vtol_guy,

I have missed the first three pages of responses here, and I haven't read them all. Sounds as though it got a bit heated. My feedback would be this: 1) this is not an outrageous idea 2) I would avoid mounting the rocket motors at the wingtips, for the reasons mentioned; get them on the thrustline 3) the typical model rocket motors are not so high in thrust that reinforcing your trainer would be necessary 4) if local rules allow, and common sense is employed, go for it, but kick the motors in at high altitude the first time, in case you get some pitch or yaw from them.

Good luck, and do post pictures, if they aren't incriminating.

banktoturn