry. Fishing boats, ferries, work boats, and anything with a commercial application that carries paid crew or passengers. It protects those third parties from danger by overseeing the design and outfitting to a good minimum standard. So when the owner of FPB-78, Iron Lady, wanted to operate paid adventure cruises in Antarctica and elsewhere, she became the one FPB to be certified to this standard. UK MCA Category (0), MGN 280 Vanguard is designed within the Marine Guidance Note UK MGN 280 guidelines. It underscores a comprehensive list, from stability to the use of plastic fittings in engine rooms, from communications to safety equipment to first aid kits. The build is then surveyed, including tests, sea trials, and certification. This rigorous process is then repeated annually, ensuring standards are maintained. So, what do we want to achieve? We wanted to build to a good standard, but as we will not use Vanguard for commercial purposes, we do not necessarily want to feel the costs of keeping to that standard where it need not apply. So "built to" or "easily brought to" is our goal. Let me give you an example. One item specified in some detail is the First Aid equipment. The appropriate kit rolls in at some GBP12.000 plus upkeep. Drugs, Defibrillators, Oxygen Generators, stretchers ..... We have a good first aid kit already on board, US Coast Guard approved. So, there is no point in changing that; we will accept not gaining certification with a caveat that we will be certified if we replace our kits with one meeting MGN 280. Another example would be SOLAS-approved life rafts requiring yearly inspection and weighing a ton (80kg!) instead of Wheel Marked 6-man life rafts of a lesser but still excellent standard, much lighter and with a longer inspection period. We are going for a pragmatic approach to achieving our safe, reliable, and stable build, but not trying to be perfect. So what's the reality of this? Our first survey was for stability. A UK MCA-appointed surveyor witnessed an inclining test. Those results are in for assessment, verbally, I'm told we are good to go. The second was a two-day preliminary survey conducted by the same UK MCA Surveyor. The checklist was detailed, though some items needed to be relevant (rigging, for example, sailboat stuff). That generated an exception list split into: must do, should do I want to think about! The result was a much shorter interim report with a detailed list of what needs fixing. In our example, there was nothing major but a long list of items to trip us up if they needed to be fixed. That independent oversight is so informative. The surveyor is not our enemy, but neither is he to be messed with. I quite like that world. So what was the result? We had some 57 non-compliance items reported (see survey exception report above). Of those, 52 were easily fixed within four weeks. Five remain and will be accepted as non-compliant. As a result, Vanguard will not gain the full MCA Category (0) certification. However, she was surveyed and built to this standard and has a very clear and identified number of non-compliant items. These none compliances are easily rectified for commercial operation. This places Vanguard in a select group of sub-24 M yachts that have achieved such a standard, aligning with our initial goal. We accomplished what we set out to do without incurring the additional expense and complications of full compliance. How might this train of thought affect a new build? Turkish builders are very good at some tasks but must improve at others. Believe me on this point. That does not mean going elsewhere, but it does mean that a prospective owner should take steps to mitigate the downside. MCA Cat (0) Using a class society that inspects during the build, such as RINA Drafting the Contract to link stage payments to inspection, QC and Project management with director-level signoff. The upshot is a good new build for less than the resale cost of a much older but very similar hull. One of the many commendable features of those FPB designs is that they maintain their value like no other. Follow this link: FPB 70 for sale. It is an excellent and proven hull with specifications almost identical to XPM-78. Chris Leigh-Jones

Like a family before Christmas, the last few weeks have been a flurry of activity as our Explorer Yacht, Vanguard, inched towards her completion. There is nothing like a deadline; our yard set one, and that was the day it happened: Tuesday, 3rd October. After seemingly years of planning and building, we were about to get our first glimpse of our alternative future. The launch process Launching is a process like many others. The underbody of the hull is completed, antifouled, running gear attached, anodes in place, and chocks moved to paint the last few areas. Scaffolding was removed, and temporary handrails installed. Meanwhile, workers continued internally with the engine room, helm stations, and fitting Treadmaster high grip panels to the external decks. Chocks were then rationalized in number and repositioned so the transporter could manoeuver underneath to raise the hull from her slumber within the yard. Out of the Yard and down to the travel lift next to Damen Shipyard. The hull of our explorer yacht was then transferred to this lift and slowly lowered into the waiting Medditteranian. Half in, and some 14 anxious yard employees were on board checking everywhere for potential