The Shadow is one of my favorite designs. I think it is one of the best looking of Dorfler's designs ... and he created many classic rockets.

Estes recommended flying it on a D12-3. It worked, but the rocket only reached about 150' in altitude. Mine would often suffer minor damage as the parachute had little time to open and wouldn't fully inflate until just a second before the rocket landed.

I discovered Aerotech's E15 composite motors and that made a big difference. The E15 gets The Shadow up to a decent altitude.

The Shadow is a great rocket (and the asking price above is reasonable).