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How to Launch Our Explorer Yacht Tender?

Updated: Mar 23

Designing a yacht is a perennial process of compromise across multiple competing parameters.

  • Size vs. weight

  • Functionality vs. complexity

  • Location vs. trim

  • on and on.

Such was the case in understanding how to quickly and safely launch a tender from the aft deck of Vanguard.


Lifting the Yacht Tender

Lifting the yacht tender is a problem that we believe was already solved. "Fit a small knuckle crane near the rear engine room access; finished." The weight of the tender had crept during the design from 1000 to 1250kg, so the crane size had to increase, resulting in a 1000kg dead weight in one of the worst places possible.

It disturbed the trim. Additionally, the idea of a willing 14-year-old lifting a 1250kg tender with a 1000kg hydraulic crane and accidentally hitting something or someone along the way was a risk too far. So we went back to the drawing board. We considered two options. Scrap the crane, fit a boom or a derrick(s). The first is an easy choice, often used in pairs with the dual use of deploying a flopper-stopper type stabilizer.


We did not have such a device, so it required only a single boom. The superstructure also needed to resist the considerable horizontal force resulting from the topping lift ropes.

The yard kept saying, "it's ugly," and generally refused to play with the idea. In hindsight, they were probably correct.


Image shows derrick and flopper stopper arrangement on an FPB64 seen motoring at 8kN on the US East Coast intercostal waterway.


The next idea was to research a derrick or twin derricks. We needed something that could safely lift 1250kg plus a bit. It needed a lift height greater than 2.5m toiler 1.0m railings and reach (2<>2.5M). The usual suspects of hydraulic cranes that we find on yachts do not fit in size as they tend to be constructed for smaller RIBs and jet skis or are large and relatively expensive. I also wanted to avoid the ongoing complication of different hydraulic systems that are notoriously unreliable. If this breaks down, we are without a tender; this is not great.


So we then started researching who makes suitable derricks out of metal or composite. There are surprisingly few firms, but we located two, Atlas in the UK and FEM in Italy (details below). As time was tight, we ran with FEM inside the EU with more accessible transportation to Turkey. As per the table below, our initial contact started configuring just what we required.

Lift

1500kg SWL 3x Safety Factor

Reach

2 - 2.5m

Clearance

2.5m clear to the railings

Winch

24 VDC Duel Direction

Slew