leaks, which continued until she floated under her buoyancy. Our Explorer Yacht floats with no leaks! Vanguard had a distinct port list and quite a tendency to roll like a football as she wallowed in the dock before being towed to her temporary stern-to-mooring. This is a time when it's very easy to panic: what have we done? It's also a time for cooler heads or maybe more experienced ones. Vanguard is a light ship with no fluids on board, so the center of gravity is much higher than planned. A time when several launches have gone wrong, resulting in a capsize or partial one at best. So what happens now? Initial results The first thing was to assess what we have, the easiest point of reference being the top line of the antifouling. Trim with 100mm below her marks on the stern and 500mm at the bow: 50 mm port list and a roll period of about 7.5 seconds. No one would go to sea in a hull behaving like this, but we have only started to trim her properly. Adding 3t of fresh water to the forward tanks, we have 150mm at the stern (which was gratifying), 300mm at the bow, and a 7-second roll period. Better, but we have a long way to go yet. The forward freshwater tanks will take in a total of 4.2t, and we can use one of the 1.5t aft tanks to correct the list. Globally, the hull will sink 12mm for each 1t added, and we have some 150mm to her marks all around, assuming the stern continues to rise as the bow approaches the horizontal. Video of my super tolerant wife, Sebrina, christening Vanguard in time honored fashion. She promosed not to miss with the bottle! Independant advice from the experts Given the resources that have gone into Vanguard, this early stage is nerve-wracking. Today, I feel slightly better, which I will take wholeheartedly. Dennis Harjarma from Artnautica is following as data arrives, and we have Eyos Expeditions helping with their expertise and experience of similar commissioning and voyaging with FPB hulls. More in the next blog as we begin to understand what we have. Chris Leigh-Jones Years ago I watched a Royal Navy Type 23 frigate being launched stern first on the River Tyne in Newcastle upon Tyne, UK. They had two apprentices on the aft deck, underneath the flight deck. A truly mean trick, they got very wet on that day.

There’s a particular kind of research you do when you’re planning to take your boat somewhere properly Arctic. Not the casual “let’s look at weather windows” research. The kind where you’re trying to understand whether that white thing on the horizon is going to dent your hull or sink your boat. I spent months asking questions about Greenland ice. Some were smart questions. Some were embarrassingly basic. All of them mattered. Here’s what I learned, roughly in the order I learned it, which is definitely not the order I should have learned it. The Ice Taxonomy You Actually Need Growlers: Less than a meter high, invisible on radar, dangerous. Bergy bits: One to five meters above the waterline, weighing 1,000–25,000 tons. Leads: Open channels between ice floes are your best friend for navigation. Polynyas: Open water surrounded by ice, often unstable. Time Travel in Frozen Form Photos by Julia Prinselaar Greenland’s ice isn’t just frozen seawater; it’s a time capsule. Ice cores up to 130,000 years old. Jakobshavn Glacier flows at 20 meters per day. Each iceberg carries trapped air bubbles—snapshots of Earth’s atmosphere tens of thousands of years ago. How Far North Can You Actually Go? Most yachts can reach Uummannaq (70°40’N). Extreme north: Qaanaaq (Thule, 77°30’N) requires ice‑strengthened hulls. Cruising season: July–early September. Charts are unreliable and rely on paper charts, sonar, and local knowledge. Navigation Infrastructure You’ll Actually Use Arctic Commando: Position reporting across the Labrador Sea. Asiaat Radio: Coastal navigation reporting, weather updates, and ice conditions. Local authorities track vessel movements; miss a check‑in, and they’ll start asking questions. The Weight of Ignorance Bergy bits weigh thousands of tons; even “small” ones can punch through hull plating. Fenders and boat hooks help, but preparation is key. Aluminum hulls withstand impacts that would destroy fiberglass. Every dent tells a story and/or a lesson learned. What I’d Tell My Past Self Respect the ice’s age and mass. Local knowledge isn’t optional. Decision-making matters most. Key Lessons Learned The Greenland ice sheet didn’t get the memo that the ice age ended. It’s still flowing, still calving, still teaching. We logged 55,000 miles aboard Vanguard, but Greenland taught us more in two months than the previous two years combined. Ice teaches fast — or painfully. Selected photos by Julia Prinselaar, used with permission. Your Questions Welcome Cruised in ice? Share your lessons. Planning high‑latitude? Ask about navigation, hulls, or equipment. Photography credits: Julia Prinselaar (botanical images)

