Propeller question

[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

[Richard Roller]

What is your rpm in cruise?

[BBM]

1600-1800

[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.