before_revision: Yuma Proving Ground The 16-inch HARP gun at Yuma Proving Ground was constructed in 1966 in order to establish a functional 16-inch gun on American soil and holds the record for achieving the highest projectile launched. It was almost identical to the 16-inch gun on Barbados, being 119ft long, but was limited by a 35-mile range restriction. However, unlike the Barbados gun, its projectiles could be recovered since they were not lost in the ocean upon their journey back down. The Yuma 16-inch gun was primarily used for flight tests, such as those testing altitude control and telemetry components. In 1966, the 16-inch Yuma gun underwent three firing series using wooden slugs, Martlet 2C's, and a Low Altitude High Velocity cone. +Performance Test of Yuma 16-inch HARP gun in 1966DateRound numberAll projectiles used for this test were Martlet 2C's, except for the ones indicated with (W), i.e. wooded slugs, and (L), i.e. Low Altitude High Velocity cone.Mass (lb)Muzzle velocity (ft/s)Apogee (kilofeet)June 7001 (W)7003360No trackJune 8002 (W)8003190No trackJune 13003 (W)6604810No trackJune 130047605930415June 130057805810398June 140067806060400June 140078006270DamagedJune 150087605630375June 150097805850410Oct. 2501010955250310Oct. 2601112255950410Oct. 260129206800540Oct. 27013 (L)9007100No trackOct. 2701412755900415Oct. 270159206780535Oct. 270169507040DamagedNov. 1601712905900396Nov. 1601812925900395Nov. 1601912965850415Nov.1702012965950415Nov. 170211290NADamagedNov. 1802212635900400Nov. 1802312635850410Nov. 180249226650510Nov. 180258806400490Nov. 190269106650530Nov. 1902712705850400Nov. 190289607000590Nov. 190291270NADamagedNov. 190309606350480Nov. 1903112705650367Nov. 1903212705650370Nov. 190338806750550 There were several models of test projectiles  fired or designed during Project HARP: These projectiles were fired on the island of Barbados and some were fired by the US Army's Ballistic Research Lab. The slender design of the tube which contained the rocket's payload  was very narrow and long, limiting what objects could be inserted into the tube. This limitation on size was extremely inconvenient when considering the future proposed payloads of Martlet rockets which included satellites and space probes. The cannon-like design also eliminated the capacity for crewed space travel as well as the launching of satellites carrying extremely sensitive scientific instruments and payloads due to the extreme acceleration placed on the projectile during firing. Martlet 2A, 2B, 2C family The Martlet 2A, 2B, and 2C represented the earliest of the Martlet 2 16-inch (406mm) test projectiles. Marlet 2A was designed simultaneously with the Martlet 1 with a range of interest being 70 to 200 kilometers. Most carried multi-type research payloads studying the upper atmosphere and near-space conditions. Due to their low cost per missile launch, they were used to test out single payloads. Despite similarities in missile air frame , the Martlet 2A, 2B, and 2C featured differences in their structural materials and mechanical details. For the Martlet 2A, the liquid payload was loaded into an aluminum, tapered liner inside the missile body. But by the development of the Martlet 2C series, the aluminum insert was abandoned altogether to allow the liquid payload to be housed in contact with the steel body, increasing the quantity of the liquid payload that could be carried.
after_revision: Yuma Proving Ground The 16-inch HARP gun at Yuma Proving Ground was constructed in 1966 in order to establish a functional 16-inch gun on American soil and holds the record for achieving the highest projectile launched. It was almost identical to the 16-inch gun on Barbados, being 119ft long, but was limited by a 35-mile range restriction. However, unlike the Barbados gun, its projectiles could be recovered since they were not lost in the ocean upon their journey back down. The Yuma 16-inch gun was primarily used for flight tests, such as those testing altitude control and telemetry components. In 1966, the 16-inch Yuma gun underwent three firing series using wooden slugs, Martlet 2C's, and a Low Altitude High-Velocity cone. +Performance Test of Yuma 16-inch HARP gun in 1966DateRound numberAll projectiles used for this test were Martlet 2C's, except for the ones indicated with (W), i.e. wooded slugs, and (L), i.e. Low Altitude High Velocity cone.Mass (lb)Muzzle velocity (ft/s)Apogee (kilofeet)June 7001 (W)7003360No trackJune 8002 (W)8003190No trackJune 13003 (W)6604810No trackJune 130047605930415June 130057805810398June 140067806060400June 140078006270DamagedJune 150087605630375June 150097805850410Oct. 2501010955250310Oct. 2601112255950410Oct. 260129206800540Oct. 27013 (L)9007100No trackOct. 2701412755900415Oct. 270159206780535Oct. 270169507040DamagedNov. 1601712905900396Nov. 1601812925900395Nov. 1601912965850415Nov.1702012965950415Nov. 170211290NADamagedNov. 1802212635900400Nov. 1802312635850410Nov. 180249226650510Nov. 180258806400490Nov. 190269106650530Nov. 1902712705850400Nov. 190289607000590Nov. 190291270NADamagedNov. 190309606350480Nov. 1903112705650367Nov. 1903212705650370Nov. 190338806750550 Several models of test projectiles were fired or designed during Project HARP: These projectiles were fired on the island of Barbados and some were fired by the US Army's Ballistic Research Lab. The tube's slender design, which contained the rocket's payload , was very narrow and long, limiting what objects could be inserted into the tube. This limitation on size was extremely inconvenient when considering the future proposed payloads of Martlet rockets , including satellites and space probes. The cannon-like design also eliminated the capacity for crewed space travel as well as the launching of satellites carrying extremely sensitive scientific instruments and payloads due to the extreme acceleration placed on the projectile during firing. Martlet 2A, 2B, 2C family The Martlet 2A, 2B, and 2C represented the earliest of the Martlet 2 16-inch (406mm) test projectiles. Martlet 2A was designed simultaneously with the Martlet 1 with a range of interest being 70 to 200 kilometers. Most carried multi-type research payloads studying the upper atmosphere and near-space conditions. Due to their low cost per missile launch, they were used to test out single payloads. Despite similarities in missile airframe , the Martlet 2A, 2B, and 2C featured differences in their structural materials and mechanical details. For the Martlet 2A, the liquid payload was loaded into an aluminum, tapered liner inside the missile body. But by the development of the Martlet 2C series, the aluminum insert was abandoned altogether to allow the liquid payload to be housed in contact with the steel body, increasing the quantity of the liquid payload that could be carried.
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