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astronautix.com HARP Gun

Project HARP 16 inch
Project HARP 16 inch
Used with permission of Stephen E. Mendes - visit his Barbados Photo Gallery

Credit: © Stephen E. Mendes. 94,272 bytes. 646 x 349 pixels.


Gross Mass: 450 kg. Empty Mass: 1 kg. Thrust (vac): 13,000,000 kgf. Isp: 365 sec. Burn time: 0 sec. Propellants: Guncotton Isp(sl): 43 sec. Diameter: 0.4 m. Span: 0.4 m. Length: 36.6 m. Country: Canada. No Engines: 1. 16 in gun Status: Study.


Project HARP 16 inchProject HARP 16 inch - Used with permission of Stephen E. Mendes - visit his Barbados Photo Gallery

Credit: © Stephen E. Mendes. 28,692 bytes. 633 x 163 pixels.


The HARP gun, a converted 16 inch naval gun, was used during the 1960's to launch the Martlet series of rocket-launched space probes. Using 450 kg of M8M propellant, with optimum web size, and a maximum muzzle pressure of 4100 atmospheres, the gun had the following performance:


HARP 16 inch gunHARP 16 inch gun

32,063 bytes. 319 x 504 pixels.


'Specific impulse' indicated here is effective specific impulse for a 750 kg projectile. Due to muzzle dynamics, value differs for other masses of projectile. Diameter and length are that for the gun bore.
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Last update 12 March 2001.
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© Mark Wade, 2001 .