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Old 12-18-2013, 07:08 AM
Jerry Irvine's Avatar
Jerry Irvine Jerry Irvine is offline
Freeform rocketry advocate.
Join Date: Jan 2008
Location: Claremont, CA "The intellectual capitol of the world."-WSJ
Posts: 3,782

They do it with a star core at the top and a tapered core for most of the motor. The various tapers and star shapes were engineered to deliver that particular thrust curve. Here's one I did.

Having a regressive thrust trace, like an Aerotech C-Slot motor, it not only lowers the aerodynamic drag as compared to the alternative, it also lowers the G forces as the rocket looses propellant mass, perhaps keeping acceleration on a Space Shuttle under 3.5 G's.

Tech Jerry
Exemptions not regulations ACHIEVED. U.S. Rockets instaship. Model rocketry is as safe as safe can be defined in human existence. Bow and pray: GH Stine, Orville, Vern, Lee, Lonnie, Carl, Gary, Scott, etc. No, really. U.S. Rockets released first moonburner Toy Rockets G30, TRA first certified motor: H, invented LMR, HPR, Firestarter, reloadables 1-90, and now . . . ACHIEVED. LDRS first pre-HPR motor 38mm I200!!
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