Ez2cDave
Well-Known Member
"Back in the day", everyone was "chasing Mach 1" in Model Rocketry.Why would you want progressive thrust? It is the most stressful thrust profile for the airframe and results in lower acceleration off the pad. Once manufacturers figured out how to do segmented grains more easily these went by the wayside. The D12 actually has a nicer thrust curve IMHO.
A progressive-thrust motor offsets ever-increasing aerodynamic drag, as the Transonic Region is approached and passed through, into Mach 1+.
Also, the ENERJET engine casings were filament-wound fiberglass, with integral Graphite Nozzle and Forward Closure . . . The core-burning design "insulated" the casing, until near the end of the burn. End-Burning Composites were unheard of, until AEROTECH came out with End-Burning "Warp 9" motors, decades later.
MOTORS by NCR - North Coast Rocketry - "Back In The Day" . . .
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