A first‑hand account of navigating Greenland and Svalbard with two of the Arctic’s most experienced ice pilots. This summer aboard the Vanguard Explorer Yacht, we had the privilege of sailing with two remarkable ice pilots, Nick Weis‑Fogh and Torill Estella Pfaff. They spend their lives navigating the high Arctic, from Svalbard to West Greenland, and their knowledge transformed our voyage from a risky experiment into a safe, humbling education. Their guidance exposed us to aspects of Arctic navigation we would never have understood on our own. These are the practical, uncomfortable, and sometimes surprising lessons we learned from cruising in one of the most unforgiving environments on earth. Living in the Arctic Life aboard an explorer yacht in Greenland is simple, raw, and completely dependent on preparation. Refrigeration becomes optional — eggs, milk, beer, and wine stay cold outdoors even in midsummer. Provisioning ashore is limited — bring everything you need; local stores are basic. Fishing is practical — Arctic char is easily caught with a gill net (retrieve it with a broom handle or it will tangle). Fjord cod are parasite‑ridden — paleoecological cod are a better target. There is no night — 24‑hour daylight turns every hour into a passage opportunity. Local hospitality is genuine — Nova Scotia, Newfoundland, Labrador, and Greenland communities welcome strangers warmly. Take time to drift, to watch the scenery, to understand the people. The Arctic rewards patience. Anchoring in Ice Waters Anchoring in Greenland is equal parts seamanship and improvisation. Large bergs cannot enter shallow water — use depth as protection. Small bergs drift with wind and current — push them away with a long pole (never while underway). Avoid kelp beds — they foul anchors and are difficult to clear. Look for anchorages near moraines or stream outflows — kelp avoids brackish water. Charts are vague or nonexistent — rely on sonar and slow movement. Estimate depth as 6–8 times the visible height of a berg. Seabeds are often bedrock — finding good holding takes time. In the Arctic, anchoring is not routine. It’s strategy. Weather: Unpredictable and Unforgiving Greenland’s weather is hyper‑local and changes without warning. Increase scope significantly in bad weather. Keep engines on standby in tight anchorages. Sudden wind shifts can unseat even a well‑set anchor. Expect sleet, snow, and freezing seas even in midsummer. A reliable heater is essential. Forecasts help, but instinct and preparation matter more. Navigation in Ice Fields Navigation in Arctic ice is slow, deliberate, and deeply humbling. Ice fields may look impenetrable — but patient searching reveals leads. Steering is ineffective at low speed — rely on thrusters and pulsing water across rudders. Fog often reduces visibility to 100 meters — eyesight and radar are critical. Growlers and bergy bits are massive underwater — avoid contact entirely. Pass large bergs on the upwind side to avoid growlers. Melting ice hisses like snakes — trapped ancient air escaping. Bergs can roll or collapse — stay at least one berg‑height away. Transparent ice is nearly invisible — watch water behavior for clues. Inuit fishermen know these waters better than any chart — follow their lead. The hull is not a battering ram. Respect the ice. Key Lessons Learned Respect the ice — even “small” bergs weigh thousands of tons. Local expertise is priceless — Nick and Estella’s guidance made the voyage possible. Judgment matters more than equipment — knowing when to wait, push, or turn back is the ultimate skill. The Arctic teaches quickly or painfully. Why This Matters for Explorer Yacht Owners Arctic cruising demands preparation, humility, and experience Vanguard’s journey reflects the realities owners must understand This is not aspirational cruising; it’s operational reality That distinction is what defines true explorer yachts No sales pitch. Just authority.

When most people imagine Greenland, they see endless ice and towering bergs. But if you stop looking at the horizon and instead look down, you’ll discover a hidden world: mosses, lichens, mushrooms, and wildflowers thriving in cracks of granite and tundra soil. This blog shares what we found when we slowed down, crouched low, and paid attention to Greenland’s ground cover. The Scale Shift Nobody Warns You About On the tundra near Ilulissat, I found seventeen different plant species within arm’s reach. Arctic botany is subtle, easily missed if you’re only scanning the horizon. The real richness lies at your feet. Where to Actually Look Plants thrive in places you might overlook: Sheltered areas protected from wind South‑facing slopes warmed by the sun Rock crevices and cracks in granite Valleys where meltwater collects What You’re Actually Looking At Greenland’s secret garden includes: Arctic Willow — tiny, ground‑hugging shrubs Mountain Avens — white blossoms across tundra slopes Arctic Poppies — bright yellow flowers in sheltered spots Cotton Grass — tufts waving in the wind Moss Campion — pink cushions in rocky cracks Crowberries — edible berries in late summer Lichens — painting granite in orange, green, and black What You Won’t Find No trees. No beach logs. No flotsam. Greenland’s beaches are pristine, stripped of the debris you’d expect elsewhere. The absence of clutter is part of the Arctic’s stark beauty. The Brief Summer Compression Arctic summer is short and intense. Plants grow and bloom in weeks, creating a time‑lapse effect across the tundra. Blink, and you’ll miss it. The Practice of Slowing Down To see Greenland’s secret garden, you need to: Walk slowly Get low to the ground Visit in late July or early August Look in sheltered spots Leave plants untouched The Long View Greenland’s beauty isn’t only in its icebergs. It’s in the resilience of plants that bloom against all odds. Changing perspective from horizon to ground reveals a richer, more intimate Arctic.

