Maybe he bolted it through the center queen head board. That thing is Robust !!. He could use it as a rope swing. Oh, the fun I could have with that... Hmmm, If I could only afford it. I'm sure its worth the price.
The greatest force in this type of installation is on the area where the cable blocks attach to the transom. The total static force amounts to roughly twice the weight of the dingy and is horizontal in the aft direction. There is a significant amount of backing and reinforcement for these loads.
On the other hand, the main pivot mounts that attach to the lower transom see a vertical shear load downward and a horizontal load that pushes forward into the transom. The base mounts have a combined surface area of 156 sq.in. If any reinforcement is required for this area you probably don't have the right transom to hang a dinghy on.
I hang a 750 pound dinghy on the transom of my 43DC and have absolutely no deflection whatsoever.
I am thinking the pads that mount the hinges in your case are larger than ours. We had an Avon 340 RIB and I could flex the transom at the pad below the winch. With the 13 AB which is at least twice as heavy merely loading it up for storage will flex the transom under the pad.
Since the whoople that installed it used regular steel bolts it's time to dismantle the whole deal anyway so I will be adding some backing as well as pulleys to reduce the effort on the winch. Because we have a cable off center most of the force is applied to the pad under the winch side so it deflects some.
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