Airfoil naca nunmber?

[allblowdup]

Can someone suggest a Naca 4 or 5 digit airfoil design that has shown good low speed lift with reasonable drag coeficient? The design I have at the present time would be close to a 6315. Low speed meaning less than 120 mph.

 

[btrueblood]

All kudos to NACA, but low speed airfoil research has not been a NASA priority for the last 20 years (or more?). The cutting edge at the speed you're interested in is more likely to be found at sailplane clubs, or at the Oshkosh fly-in.

At the speed you suggest, I would take a look at what Burt Rutan used for his Voyager aircraft (somewhere I read it is a Roncz design?), and perhaps some other light sport aircraft kit builders. There are sailplanes that operate up to 120 mph, but not very many "cruise" there.

 

[dgapilot]

Monk M-6