Encyclopedia Astronautica
Martlet 4-2


Bull solid rocket engine. 20.6 kN. Development ended 1966. Isp=300s. Used on Martlet 4 launch vehicle.

Thrust (sl): 14.400 kN (3,237 lbf). Thrust (sl): 1,470 kgf.

Status: Development ended 1966.
Gross mass: 175 kg (385 lb).
Unfuelled mass: 35 kg (77 lb).
Height: 4.00 m (13.10 ft).
Diameter: 0.30 m (0.98 ft).
Thrust: 20.60 kN (4,631 lbf).
Specific impulse: 300 s.
Specific impulse sea level: 210 s.
Burn time: 20 s.

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Associated Countries
See also
Associated Launch Vehicles
  • Martlet 4 Canadian gun-launched orbital launch vehicle. The Martlet 4 was ultimate goal of the HARP program - a gun-launched orbital launch vehicle. Two versions were considered: a preliminary version with two solid propellant upper stages, and a later model with two liquid propellant upper stages. Payload of the liquid propellant version would have reached 90 kg. The initial version was in an advanced stage of suborbital flight test when the HARP program was cancelled in 1967. More...

Associated Manufacturers and Agencies
  • Bull Canadian manufacturer of rockets, spacecraft, and rocket engines. Bull, Canada. More...

Associated Propellants
  • Solid Solid propellants have the fuel and oxidiser embedded in a rubbery matrix. They were developed to a high degree of perfection in the United States in the 1950's and 1960's. In Russia, development was slower, due to a lack of technical leadership in the area and rail handling problems. Solid propellants have the fuel and oxidiser embedded in a rubbery matrix. They were developed to a high degree of perfection in the United States in the 1950's and 1960's. In Russia, development was slower, due to a lack of technical leadership in the area and rail handling problems. More...

Associated Stages
  • Martlet 4L-2 N2O4/UDMH propellant rocket stage. Loaded/empty mass 243/46 kg. Thrust 20.50 kN. Vacuum specific impulse 300 seconds. More...
  • Martlet 4B Solid propellant rocket stage. Loaded/empty mass 230/45 kg. Thrust 20.50 kN. Vacuum specific impulse 300 seconds. More...
  • Martlet 4i-2 Solid propellant rocket stage. Loaded/empty mass 183/35 kg. Thrust 20.50 kN. Vacuum specific impulse 300 seconds. More...

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