Prep work completed at Yacht Management (South Florida) preparing to depart. An Accidental Record: North America East Coast Transit We didn't go looking for a record. There was no stopwatch, no declaration, and no sense that this had to be “a thing.” Only later, after routes were compared and distances tallied, did it become clear that no hybrid-drive motor yacht of this size appears to have completed a documented round-trip from southern Florida to the high Arctic and back along the North American Atlantic seaboard. If this was a record, it was discovered after the fact. Vanguard was built for function, not fashion. Aluminum, ice-strengthened, MCA Category 2 specified, hybrid drive with no conventional generators. The idea was simple: go further, stay longer, and keep moving when conditions turn against you. The 2025 season would prove whether that thinking held up offshore. Leaving the Comfort Zone We departed Fort Lauderdale after final work at Yacht Management and slipped across to Port Everglades. From there the coast unfolded in familiar steps. Hilton Head, Charleston via the Intracoastal, Georgetown until the tone changed approaching Cape Hatteras, with a northerly already setting in. North of Hatteras the margins tightened. Norfolk and the Chesapeake gave way to exposed Atlantic legs, shallow inlets, New York Harbor, the East River, and the relentless tidal arithmetic of Long Island Sound. New England followed Groton, Jamestown, the Cape Cod Canal, Provincetown, and Gloucester, but weather windows shortened and systems stopped being pampered. Maine sharpened everything. Rockland. Rockport. Belfast. Bar Harbor. Halifax came next, the last familiar port before the map stopped offering easy exits. Commitment North From Halifax the voyage became deliberate. Atlantic Canada passed in hard miles and harder decisions: Canso, Port Hawkesbury, the Bras d'Or system, Codroy, Port au Choix, St. Barbe, and finally the Strait of Belle Isle. Here we met proper ice—large bergs drifting south in the Labrador Current. Port au Choix sent us off with 90-knot winds tearing through the anchorage. Violent, uncomfortable, but preferable to being pinned to the dock with a six-foot swell rolling straight in. From Belle Isle to Nuuk is not a passage you embellish: 820 nautical miles of cold, grey water, often hostile. At night, charts become secondary. Radar becomes everything. Greenland Doesn’t Care Greenland offered no easy welcomes. Nuuk first, then north through Aasiaat, Qeqertarsuaq, and into Disko Bay. Arctic Commando and Aasiaat Radio became constants. Ice navigation stopped being an event and became routine. Big bergs upwind. Grounded ice watched carefully. The small stuff and the dangerous stuff are never ignored. And if this voyage sounds rough, spare a thought for the four young Norwegian men we met sailing a 50-year-old Colin Archer ketch south from Pond Inlet and the Northwest Passage. No excess. No margin. Just seamanship and stubbornness—life pared to the bone. Rodebay marked 72° North and another attempt through the ice guarding Ilulissat. Once through, progress eased in sheltered coastal strips. We departed again in dense fog, following Inuit boats and trusting local knowledge of ice leads more than anything coming from space. Then we turned south. The Long Way Home Nuuk had one final lesson. A 90-knot storm pinned Vanguard between two battered ex-Russian ice-hardened supply vessels. When the first snow settled ashore, the decision was obvious. We left. An easterly carried us west toward Baffin Island, skirting the northern edge of Hurricane Erin. She passed south but not before reminding us who was in charge. West of Port au Choix in the Gulf of St. Lawrence, the reminder arrived properly. Darkness. A hard hit. Bow up, stern down. Engine-room bilge alarms screaming. Four hours to shore. Repairs in Neddy Harbor happened only because Newfoundlanders see a damaged boat as a sailor in trouble, not an inconvenience. From there the route unwound in reverse: Halifax. New Bedford. New York. Cape Hatteras again. A good northerly was forecast. Three boats were heading south. By then, we knew what Vanguard could tolerate. We left Sandy Hook anyway. Carefully. Charleston followed, then the final run to Fort Lauderdale. When the lines were secured again, the numbers finally settled: 7,450 nautical miles, once port movements, day running, ice maneuvering, and local operations were included. What Stayed With Us We pushed Vanguard harder than most yachts of her size will ever be pushed. We found weaknesses. We confirmed strengths. The hybrid system carried propulsion and all electrical loads throughout the expedition, averaging around 4 liters per nautical mile across the full voyage. But that isn't what lingers. What remains are the people. Two sons who will always remember the year we went north. Valery, our Ukrainian delivery skipper. Nick, an ice pilot and Viking by nature, and his sailor wife, Estella. Magnus and Julia. Eric and Caleb. Friends in Darien. Canadian customs officers who chose pragmatism over procedure. Greenland Air pilots who flew in spares and opened their homes. Newfoundlanders