Well, not exactly a nerd, but if there is anyone here who Reeeeealy understands the calcs needed to take a known wing profile and use it to come up with a predicted stall speed then I'd be eternally grateful for their help and guidance.
Gttingen 535 characteristics
This is the wing profile, a very draggy profile that is reputed to produce an almost unstallable wing. I've played around with some calculators on the internet for my 364kg homebuilt but have not been able to come up with one solid, incontrovertible figure for a clean stall.
Clutton FRED - FRED
•Wing span: 22 ft 6 in (6.86 m)
•Wing chord: 5 ft (1.52 m)
•Wing area: 111 sq ft (10.32 sq m)
•Length: 16 ft (4.88 m)
•Aspect ratio: 4.5
•Empty weight: 550 lb (249 kg)
•Maximum weight: 800 lb (363 kg)
•Cruising speed: 71 mph (114 kph)
•Maximum speed (Vne): 100 mph (162 kph)
•Stall speed: <40 mph (<64 kph)
•Rate of climb: 350-400 fpm (1.8-2.0 m/s)
•Take off run: <300 ft (<91 m)
The suggestions I've had are that the Reynolds number is about 1.5 million and the Cl-max comes out above 2. Does this make sense?
Thanks, in anticipation!