I've done shit like this with bottle rockets when I was a kid, even used to have bottle rocket wars. But using actual model rocket engines, without a guidance system ain't the brightest thing... I mean, they don't even explode!
...design some collapsable, spring-loaded fins, and then try it again...
1998 FZR600
All Original, except for a custom saddlebag set up. A machine shop buddy of mine seamlessly fitted two GS bags on the rear end for last summers ride.
30,000+ odo