who opened workshops, kitchens, and doors when we arrived tired and damaged. If you want a holiday, go to the Bahamas. If you want your perspective shifted, go north. And when you think you've gone far enough go further.Until it hurts. That's where exploration begins. The Route in Numbers (2025) Total Distance Logged: 7,450 NM (includes port movements, day running, ice manoeuvring, and local operations) Regional Breakdown: U.S. Southeast & Mid-Atlantic: ~860 NM U.S. Northeast & New England: ~1,125 NM Atlantic Canada: ~1,210 NM Labrador Sea → Greenland (outbound): ~820 NM Greenland coastal operations: ~1,000 NM Greenland → Canada (return): ~820 NM U.S. East Coast return to Florida: ~1,615 NM TOTAL: 7,450 NM Why the Hybrid Drive Mattered Vanguard operates without traditional standalone generators. All propulsion and onboard electrical loads are supplied through her hybrid-drive system, allowing propulsion engines to act as power plants when required and enabling flexible load management underway or at anchor. In practical terms, this meant high electrical capacity for navigation, heating, and hotel loads in Arctic conditions, reduced fuel consumption over long distances, and system redundancy without complexity. Averaging ~4 L/NM across a full North Atlantic and Arctic season, the system proved itself not as a concept but as a working solution in conditions where failure is not an option.

The whole thing began with a puzzle. Our water-in-oil alarm kept reporting "moderate contamination," yet every time I cracked the filter drain, the sample came out perfectly clean. No water, no emulsification, nothing. Either the sensor had developed a personality disorder, or something upstream was tricking it. The uncomfortable possibility: stray electrical currents wandering through the engine block and upsetting every grounded sensor they could find. Rebuilding Vanguard's engine charging system after the Gulf of St. Lawrence flooding only added to the mystery. Once everything came back online, the earth-leakage monitor began shouting about two faults: a positive-to-earth on the port engine and a negative-to-earth on the starboard. That combination strongly suggested the alternators were no longer floating as they should. Finding the Culprit The first clue was on the starboard engine. The alternator leads had been installed backwards. Fixing the polarity mismatch didn't clear the leakage by itself, but it did at least bring both engines back into the same electrical universe. The real culprit was on the port engine: a bent positive cable lug pressed just close enough to the alternator casing to make intermittent contact. On an isolated-return alternator, that tiny contact defeats the entire point of isolation. The alternator suddenly uses the engine block as a return path, and the boat's earth-fault system reacts accordingly. also explains why the Water-in-Oil sensor thought something terrible was happening stray current and grounded sensors make very poor companions. Why Isolation Matters on Aluminum Hulls Marine alternators on aluminum vessels must remain electrically floating. Both B+ and B– are insulated from the housing. The alternator case should never carry current. When it does, you get false leakage alarms, false contamination alarms, and a growing suspicion that the yacht is trying to gaslight you. The fix was simple: reposition the cable eyes, ensure proper clearance from the alternator case, support the conductors, and verify isolation. Once done, every fault cleared immediately Water-in-Oil included. A final thanks to David Millard of Manxme.com an exceptional marine electrician in Charleston and a patient teacher for aging engineers who are still convinced they already know it all. Keeping an Eye on Stray Currents Metal hulls and stray electrical currents coexist about as well as cats and swimming lessons. Any unintended current path accelerates corrosion to the hull or appendages, often quietly and long before anyone sees a paint blister. To stay ahead of that, our Turkish electrical contractor installed a three-channel ground-loop monitor covering the 24-volt DC cabinet and both John Deere engines. It offers three simple functions: a lamp test, and positive- or negative-side ground-fault indication for each engine. So far it has proven easy to use and a remarkably fast early-warning system for problems long before they become expensive. Lessons Learned Verify alternator isolation on aluminum hulls – Even small contact points can create major fault conditions False sensor readings often point to electrical issues – Don't assume the sensor is faulty; check for stray currents first Ground-loop monitoring is essential – Early detection prevents expensive corrosion damage Document cable routing during installation – Prevents issues during future maintenance or flooding recovery Have you experienced similar electrical gremlins on your explorer yacht? Share your troubleshooting experiences or questions in the comments below. Related Reading: Explore more technical deep dives in our Systems & Engineering section, or learn about Vanguard's complete electrical system design.

