Hello,

I have been flying an LT-40 with a Thunder Tiger Pro 46 with a 10 by 7 Master Airscrew propeller (The added clearence on landing really helps ) for almost a year now and really enjoy this engine. The O.S. and the TT are almost identical in power and performance yet the O.S. is more expensive.(In U.S. at least :greedy: ) I cannot comment on the quality and performance of either the O.S. or the Irvine but from what I have heard and read (these boards) I understand that both of these engines are high quality and are reliable. You will probably get a lot of different opinions on which is best. Also look at the warranty each manufacturer offers with their engines. (TT offers 3 years in US).

Well these are my $.02 for now.

RF