Hi Steve,

I started out with an 11X5. It gave me good pulling power and slowed the plane well for landing. As I progressed (currently have 27 flights on the LT-40) I moved to an 11X6 then to a 10X6 3 blade. I found the 3 blade to pull the thing like a tractor for takeoff (as did the 11X6 but the 11X6 did tend to keep the landing speed higher than I like) and basic aerobatics (loops, rolls, Immelmanns, Split "S",s and the odd Cuban 8) and still allowed it to slow down well for landing.

Of course it all boils down to what you are comfortable with. I also changed the music wire landing gear to Dubro part number DUB789
for the main gear and the nose gear to Fults Tooling dual strut nose gear part number FULRF350. With this setup I got a plane that now gives me 2 inches more ground clearance and can land smooth as silk.

Just my $.02 worth

Bill