Explorer Yacht Electrical System Design – Power System We split Vanguard’s electrical system into three core components: Power System Hotel System Instrumentation System Because explorer yachts must operate reliably in remote conditions, redundancy drives the entire design strategy. We categorize components into: Fully redundant (duplicated and parallel) High MTBF (such as hull, anchoring gear) Alternative-based redundancy (shore power vs onboard generation) Non-critical systems (luxury items, entertainment) Main Hybrid E-Motors and Power Philosophy Vanguard, like Mobius before her, uses a battery-centric power strategy: Shore power, solar, and the main engines feed the high-capacity banks Propulsion, hotel loads, and navigation draw from these banks Two independent 60kWh banks provide full 50% redundancy Lithium technology was selected for its rapid charge/discharge performance, with design allowances for thermal constraints and safety. High Voltage DC Bus & Propulsion Inverters The power bank floats between 550–770VDC. Instead of multiple complex harness runs, we use a DC bus bar, improving reliability and simplifying fault tracing. Each hybrid motor: Draws power via a VFD inverter Also functions as a charger when the diesel engines back-drive the hybrid units Each engine can be completely electrically isolated, maintaining safe redundancy pathways. AC Distribution, Transformers & Shore Isolation Two independent transformer systems (20–25kVA each) cleanly supply the 230VAC three-phase hotel load bus. Key features: Active-front-end inverters for pure sine wave AC Delta-configured output windings Harmonic filtering Shore power isolated via dedicated transformer winding Full galvanic and electrical separation from marina earth This prevents hull corrosion and protects crew from floating-neutral faults. Solar, DC Systems & Cold Start Capability An 8kW solar array feeds the hotel system through MPPT controllers. Once the house batteries are full, excess solar is routed back through power inverters to charge the main banks — a cascade charging architecture. House batteries supply: 24VDC 48VDC Emergency cold-start capability Firefly/lead-acid chemistry provides superior performance in low temperatures compared to lithium. Power & Energy Management Systems The yacht includes: Power management: handles shore charging, switching, and source control Energy management: oversees hybrid drives, thruster systems, inverters, and diesel engines in generation mode The system is duplicated and accessible from: Bridge Flybridge Engine room MFD displays Cooling Systems & Future Expandability All major inverters and hybrid drives use: Redundant water/glycol cooling loops Hull skin tanks 50/50 fluid mix <35°C inlet temperature The architecture allows for future hybrid or battery upgrades without redesigning the entire electrical system. A full Factory Acceptance Test (FAT) is scheduled before shipping to catch issues early

I’m writing this partly to organize my own thoughts and partly to document the design safety process behind an explorer yacht. Having ideas is easy; turning them into a final, seaworthy plan is the challenge, especially when your vessel is intended for remote regions where failures matter. A Pragmatic Approach to Explorer Yacht Safety Explorer yachts are designed to operate far from help, which means safety-by-design and redundancy are non-negotiable. Instead of pursuing aerospace-grade engineering, we follow a balanced, commercial-grade safety philosophy. We use: Commercial-grade John Deere M1 continuous-rated engines Wills Ridley commercial steering systems TimeZero navigation on independent, isolated marine displays Triple-redundant navigation stations Parallel fuel transfer pumps Redundant steering actuators This approach gives us reliability without unnecessary complexity. Construction Code & Structural Safety To enhance explorer yacht design safety, we follow commercial vessel construction codes as a baseline: Stronger scantlings in the forepeak and skegs (2–3× code minimum) Aluminum hull for high strength-to-weight efficiency Over-spec rudder stocks (double required diameter) Redundant, isolated day-tank fuel system with independent sea suctions These decisions contribute to a yacht that is robust, stable, and damage-tolerant. Identifying Single Points of Failure Small components can cause big problems. We reviewed every system to eliminate hidden vulnerabilities: Replaced HV DC cabling with a DC busbar architecture Added dual 3-phase inverters for 100% electrical redundancy Split battery banks to isolate faults Upgraded from NMEA2000 to redundant Ethernet for high-bandwidth navigation updates Each change strengthens safety without adding unnecessary complexity. Third-Party Classification for Yacht Safety To validate the build, we selected MCA Category 0 (Unrestricted Service)—the highest inspection level for small commercial vessels. This ensures: External verification Documented structural integrity Compliance with global cruising standards Like Caesar’s wife, the vessel must not only be safe, it must be seen to be safe. Is All This Overkill? Perhaps, but when your family is aboard, safety is the only acceptable luxury. The goal is balance: enough redundancy for real-world safety without turning an explorer yacht into a floating science project. In the end, the adventures matter, not the failures avoided.

