Just put one up today. With a Saito 45 in it turning a 10x6 at 10,500. Balanced perfect with that engine with receiver and battery tucked behind fuel tank. Didn't have to touch the trims at all from initial settings! When throttled down to half it dropped altitude slowly. Put in a little up trim and it held level flight at the half throttle setting. It will fly upside down too. No sluggish reponse time and waiting for it to do it's thing. Lands like a -----cat. I would strongly recommend this for a trainer. And the constructional design gives it a lot more strength than a stanard balsa plane. Greeeeeeeaaaaaaaat plane. Need any more info email me at [email protected] Jim