Encyclopedia Astronautica
M55/TX-55/Tu-122


Thiokol solid rocket engine. 792 kN. In production. Isp=262s. Proposed as strap-on booster for Saturn IB-C, Saturn INT-14, Saturn INT-15, Saturn INT-19 variants. First flight 2000.

Propellant Formulation: TP-H1011 Type II.

Status: In production.
Gross mass: 23,077 kg (50,876 lb).
Unfuelled mass: 2,292 kg (5,052 lb).
Height: 7.49 m (24.57 ft).
Diameter: 1.67 m (5.47 ft).
Thrust: 792.00 kN (178,048 lbf).
Specific impulse: 262 s.
Specific impulse sea level: 237 s.
Burn time: 60 s.
Number: 5 .

More... - Chronology...


Associated Countries
See also
Associated Launch Vehicles
  • Saturn IB-C American orbital launch vehicle. Douglas Studies, 1965: 4 Minuteman strap-ons; standard S-IB, S-IVB stages. More...
  • Saturn INT-14 American orbital launch vehicle. Chrysler Studies, 1966: S-IB with 4 Minuteman motors as strap-ons, with no, 10, or 20-foot stretch S-IB stages, S-IVB stage. S-IB ignition at sea level at same time as strap-ons. More...
  • Saturn INT-15 American orbital launch vehicle. Chrysler Studies, 1966: S-IB with 8 Minuteman motors as strap-ons, with no, 10, or 20-foot stretch S-IB stages, S-IVB stage. S-IB ignition at sea level at same time as strap-ons. More...
  • Saturn INT-19 North American study, 1966. Saturn variant with 4 to 12 Minuteman motors as boosters, Saturn II stage as core, and Saturn IVB upper stage. Saturn II stage would be fitted with lower expansion ratio engines and would ignite at sea level. Various combinations of numbers of strap-ons, propellant loading of the two core stages were studied. More...
  • Minuteman 3 American four-stage solid-propellant intercontinental ballistic missile. In the 21st Century, the sole remaining US ICBM. More...

Associated Manufacturers and Agencies
  • Thiokol American manufacturer of rocket engines and rockets. Thiokol Corporation, Ogden, UT, USA. 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
  • Minuteman-1 Solid propellant rocket stage. Loaded/empty mass 23,077/2,292 kg. Thrust 791.30 kN. Vacuum specific impulse 262 seconds. First stage of Minuteman I. Proposed as zero stage for various Saturn variants in 1960's. Surplus motors used in ABM SDI tests in 1980's and 1990's. More...

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