Friday, December 16, 2011

Mohr Rocket - Boosted dart system



"Engineer Ernst Mohr of Wuppertal, under the auspices of the German Rocket Society, developed a sounding rocket that was designed to reach altitudes of 50 km. A solid rocket motor with 7800 kgf would take the separable payload section to a speed of 1200 m/s. The booster had a diameter of 0.30 m, a length of 1.7 m, a total mass of 135 kg including 75 kg of solid propellant. The payload dart was 56 mm in diameter, 1.25 m long, and had a total mass of 15 kg.

Payload: 5.00 kg (11.00 lb) to a 50 km altitude.

Status: Retired 1959.
Gross mass: 150 kg (330 lb).
Payload: 5.00 kg (11.00 lb).
Height: 2.95 m (9.67 ft).
Diameter: 0.30 m (0.98 ft).
Thrust: 76.00 kN (17,085 lbf).
Apogee: 50 km (31 mi). " - Astronautix.com

I love the shape of that booster. It is obviously not a modern looking rocket, but for a boosted dart, the extra drag imposed by the stubby first stage is minimal, particularly if there is a fast burn.

2 comments:

Dick said...

Probably not that efficient, but it looks cool in a retro sort of way.

R2K said...

Yeah the football profile is not ideal, but it does offer a good propellant to rocket ratio. (About as good as an N 5800, one of our best motors.) With boosted darts, the lower stage only has minimal impact on the burnout as long as the burn rate is very fast. It would make a cool hpr rocket!