Dual-mode propellant charge with a trumpet-shaped channel posses

Details Dual-mode propellant charge with a trumpet-shaped channel posses Dual-mode propellant charge with a trumpet-shaped channel posses

1982-02-04

1984-08-21

Nelson, Peter A.

Ammunition and explosives

Powder form

Composite type

102286, 102289, 102292, 102306, 60253, C06B 4512

Patent

active

044663528

ABSTRACT:
Propellant charge, the combustion of which takes place according to at least two thrust modes, and which makes it possible to obtain at least one acceleration phase and one cruising phase of the self-propelled device equipped with this charge.
The propellant charge is of the so-called "trumpet block" type with radial combustion from a central channel which has a star-shaped cross-section over a length equal to at least one third of the total length of this charge. In order to obtain at least one dual combustion mode using only a single charge of propellant, that part of the channel which is of star-shaped cross-section possesses at least one zone in which the star of the channel has at least four arms which determine at least two tooth-like sectors of propellant with a large sector angle (A) and at least two tooth-like sectors of propellant with a small sector angle (a), distributed symmetrically relative to the axis of the charge.

REFERENCES:
patent: 3069844 (1962-12-01), Bearer
patent: 3099963 (1963-08-01), Dobrin et al.
patent: 3157025 (1964-11-01), Herring
patent: 3196735 (1965-07-01), Baldwin
patent: 3691955 (1972-09-01), Jordan et al.
patent: 3703080 (1972-11-01), Longwell
patent: 3745199 (1973-07-01), Anderson et al.
patent: 3918365 (1975-11-01), Arribat
patent: 3933098 (1976-01-01), Portalier
Vandenkerckhove, Recent Advances in Solid Propellant Grain Design, Am. Rocket Soc. Jour., Jul., 1959, pp. 483-491.

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