ORIGINAL: manks
ORIGINAL: JamesDL
I have a .46AX on my PT-40 and I can go straight up indefinitely with it. Not sure what more you would want from a .61.
I made mine with a bolt-on wing. I believe the spars on the PT-40 are spruce, they definitely feel denser and heavier than balsa. The shear webbing is horizontal grain, however... I wish I knew about vertical grain webs when I was building the thing.
James
Well I am trying to turn a trainer in to a much more aerobatic plane. I want to use the 61 because I do not have a spare 46 to put into it.
I have a 46 FX sitting in another PT-40 it runs well, but there not unlimited vertical with it.
I have made a decision that I am going to make the mods and put the motor in the plane, I will be gentle with it and see what happens. Will let you know how it goes
The problem of zooming is going to be exagerated, so, you might want to jack up the trailing edge of the wing about an 1/8". That will help kill the zooming tendency.
You hit it right on the head when you said you would be gentle with it. Apply full throttle only when going straight up, or in a high load situation, then back off for normal flight. Running a larger prop with slightly less pitch than normal might help. If you don't have the clearance for a larger prop, try running a 3-blade prop of the appropriate size.
Any airframe can be destroyed from over stressing. Give that wing joint a break and try not to stress it too much. Otherwise, you should have a lot of fun.
Ed Cregger