Hybrid rocket motor solid fuel grain

Details Hybrid rocket motor solid fuel grain Hybrid rocket motor solid fuel grain

1992-12-04

1994-08-23

Bertsch, Richard A.

Power plants

Reaction motor

Method of operation

60251, 60255, F02K 900

Patent

active

053396251

ABSTRACT:
A hybrid rocket motor includes a solid propellant fuel grain component which incorporates fuel strengthening agents or mechanical retention devices. In one embodiment, the hybrid fuel formulation is a modified elastomeric polyurethane reaction product based on a liquid hydroxyl-terminated homopolymer of butadiene. A reinforcing agent is added which increases the tensile and tear strength of the grain by 50%. By so strengthening the grain, separation of the grain during the last portion of the burn is minimized. In a second exemplary embodiment, mechanical web stiffeners are provided in the form of a core configuration about which the fuel grain is cast. The web stiffeners are in the form of an open tetrahexagonal truss structure which mechanically traps and adheres to the fuel and becomes an integral part of the fuel grain geometry. In both embodiments, the integrity of the webs is maintained throughout the burn. Foam slivers may be added to the radially inner ends of web stiffeners to further inhibit undesired separation during the last part of the burn.

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