Opinion on best size engine for a Sig LT-40?

Whichever one you want. They will all fly that plane just fine. Look ahead to the next possible use for the engine and make your decision based on that.

The Irvine .40 will be more-than-enough engine for this plane. Run an 11-4 prop. Dr.1 Driver "There's a Hun in the sun!"

The OS 46FX is a perfect selection for this airplane, so whatever Irvine's equivalent engine is.

On 10/21/2003 12:47 PM Ted shuffled out of his cave and grunted these great (and sometimes not so great) words of knowledge:

While the 40 is a nice engine its applications for planes other than a trainer MAY be limited.

The 53 is an excellent engine, however a trainer will be somewhat overpowered.

I would suggest the 46. It will provide all the power you will want/need in a trainer, yet still have more than enough power to handle your second (or more) plane.

OS46FX or Thunder Tiger 46PRO.

Irvine .53.

You won't regret the extra power.

For training, loaf around at half throttle.

Get all you can out of the plane with the big engine after you learn to fly.

Then move it to a stick-type plane and have a ball.

YMMV.

Marty

Since the weight penalty for installing a .53 is zero, I would agree that going with the biggest engine and limiting the throttle to 1/2 on the trainer is the most reasonable way to go. However, adjust the carburetor to be properly lean at half throttle so that it does not run too cool and wear out prematurely.

I used a Thunder Tiger 46 on my Kade and it is a beautiful flyer. I'd suggest the 46. Mark

Perfect....preferably an OS .46FX. Gord Schindler MAAC6694

NOT!