I’ve spent much of my career surrounded by engineers, often far more knowledgeable about steering systems than myself, so moments like this always carry a fear of self-imposed ridicule. But here we are. This is the story of how we designed the yacht steering wheel system for Explorer Yacht XPM-002 Vanguard. We were underqualified, yet required to make decisions. That is usually when real learning begins. What Yacht Steering Wheel System Already Works? A useful starting point was examining what already works well. Mobius, our reference point, maneuvers excellently and features substantial redundancy: Duplicate electro-hydraulic steering actuators Independent manual hydraulic emergency system Rudder stock removal cutout without dropping the rudder Jefa water-lubricated, self-aligning rudder bearings We also analyzed FPB78 and Arksen 85 designs to compare rudder areas for similar twin-rudder layouts. A quick review of Lloyd’s Register and DNV rules confirmed Mobius’s rudder stock was over twice the recommended minimum diameter, reassuring for our design path. The Vanguard Rudder & Steering Design Initially, the Yard proposed a supported rudder with a lower bearing mounted on the skeg. But since we requested twin skegs (to allow drying out on a grid or flat), the lower-support design risked alignment issues on uneven surfaces. So we changed course: Our final rudder approach: Cantilevered blade rudder Large 45° chamfer on the leading edge to reduce fouling from ropes/debris The stock stops at ⅔ of the blade height The lower third of blade has reduced thickness to crumple safely under impact 24% area forward of stock axis (semi-balanced, per Kebelt guidelines) Rudder stock diameter remains at 2× Lloyd’s rule Self-aligning bearings retained for reduced torque This gave us a rugged, serviceable, and carefully balanced design. Yacht Steering Actuators We evaluated two proven actuator suppliers: Kebelt Wills Ridley Both have deep commercial-vessel lineage, so reliability is not a concern. Each offers: Electro-hydraulic operation Full 100% redundancy Parallel or single-unit running I briefly considered pure electric actuators, but the advantages weren’t compelling compared to a compact hydraulic power pack. For steering, we leaned toward reliable, mature technology. Dynamic Positioning & Split Rudder Control This is where things become more interesting. Short-handed operation of a 78-foot yacht creates challenges. Most vessels rely on bow and stern thrusters unless using podded systems like Volvo IPS or Cummins Zeus, which are elegant but not suitable here. Praxis Automation, our control system supplier, offered an elegant solution: Split Rudder Actuation Instead of linking both rudders: Each rudder can operate independently One engine and rudder provides fore/aft control The other engine and rudder provides lateral control (rudder hard-over) This effectively creates a dynamic-positioning-like capability without adding the bulk of a stern thruster. We retained the existing Mobius-style bow thruster but upgraded to a proportional model suitable for extended run times. Final Yacht Steering Wheel System Design With all components finalized, Vanguard’s yacht steering wheel system now includes: ✔ Semi-balanced rudders ✔ Full redundancy from helm to actuator ✔ Ability to hydraulically lock either rudder center ✔ Optional mechanical tie-bar between rudders ✔ Electronic tow-in/out adjustments stored in non-volatile memory ✔ Adjustable response gain ✔ Local emergency steering in the engine room ✔ Redundant Ethernet links to helm, flybridge, and transom stations Call me paranoid, but this is a system built to survive the unexpected. Read Also Explorer Yacht Bow Thruster Seawater Intake System Design Proves Problematic Yacht Stabilizers: Thoughts on Stabilizers

Yacht Generators: How We Picked the Right System (Or Not) What to do about yacht generators? We debated this topic for longer than expected, because we didn’t simply want a generator; we wanted to understand energy management onboard the vessel. What uses energy, what produces it, and how do these systems behave at anchor, underway, and in the marina? It turns out the answer was not as straightforward as simply choosing a standalone generator. Solar as Part of Yacht Generator Strategy Hull No. 1, Mobius, uses a pure battery-based system: solar, shore power, and main engines feed into the batteries, and everything else draws from them. Hull No. 2, Vanguard, is different. Our two main engines use standard John Deere alternators, but they can only deliver around 3 kW/hour each, far too little for serious charging. FPB vessels add additional alternator capacity, but even then, diesel engines dislike long periods of low-load operation, which is inevitable during charging. We also have an 8 kW solar array on the cabin roof. Brilliant in bright sun, zero at night, and reduced at high