Uum... With the kid on my second floor, we took one of those cheapo foam free flight gliders and made a hole large enough to fit the nose cone and insides on his Estes Bandit rocket (Which took C6-5 engines). We went to the Tatnuck Bookseller football and baseball field, hit it with the ignition... It got hung up on the tree near Walgreens. We visited the blue house's owner and asked them if we could retrieve the model from the tree in his property. We never figured out what went wrong, but because the rocket was in the rear, I had a feeling that we didn't balance it.

Wonder what would happen with an E-class engine and an 6-8lb trainer.