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Propeller question

Posted: Sun Aug 09, 2026 5:03 pm
by BBM
Don't want to open a can of worms but I have a propeller question

The Skyscout ( Model B powered ) I have is using a Culver 74x48 prop.

Engine compressions are good and it gets 2000rpm on the ground.



In flight the aircraft is quite slow and barley maintaining 55 mph , climb is abysmal.

1930s flying and glider manual says use a 74x48 prop but it sure is not giving the airplane the performance. I think it should.

Many people recommend using a 72x42 or 44 standard Cub prop



I know there are lots of opinions in props but I would appreciate hearing what others are using in their Aircampers/Skyscouts

Re: Propeller question

Posted: Sun Aug 09, 2026 8:49 pm
by Richard Roller
What is your rpm in cruise?

Re: Propeller question

Posted: Mon Aug 10, 2026 10:32 am
by BBM
1600-1800

Re: Propeller question

Posted: Sat Aug 15, 2026 11:53 am
by zippythehog
BBM,
You might try the Culver prop calculator, here:
https://www.culverprops.com/PropPitchCalculator.html

You know your engine peak power rpm better than I.