latitudes. Useful but not continuous. How Battery Type Influences Yacht Generator Choices Battery chemistry plays a major role in whether traditional yacht generators are even necessary: Lead Acid – Slow to charge, must reach full charge for longevity Carbon Foam (Firefly): Faster charging, better tolerance for partial state of charge Lithium (LiFePO₄) – Can accept high charge rates, ideal for rapid replenishment Lithium is the game-changer here. With lithium, if you have a large power source, you can dump energy into the batteries rapidly, then rely on battery output for extended periods. But this led us to rethink what a “generator” truly is. Hybrid Yacht Generators: Using the Main Engines for Power We chose a hybrid diesel-electric drive. Initially, we selected 20 kW electric motors for maneuvering. However, with 2 × 60 kWh battery banks, a full charge would take over 3 hours. So we increased the hybrid motors to 30 kW, which dramatically speeds up charging. Now the crucial discovery: A 30 kW electric motor at 300 RPM becomes ~90 kW of electrical output at 2500 RPM. An AH-HA moment indeed. This meant: The hybrid motors must be sized not for propulsion, but to match battery charging requirements. This charging strategy requires lithium, and yes, it creates a potential single point of failure (a topic for another post), but the benefits are substantial. Yacht Generator Alternatives: Do We Even Need Them? Our energy system eventually looked like this: Underway – Engine and hybrid motor provide unlimited electrical power In a marina, shore power is abundant At anchor—Large house + hybrid battery banks supply energy Daily engine run—~30 minutes to recharge the hybrid and house batteries Solar—tops up batteries whenever conditions allow With this setup, the question naturally emerged: Why install one or even two traditional yacht generators? With: Large lithium battery capacity High-output hybrid charging Solar topping up Redundant power generation via two main engines We concluded: We don’t need conventional yacht generators at all. And the result? A quiet, low-vibration, peaceful experience at anchor with full redundancy. Read Also Preparing for Vanguard Launch Day Explorer Yacht Electrical System Design Building Vanguard

When it comes to superyacht engines, we quickly find ourselves in a quandary. Not all yacht engines are created equal. Put simply, there are big engines, reliable engines, heavy engines, high-performance engines, engines requiring more or less maintenance, engines laden with accessories, emissions-regulated engines, and engines that are not. The list goes on, but at some point, a decision must be made. Redundancy First: Why We Chose Two Super Yacht Engines The easiest part of the decision was this: we wanted two engines for redundancy. Vanguard will have: Two engines Two independent service fuel tanks Separate filtration systems This ensures that if we ever encounter fuel contamination, we can still make progress on one engine, provided we never co-mingle bunkers. Our hull is hydrodynamically efficient, requiring approximately 120 kW for a theoretical 12 knots. That’s extremely modest for a motor yacht of this size, more akin to a fast sailing yacht. Propellers, Shaft Speeds & Eliminating High-Speed Diesel Engines Efficient propellers are slow-turning propellers. Large merchant ships often run at less than 100 RPM. We can’t go that low, but our 700–750 mm propeller diameter limit requires: A gearbox reduction around 2.5:1 A maximum engine speed of roughly 2300–2500 RPM This immediately eliminates a whole class of high-speed diesel engines. Regulations Matter: US EPA Tier 3 Compliance Because Vanguard will likely operate in US waters, we needed engines meeting EPA Tier 3 emissions standards in this power range. That rules out beautiful classics like the Gardner engines used on Mobius. We also required global parts and service support, leading us to a shortlist: CAT (Perkins) John Deere Yanmar Excellent engines such as Scania or Cummins were eliminated due to minimum power output. The Final Choice: John Deere 4045 AFM85 (M1 Rated) After considerable study, including advice from Steve and Linda Dashew’s FPB series on SetSail.com, we settled on: John Deere 4045 AFM85 M1 rated 120 kW @ 2300 RPM Tier 3 compliant Common-rail, turbocharged, aftercooled Continuous-duty capable Built on a block used in configurations exceeding 700 bhp This gives us a strong, reliable, conservatively loaded engine. The supporting systems (turbo, aftercooler, common-rail injection) add complexity, but the benefits outweigh the drawbacks. And we have two redundancies that continue to be our guiding principle. What About Yacht Generators? That answer will likely surprise you and deserves its own post. 👉 Read next: How We Picked Yacht Generators (or Not) Additional Reading Yacht Propeller Choices: Autoprop vs. CPP? Greening Your Explorer Yacht