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HARP 7-1
HARP 7 inch Gun
HARP 7 inch Gun
Canadian earth atmosphere suborbital probe. Flights from 1961. 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.

Status: Operational 1961. Gross mass: 27 kg (60 lb). Height: 1.64 m (5.38 ft). Span: 0.18 m (0.58 ft).

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.

The 7-1 probe, although serviceable as an atmospheric tool, failed to reach its theoretical apogee in test flights. Although directly scaled from the 5-1 vehicle, it was not optimal for the 7 inch gun ballistics and was simply too heavy. A new vehicle was designed to take these factors into account and the 7-2 probe was created.

by Richard K Graf



Family: Earth, Gun-launched, Suborbital. Country: Canada. Launch Vehicles: 7 inch HARP Gun. Launch Sites: Wallops Island LA2. Agency: Bull.
Photo Gallery

HARP 7 & 5 in probesHARP 7 & 5 in probes
From left to right: HARP 7-1, 7-2, 5-1, and 5-3.



1968 April 12 - . 18:23 GMT - . Launch Site: Wallops Island. Launch Complex: Wallops Island LA2. Launch Vehicle: HARP 7-1.
  • Cesium package - . Nation: USA. Agency: BRL. Apogee: 96 km (59 mi).

1968 April 17 - . 20:43 GMT - . Launch Site: Wallops Island. Launch Complex: Wallops Island LA2. Launch Vehicle: HARP 7-1.
  • Cesium package - . Nation: USA. Agency: BRL. Apogee: 94 km (58 mi).

1968 September 11 - . 21:15 GMT - . Launch Site: Wallops Island. Launch Complex: Wallops Island LA2. Launch Vehicle: HARP 7-1.
  • Cesium package - . Nation: USA. Agency: BRL. Apogee: 92 km (57 mi).

1968 September 11 - . 23:15 GMT - . Launch Site: Wallops Island. Launch Complex: Wallops Island LA2. Launch Vehicle: HARP 7-1.
  • Cesium package - . Nation: USA. Agency: BRL. Apogee: 93 km (57 mi).

1968 September 12 - . 03:27 GMT - . Launch Site: Wallops Island. Launch Complex: Wallops Island LA2. Launch Vehicle: HARP 7-1.
  • Cesium package - . Nation: USA. Agency: BRL. Apogee: 88 km (54 mi).

1969 February 14 - . 01:07 GMT - . Launch Site: Wallops Island. Launch Complex: Wallops Island LA2. Launch Vehicle: HARP 7-1.
  • Cesium package - . Nation: USA. Agency: BRL. Apogee: 100 km (60 mi).

1969 February 14 - . 03:24 GMT - . Launch Site: Wallops Island. Launch Complex: Wallops Island LA2. Launch Vehicle: HARP 7-1.
  • Cesium package - . Nation: USA. Agency: BRL. Apogee: 100 km (60 mi).

1969 February 14 - . 05:05 GMT - . Launch Site: Wallops Island. Launch Complex: Wallops Island LA2. Launch Vehicle: HARP 7-1.
  • Cesium package - . Nation: USA. Agency: BRL. Apogee: 99 km (61 mi).

1969 February 14 - . 07:05 GMT - . Launch Site: Wallops Island. Launch Complex: Wallops Island LA2. Launch Vehicle: HARP 7-1.
  • Cesium package - . Nation: USA. Agency: BRL. Apogee: 97 km (60 mi).

1969 February 14 - . 09:10 GMT - . Launch Site: Wallops Island. Launch Complex: Wallops Island LA2. Launch Vehicle: HARP 7-1.
  • Cesium package - . Nation: USA. Agency: BRL. Apogee: 100 km (60 mi).

1969 February 14 - . 11:23 GMT - . Launch Site: Wallops Island. Launch Complex: Wallops Island LA2. Launch Vehicle: HARP 7-1.
  • Cesium package - . Nation: USA. Agency: BRL. Apogee: 103 km (64 mi).

1969 June 3 - . 17:58 GMT - . Launch Site: Wallops Island. Launch Complex: Wallops Island LA2. Launch Vehicle: HARP 7-1.
  • Cesium package - . Nation: USA. Agency: BRL. Apogee: 102 km (63 mi).

1969 July 18 - . 17:16 GMT - . Launch Site: Wallops Island. Launch Complex: Wallops Island LA2. Launch Vehicle: HARP 7-1.
  • Cesium package - . Nation: USA. Agency: BRL. Apogee: 95 km (59 mi).

1969 July 23 - . 22:59 GMT - . Launch Site: Wallops Island. Launch Complex: Wallops Island LA2. Launch Vehicle: HARP 7-1.
  • Cesium package - . Nation: USA. Agency: BRL. Apogee: 99 km (61 mi).

1969 July 25 - . 10:19 GMT - . Launch Site: Wallops Island. Launch Complex: Wallops Island LA2. Launch Vehicle: HARP 7-1.
  • Cesium package - . Nation: USA. Agency: BRL. Apogee: 92 km (57 mi).


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