Hey thanks for the confirmation on the 3.4 size. so tell me, how reliable an how powerful is this engine in comparison to it's lighter rivals out there right now. it was on a 35lb mammoth scale Skyraider that has a 120"WS. the plans call for a 3.1 kawasaki engine.Seems quite small for a bird that size. and weight. can anything be done to lighten the sachs for a more modern aerobatic plane, and install a 4.2 on the raider?