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HARP 5-1
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The HARP 5-1 gun probe was a dart-shaped, sub-caliber vehicle with a major diameter of 66 mm, a length of 116 cm and a flight weight of 10.4 kg. The probe used a discarding four quadrant centre sabot which consisted of an aluminum crown, a plastic base and a obdurator disk. The probe body consisted of a discarding aluminum nose cone to permit payload ejection, a hollow steel main body to carry the payload and an aluminum tail boom with four fins for stability. The payload compartment of the 5.1 probe was 48 mm in diameter, 225 mm long and could carry a 0.9 kg (2 lb.) payload to 76 km.
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HARP 5-3
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The HARP 5-3 probe was developed during HARP to reduce the complexity of the 5 inch vehicles and in particular the nose eject system used by the HARP 5-1 probe. Although simple in design, the components which made up the nose eject system of the 5-1 probe constituted a considerable portion of the 5-1 probes manufacturing resources. To simplify the manufacturing of the 5 inch probes a new probe design was considered that replaced the 5-1 tapered boat tail with a straight tail and permitted payloads to be ejected out the rear of the projectile at altitudes of up to 61 km.
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HARP 7-1
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The original HARP 7-1 gun probe was fundamentally a scaled up version of the 5-1 gun probe and was used for similar payloads.. The 7-1 probe had a mean diameter of 91 mm, a length of 1640 mm, and a flight weight of 27.3 kg. The vehicle was launched at a velocity of 1650 m/s (5400 ft/sec) with a 50 kg (110 lb) charge of M17 propellant.
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HARP 7-2
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The Harp 7-2 vehicle was an optimized version of the 7-1 vehicle. The 7-2 had a body diameter of 76 mm a length of 1410 mm a flight weight of 18.2 kg and a payload volume of 2048 cc. The 7-2 prove was designed with a much-improved streamlined shape and exhibited far cleaner aerodynamics. The smaller 7-2 probe was capable of reaching altitudes of 105 km which allowed it to carry payloads through the D-layer and into the lower E-layer of the ionosphere - the very edge of space itself.
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© Mark Wade, 1997 - 2008 except where otherwise noted.
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