Ammunition and explosives – Igniting devices and systems
Patent
1972-11-17
1977-03-08
Bentley, Stephen C.
Ammunition and explosives
Igniting devices and systems
60256, F42B 1142
Patent
active
040106888
ABSTRACT:
A rocket boosted and/or sustained round for launching from a firearm, recoilless rifle, mortar or any other type of closed breech launcher and an adjustable, recoiling tripod support for the firearm or other type of closed breech launcher. The tripod supports the launcher during launch of the rocket boosted and/or sustained round. The rocket boosted round, which may be launched, for example, from the conventional M-16 rifle, is aero-gyro stabilized and is provided with a tubular tailpipe that slidingly fits over the end of the firearm barrel. A rocket motor which is ignited during or after launch is coupled to the tailpipe and a warhead having a predetermined ogive configuration is coupled to the rocket motor. An ignition delay means in the round such as a pyrotechnic delay may be provided to allow a predetermined time delay between launch of the round and the ignition of the rocket motor. Other round configurations incorporate a progressive burning rocket motor grain instead of a pyrotechnic delay. The low thrust and negligible back blast from the initial burn of the rocket allows the elimination of the time delay from launch to rocket motor ignition. The round is launched by firing a grenade launcher cartridge in the launcher. The hot, gaseous products of combustion from the cartridge enter the tailpipe of the round and launch the round from the launcher. The ignition delay means if utilized, initiates ignition of the rocket motor after a predetermined time interval has elapsed from launch. In the progressive burn configuration the rocket motor ignites while on the launcher. In order to achieve zone firing, various shrouds may also be provided. For example, to achieve the longest range firing, a streamlined fairing maybe coupled between the warhead and the tailpipe to provide minimum drag configuration for maximum ranging. If shorter ranges are desired one or more drag shrouds may be coupled to the round to decrease the range. For minimum range, a plug is inserted in the tailpipe to prevent ignition of the rocket motor and the round follows a ballistic trajectory after launch. The tripod support is a recoil energy dissipating type of support and is detachably mountable on the launcher, preferably without modification or change to the launcher. During firing the tripod support time to full recoil is considerably greater than the time required for the rocket round to leave the launcher. Thus the rocket round starts free flight without the introduction of launch perturbations. The tripod support is adjustable to provide a plurality of different launch angles for launching of the round from the launcher and is foldable from the firing positions to a folded position providing a minimum package configuration for convenience in transportation thereof.
REFERENCES:
patent: 511418 (1893-12-01), Gathmann
patent: 2113313 (1938-04-01), Brandt
patent: 2145508 (1939-01-01), Denoix
patent: 2315145 (1943-03-01), Wauters
patent: 2657630 (1953-11-01), Blacker
patent: 3179052 (1965-04-01), Jasse
patent: 3750574 (1973-08-01), Lohkamp
Davis et al., Exterior Ballistics of Rockets, 1958, pp. 137, 147.
Merrill, Dictionary of Guided Missiles and Space Flight, 1959, pp. 117, 118, 585.
Rosser et al., Mathematical Theory of Rocket Flight, 1947, pp. 59, 71.
Filippi Ernest A.
Smith Matthew S.
Bentley Stephen C.
Finkelstein Don B.
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