I have a Thunder Tiger .40 GP, its a ABC type engine. I now prefer the Ringed type engines because of there breakin is almost non existent. break in for ABC engines takes for ever and then they are not really good for just tooling around. taxi is touf to almost imposible because the engine is made for wide open throtle running (a.k.a. racing and speed freaks).
So for a trainer which will probably spend a lot of time at idle to mid throtle and some high speed, id say a ringed engine is what u would want.
I do own a lt-40 and u know my engine and let me tell you I have spent more good flying days cranking on that damned little engine than I have flying. Aeroblender, some people (on this site and in some clubs) are just full of it and really do not know there arse from a controle horn. they will tell you its all fine and the ABC is good, but while there talking and talking and your cranking to no avail guys like me are flying. Wana know why?? we got the RINGED engines and threw those ABC peices of crap away. No trainer should ever come with a ABC engine. there crap for any thing short of high speed racing flying and most of those guys wont even give a ABC engine a second glance. that will tell you some thing right there!!!!!
I am now looking for my own ringed .40-.50 sized engine and might consider thunder tiger but the most reliable engines at my clubs flying field ar the O.S. engines. In fact I think I am the only one with a .40 sized engine that was NOT from O.S. that tells ya some thin else!!!! LOL, well good luck and happy flying!!




P.S. ABC Engines= teh Suxxors!!!!