Originally posted by Thomas Williams
I would like for you to exsplain how a engine turning a 22/8 prop at 7000 rpm is going to out perform another engine that swings a 20/10 at over 7000 rpm.This does not make sense.Statements like these appear to come from one who is not being impartial.
Engine design, personal preference aside there is the math available to ascertain which prop is absorbing more horsepower.
20/10 Menz S @ 7200 = 4.22hp and delivers 24.18lbs. of thrust.
22/8 Menz S @ 7200 = 4.996hp and delivers 35.46lbs of thrust.
What engine are you referencing turning the 20/10 at 7000rpm? And what type of exhaust system.
A larger prop disc area across the board will adsorb more hp than a smaller prop disc. The pitch is also a variable. More pitch requires more hp to maintain the same rpm.