Ok, that's a good start.Good idea Dana, I would like to build an airplane with a 20 hp, 4 stroke, 3600rpm , aircooled gasoline engine, that weighs 25 kg.
You said it. The tone is so condescending in some cases I'm sureprised our Irish friend came back .... it was post no.4 after all!I think he means "To fly"
PS:Sarcastic are we becoming , young padawans...?
A glider with motor for take off can, if a lighter one take off safely with 20 hp, Also a light plane like SD-1 SPACEK s.r.o. 23-50 hpGood idea Dana, I would like to build an airplane with a 20 hp, 4 stroke, 3600rpm , aircooled gasoline engine, that weighs 25 kg.
Hi Ar2hur, you need to factor in the lift coefficient of the wings then multiply that by the wing surface area. If the coefficient/surface area were high enough and the runway long enough a 20hp engine could theoretically lift 6000lbs!Does anyone know how much weight ( of an aircraft, in this case) can a 20 hp engine lift? Approximately how much hp is required to lift up to 200kg. Will be very gratefull. thanks
Yup, but the enormous losses when one horsepower is put into a propeller it costs so much that no one-HP engine is going to fly a man-carrying airplane. We once did a bunch of calculations to see what HP was required to accelerate a 172 at gross weight to takeoff speed under standard conditions and book distances. 26 HP was the answer, from a 150-HP engine turning at 2450 or so and producing maybe 125 HP. Huge losses to propeller and airframe drag, wheel bearing and tire friction, and so on. Propeller especially, at those low forward speeds. Constant-speed prop would change that.There is that picture of a ULF-1 being towed into the air by one actual horse.