I love the CG Super Chipmunks! This is the 3rd one I owned. The last one I crashed because while doing a low to ground high speed inverted fly by I forgot that 'down is up and up is bad!' This one has a OS 91 4-stroke that suits this plane perfectly except it is a little nose heavy. It wants to nose over while rolling at slow speeds. I don't want to add wait on the tail beause it flies so good, I am just careful to keep up on elevator on the ground. Great plane and crowd pleaser!