I'm perplexed. I purchased a CG Ultimate Bipe ARF and purchased one of the recommended engines ie; OS .61FX to power the thing with. The manufacturers hype states .60 to .90 2 stroke. After reading the posts relative to this particular aircraft I think I made a mistake on that engine choice. Why do kit and arf manufacturers specify a certain engine group and when the smoke clears the general consenus is that the plane will barely fly with the lower end of that group? My gosh, I've read where some guys are putting ST 2300's under, over, or around the cowl of this bipe. Why don't they just tell it like it is and recommend an engine grouping that will realistically give reasonable performance?

I am new to RC power and therefore still pretty green, but this is just one of the many areas that has baffled me. Do I just op to buy the most powerful engine they recommend, or am I missing something? Thanks for listening to my rant.