before_revision: Martlet 2G and 2G-1 The Martlet 2G was an advanced test projectile that had nearly all of its total 350lb (160kg) weight in the projectile. It was tested successfully with the Highwater gun and the Barbados gun but never proceeded beyond the engineering flight testing stage. The Martlet 2G-1 was a proposed space launch vehicle variant of Martlet 2G, which had a solid rocket motor in the projectile. The follow-on 2G-2 proposal was to have had a second rocket motor in order to be able to place the second stage in orbit, though with little or no payload. After development, it underwent horizontal development firings from the Highwater gun in 1966 but failed to be properly tested in time. Martlet 3 The Martlet 3 series consisted of advanced rocket-propelled projectiles. They were built and tested for the HARP project but were ultimately not successful due to restrictions in funding and a severe lack of technical information regarding the behavior of large rocket grains  under high acceleration loading. When testing these projectiles, the danger of in-bore detonation was considered a very serious potential problem. Martlet 3A The Martlet 3A was an diameter, gun-fired rocket projectile that theoretically was able to reach 500km altitude. As HARP's first attempt at a low-cost sabotted rocket system, the projectile was built with fiberglass or aluminum bodies. A standard 6-inch rocket was bonded to an aluminum case , and the rocket nozzle was supported by a pusher plate, which would impart the acceleration thrust to the missile through the aluminum wall casing. Fiberglass limited acceleration to 3600g (corresponding to a velocity of at rocket ignition). The Martlet 3A's original objective was to carry a 40-lbs payload to an altitude of 500km, which theoretically was feasible if the system could be launched at full gun pressures. The rocket motors' solid propellant deformed during firing and the design was never successful, despite several test firings.
after_revision: Martlet 2G and 2G-1 The Martlet 2G was an advanced test projectile with nearly all of its total 350lb (160kg) weight in the projectile. It was tested successfully with the Highwater gun and the Barbados gun but never proceeded beyond the engineering flight testing stage. The Martlet 2G-1 was a proposed space launch vehicle variant of Martlet 2G, which had a solid rocket motor in the projectile. The follow-on 2G-2 proposal was to have had a second rocket motor to place the second stage in orbit, though with little or no payload. After development, it underwent horizontal development firings from the Highwater gun in 1966 but failed to be properly tested in time. Martlet 3 The Martlet 3 series consisted of advanced rocket-propelled projectiles. They were built and tested for the HARP project but were ultimately not successful due to restrictions in funding and a severe lack of technical information regarding large rocket grains ' behaviour under high acceleration loading. When testing these projectiles, the danger of in-bore detonation was considered a severe potential problem. Martlet 3A The Martlet 3A was an diameter, gun-fired rocket projectile that theoretically could reach 500km altitude. As HARP's first attempt at a low-cost sabotted rocket system, the projectile was built with fiberglass or aluminum bodies. A standard 6-inch rocket was bonded to an aluminum case . The rocket nozzle was supported by a pusher plate, which would impart the missile's acceleration through the aluminum wall casing. Fiberglass limited acceleration to 3600g (corresponding to a velocity of at rocket ignition). The Martlet 3A's original objective was to carry a 40-lbs payload to an altitude of 500km, which theoretically was feasible if the system could be launched at full gun pressures. The rocket motors' solid propellant deformed during firing and the design was never successful, despite several test firings.
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