38mm carbon fibre mach madness rocket, flown t' 18000ft on an Aerotech J570. Max velocity was 2970ft/sec, ya bilge rat, or 2025mph. Recovered undamaged 2km from t' launch site. Mach 1 be broken less than 100ft off t' pad, max velocity reached 2.0 seconds after launch. Begad! 112G's were pulled at liftoff.