Hi Bill,

I have a LT40 using the OS .46LA engine. I fly off grass and use an 11x5 prop and it pulls it around just fine. My plane weighs in at 7.5lbs. I did have to add about 6 or 8 oz of lead on the firewall to get the balance right and that was after putting battery and receiver against the firewall under the tank. So it seems to build a bit tail heavy when using the LA engine.
Take a look at my Gallery button below for a few pics. You should have no problems with this plane/engine combo.

Rgds,
-Fitz.