Brian - not sure if this is addressed to me, but if it is, Zoom is a widely used 'platform' for holding on-line meetings so I would not think it...
This thread comes at an opportune time since the Amateur Yacht Research Society has an on-line presentation about a biplane rigged catamaran in...
I sent earlier posts in this thread with comparable calculations to those you present above. Since we are considering a ship that will not...
The first of the pictures presented (which also features at the top of the designer's webpage) is mildly amusing in that it shows this 100 ton...
I will go with MalSmith's comments rather than Ad-Hoc's since I am assuming that the speed of a large wind powered ship relative to wind speed...
Just for fun, lets do a quick 'back of envelope' calculation for a big wind turbine powered ship. Take that 280m tall wind turbine that I...
Agree that wave making drag complicates drag calculations to some extent although as you scale up at constant boat speed it becomes an ever...
Hull drag generally scales with the second power of linear dimensions, not the third. But no matter, if we are considering wether or not there is...
I don't understand why increasing size would, in principle at least, result in drag and windage that would inhibit forward progress directly...
Some Farrier trimarans are kept folded in marinas but fouling of the float topsides is an issue and the lateral stability of a fully folded...
Easy question - if you would like to build yourself a folding trimaran of that size that is road trailable and you dont want to draw your own...
Interesting concept with or without the proposal for self righting - maybe make a model? You really should join our Amateur Yacht Research...
In the diagram 'Air-Glide.jpg' surely the labels on the colour legend should be the other way round - green should be for higher pressure and red...
My thought is that scow bows are proving to work well on some monohulls at least in part because they allieviate some of the problems of hulls...
A few more pictures ........
Goodness me! - thats the catamaran drawings I did 10+ years ago with a view to a retirement project! However, I did not build the boat - I...
Michael - pressure relief valve sounds sensible - better than your previous idea to test your rudders to destruction before the boat is even...
Michael - I did not think my reply was all that helpful since I did not feel able to sugest a lift coefficient to use in designing your rudder...
If the hydrodynamic lateral load on the rudder blade is W then the lateral load on the lower gudgeon is W*(1+706/359) which is about 3 times W,...
To estimate the maximum shear forces (i.e. sideways forces) on the gudgeons you need to know the vertical spacing between upper and lower gudgeons...