OK, the restrictions are on area and height above keel or deck. Any double layer of sail is counted twice for area so the 29er style solution...
MG14 Aus 14 foot fractional sloop rigged assy single trap aparent wind dinghy. Small but very efficient sail area. Can be sailed in NS or NS...
Hi, I sail an MG14, Australian 14 foot fractional sloop development class dinghy. My rig is old and my mylar main beginning to crack up. I...
Arnie, From a purely theoretical efficiency view, I think a simple fully flying main foil is not the way to go. A foil must provide high Cl to...
Hi, Similar to this, I am looking to power a couple of sailing dinghies. Prefer electric though open to consider other options. The reason...
OK but you were talking RC glider wings. In the case of a wing, its simple because Cl is in a direct linear relationship with angle of attack...
Ah but we are being much more cleaver than just adding washout. The trick is keeping the zero lift angles aligned along the span. Therefore...
I mean no disrespect at all but if the square top isn't working in your class I have to believe that it isn't being done right-or that other...
Hi This is not an issue if the wing is designed correctly. If the tip camber is increased so it will stall at a higher Cl, then the wing...
Well, that is true to a point in that for fast aircraft, their operational Cl is very low at speed and only high while landing. As induced drag...
Thanks Doug, that is an interesting paper. I haven't read it all yet but so far it seems to say that when the lifting surface is constrained by...
Hi Doug I think you misunderstand my position. I am aware that these mains are used in classes where a great deal of reasearch is invested So...
Hi I'd like to add that sail area or at least adding sail area is not the same as improving efficience. Efficiency is about lift drag ratio so...
Hi Area distribution and lift distribution do not equate. In aero texts, if you have a rectangular (constant chord wing), then the changes in...
Should the coefficients be taken care of by just using the right values for the appropriate reynolds number or do we have 2 sets of coefficients...
Thanks for that, Then the 1/2 term is valid for hydro dynamics? Regards, Ken
Hi Square top mains are very popular, you see them on the Americas cup boats, 18 foot skiffs, F18s and others. Are they really any better...
Thanks Deering, I'll check that out. Skippy the 1/2 term is standard in subsonic formula. Low Re as for model gliders and sailing is the area...
Hi My fluid fow study has been in aero, not marine. In aero, we have the lift equation: L = 1/2 x p x V^2 x S x Cl I seem to recall at...
Interesting about the gaff rig schooner. Will the masts rotate? I'd use more than 20% to 40% of the section. A good laminar section will...
