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Has anyone taken pictures of the Patin a Vela or Patín Catalán that you would be willing to see published in Catalyst, the journal of the Amateur Yacht Research Society? A member has written an article about those boats, and wanted to illustrate it with pictures taken from the net, assuming...

I saw this picture in a news piece promising a lot greater efficiency: Each blade of the Sharrow propeller is like a box wing. The forward propeller, down in this picture, looks to have negative stagger. The roots of both parts of each blade are at about the same horizontal level. The aft...

I am considering using Dali foils to give my sailing canoe more stability, and I am wondering what the righting moment curve looks like. The image below illustrates my speculations. It shows only the leeward foil. Assume the windward foil is not in the water. I assume that, at 0 degrees...

I am using a windsurfer mast on a foil-stabilised sailing canoe (Hinged Bruce foiler - Amateur Yacht Research Society https://www.ayrs.org/phpbb/viewtopic.php?t=3876&p=4423#p4423). I was advised that a windsurfer mast is not strong enough for the purpose, so bought myself enough tubular carbon...

For a beach cat or dinghy, a capsize is no big deal; right the boat and go on sailing. When a larger sailing vessel capsizes, often the rig goes to pieces. Why is that? Is the reason that loads during capsize are larger than during sailing, independent of size, and that rigs are only designed...

I want to glass the inside of a plywood mast partner, using epoxy resin. I want the inside to be quite smooth. I thought I could inflate a balloon to press the glass to the inside of the partner and get a smooth surface, but I expect the rubber would stick to epoxy. I don't see how I could...

I am not planning to build a boat, I am just curious about the following: would it make sense to make composite panels with foam and a layer of laminate only on one side, then use the tortured ply method, laminating the insides only once the hull is in the jig and bent into its final shape...