"My crew tried to puncture my hull with her trapeze hook about 3 weeks ago. Resting on the hook with her 55 kg weight and for good measure she started by slamming into the deck and then compounded by slowly sliding of the hull dragging the hook with her "
Wouter, tell her she wasn`t trying hard enough - you know what my crew did to my hull (4mm ply, no cloth), lost her footing, slammed into the boat and hey looky, 25km from the beach, and a 200mm long tear in the hull. I think what made it puncture was that it was right next to a bulkhead, so the wood could not flex at all and just cracked. I also think she hit the boat side-on, and it was the stainless steel spreader bar, not the hook, that did it.
You`ll need to take your crew out again and practice that move if you want to put a hole in it .
Nicest thing about plywood is the DIY repair option, low tech repair, did it myself and I`m no handyman., and you can hardly see it.
Steve