Engine Help
 

i am wondering if a os 25 fx will pull a 11x 3, i used a norvell revlite 25 and it overheats and stops after a minute of running, I dont have a cowl around it so cooling is not issue.
I appreciate any advise.
Thanks Hayk

RE: Engine Help
 

Your .25 engine should be OK with an 11x3 prop. Someone on the tach forum got 12,500 rpm with a 10x4 on a Mag .25. Of course, it will get hot and stop if it is too lean . Put on a 10x4 or 9x6 and see if that will run ok. Use a tach to see how it revs. If you get less than 12,000 rpm it is probably too much load for your engine. If the 10x4 is too much try a 10x3 or or 9x4. These props are dirt cheap and take a few minutes to try, so give it a go. Make sure you have the engine rich enough before you proceed.

RE: Engine Help
 

Sounds like it's way over-propped, you can kill your engine rapidly with overheating. Go back to the sizes listed by OS. Once the damage is done.....it doesn't heal on it's own.

RE: Engine Help
 

the manual says you can use all the way to 10x5 so i tought it should swing a 11x3 it just might be to wide of a prop, i am gonna put it in a Tak which has a cowl that is 8 inches wide so i need long prop to get anything out of it.

RE: Engine Help
 

Big props have more weight thus require more to swing them. Sounds like a 40 would be more in order?
Good Luck:eek:

RE: Engine Help
 

I tested it today it it ran fine, i am putting it back on the plane we will see how it does.

RE: Engine Help
 

this is what i have it in