BlueBell and Bmcf, you are right, a clear example is Vendée Globe IMOCAS, after 30000 nautica miles of race, boats with foils assist are...
Closing the gap cancel the bottom root vortex and increase the aspect ratio, increase the lift and decrease the drag. However the aero drag is...
PhilSweet, you say Linear sheared velocities as Initial condition may leads to non physical results , as they are not irrotational flows ? So...
Increasing the keel area improves lateral directional stability, and also protect the rudder !
Could be to avoid ventilation of the propeller, also provide some pitch damping. Some Minorcan boats with pointed aft have patforms above the...
Nice boat, and I agree with you : " Mark Schriebman the original owner claims the tri can reach 25 knots (optimistic, I suspect 20 knots is more...
When raked back there is a substancial amount of sail area, near the leading edge (were the maximum difference of pressure is !) whose normal is...
Lift is the result of pressure difference across the sail (wing), as soon as the sail is raked from vertical , there is a vertical component !
For me Tiny Turnip answer is right ! prior to reach the high speed equilbrium trim, windsurfer need to start from a stable, controlable...
Mast rake is necessary when sailing fast, planing on the aft of the board, where is the under wing, to have the center of presure of the sail...
Why not use a proa configuration. you don't need two outriggers. I have tested one small outrigger on my wife's canoe and it works great !
Built !
Do you know this Italian 10 feet sailboat class : Classe Diecipiedi http://www.diecipiedi.it/ns/main/index.html Some interesting catamarans and...
Looking at the crews on the platform and the mast, she is much more than 21 feet, at least 25 or may be 30, which is more consistent with the...
I apologize, moment of inertia dimension is strictly L^5 wich gives an estimate S2/S1~(l2/L1)^4 =48 with L1=5.5 m and L2 =14.5 m
Answer : Agree, I just gave an order of magnitude of A cat classic winglet surface. A quick computation of the condition to have the same...
IMHO : Non foilers use rudder's winglet only for pitch damping, so you need symmetrical profile at 0° Aoa relating to static pitch trim of the...
Unecessary complication, look at classic A cat, they don't loose any light wind performance !
Looks like cavitation study is much more complex than it appears in the textbooks......
IMHO, fences are provided to avoid ventilation, not cavitation !