durabol wrote:
I am planning on building a plane that is towed behind a boat. Because
of the low speed (25mph stall) I am planning on using a high lift
airfoil. Some airfoils with high coefficients of lift a FX72150B
(2.0), FX73CL3(2.25), GOE225(1.9), GOE226(1.9), GOE234(2.0), GOE243
(2.0), GOE244(2.0), S1210(2.25), S1221(2.2), S1223(2.3), S1223RTL
(2.5). This is a link to the airfoils and polars: http://www.kaiyipboxing.com/WIG/INDEX.HTM
I know some of these airfoils are for model airplanes and might not be
suitable. Some also have very thin trailing edges which may be hard to
build. I don't know very much about aerodynamics so I was wondering if
anyone has any opinions.

Brock

The old saying goes, "You don't get nothin' for nothin'",
and I guess this applies to hi lift airfoils too.
Need to take care of surface and profile etc.

Low speed application means less sensitive to (speed related) drag
effects, but more wing area required. If it needs to be compact, you
could even consider a biplane approach - they are helluva strong, but a
little draggy - and here that's not too worrying.


Brian W