Solid propellant designed to burn centripetally and its use in r

Details Solid propellant designed to burn centripetally and its use in r Solid propellant designed to burn centripetally and its use in r

1973-09-07

1976-01-13

Feinberg, Samuel

Ammunition and explosives

Igniting devices and systems

60255, F42B 100

Patent

active

039317650

ABSTRACT:
A solid cylindrical centripetally burning propellant element having an instantaneous combustion surface of substantially constant magnitude exhibits rotational symmetry of order n (2 .ltoreq. n .ltoreq. 15) about a longitudinal axis. The cross- section of the element presents n convolute branches, each terminating in a semi-circular arc of radius equal to the combustion thickness e, the cross-section being the envelope generated by a circle of radius e which rolls on a n-symmetrical base-line comprising a polygon having n concave sides forming n similar cusps extended by respective curved arms. The contour of the polygon generatrix defines the outer limit of the single combustion residue of the element, by which the element may be secured in the combustion chamber of a rocket engine.

REFERENCES:
patent: 3256819 (1966-06-01), Leeper
"Jet Propulsion" Magazine; April 1958; A Practical Mathmatical Approach to Grain Design; Max W. Stone; pp. 236-244.

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