This is the X248-A2 solid fuel rocket motor, also called Altair, that powered the third stage of the Vanguard III launch vehicle, launched in 1959. Altair was also used as the third stage of the Thor-Able-4 vehicle that launched the Pioneer V space probe and Tiros 1, the first weather satellite, and third stage for the Pioneer I, Explorer VI, and other launch vehicles.
The motor, built by the Allegheny Ballistic Laboratory of Hercules Inc., produced 3,070 pounds of thrust and was made with a filament-wound fiber-reinforced epoxy resin. This very strong construction, plus the motor's high performance for its small weight, made it a pioneering development in solid fuel rocket technology. This object was donated to the Smithsonian in 1968 by the Alleghany Ballistics Lab.
Display Status
This object is on display in Rockets & Missiles at the Steven F. Udvar-Hazy Center in Chantilly, VA.
Object Details
Date
ca. 1956-1960 [for actual motor]; ca. mid-1960's
Country of Origin
United States of America
Type
PROPULSION-Rocket Engines
Manufacturer
Alleghany Ballistics Laboratory, Hercules Incorporated
Dimensions
Overall: 5 ft. long x 1 ft. 5 in. diameter, 203 lb. (152.4 x 43.18cm, 92.1kg)
Materials
Casing, Spiralloy filament-wound fiberglass reinforced epoxy resin
Inventory Number
A19680576000
Credit Line
Gift of Alleghany Ballistics Laboratory, Hercules Incorporated
Data Source
National Air and Space Museum
Restrictions & Rights
Usage conditions apply
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