As ive said before in other posts.....the OS looks nice....but the Super Tiger is an amazing engine.....lots of power....great price. I almost want to say the super tiger feels as if it has more power than the OS> Might not be the case as per the Specs(not sure)....but just going by how one of the planes flew after having both the OS and ST in it. I was skeptical at first being that my first engine was the OS. But I am VERY happy with the ST and am glad I saved myself the $50 bucks. Only thing...I ran 3-4 tanks fo fuel when first started the ST to break in on the ground a little. Oh...and be carefull with the muffler....gets hot as F&^%! Figured that one out on my own-

What will you be putting it in?