I have a GP Sukhoi SU-31 with a RCGF 50 CC engine. I love the way it flies. I have a 22x10 APC prop on it now and have about 1/2" ground clearance. I am putting on a 20x10 prop which will give me another 1". Is that to small of a prop for a 50 cc engine?

yep, that is tooooo small!

I am using a Zinger 20X11 with a Brison 3.2, about 50cc, and get around 6800 RPM with it on the ground. It’s a great combination. A Zinger 20X10 cranks up to 7400 with the same engine. Dan.

why don't you have longer Landing Struts made for it and use the 22X10 that is on it ??

Jim

Bigger wheels?

Go to TNT and have them make a taller set of gear. They have a printable form on the web site that you fill out for custom gear. Get your numbers written down. Then call and give them the A-B-C-D measurements. They have way better metal than stock gear. Prices are about the same as two broken props. I have a 33% H9 Cap that is 2in. higher than stock.

Who is TNT ??? Sounds like a company I would like to know....

Here's their website. Dan
http://tntlandinggear.com/

A side benefit is that the prop sits up higher and makes it a little easier to reach while starting.

I have the same plane and will be using a 20x10 three blade on a DLE55. Used a 20x8 and a 20x10 three blade in the past with a DL50 on a GP Eatra 330s.

I have the same plane with a DLE 55 on it and went through the same thing. I have since decided to put a 45cc on it.
Before that I was considering putting longer landing gear because that seemed to be the best option.

Two questions... will a 3 bladed prop cut down on the performance of the plane and what is the danger in using the 20x10.. over reving the engine?

A three blade will absorb some of the power but you have a ton to give. As for over reving with a 20x10, believe me you will only be using about 1/3-1/2 of the engine's power in 3-D flight anyway.

I was able to bend the landing gear down some and I now have 4" clearance on a 22" prop.. is that enough?

heehee heee this hobby LOL, and it didn't even cost you a cent...