Encyclopedia Astronautica
Delta Thor XLT

Lox/Kerosene propellant rocket stage. Loaded/empty mass 101,700/5,690 kg. Thrust 1,032.00 kN. Vacuum specific impulse 295 seconds.

Cost $ : 11.600 million.

AKA: Extra ELT Thor.
Status: Retired 1992.
Gross mass: 101,700 kg (224,200 lb).
Unfuelled mass: 5,690 kg (12,540 lb).
Height: 26.05 m (85.46 ft).
Diameter: 2.44 m (8.00 ft).
Span: 2.44 m (8.00 ft).
Thrust: 1,032.00 kN (232,003 lbf).
Specific impulse: 295 s.
Specific impulse sea level: 264 s.
Burn time: 274 s.
Number: 14 .

More... - Chronology...

Associated Countries
Associated Engines
  • RS-27A Rocketdyne Lox/Kerosene rocket engine. 1054.2 kN. . Isp=302s. Replaced the RS-27 as the main system for the Delta and in the MA- 5A for the Atlas. RS2701B main engine, and twin LR101-NA-11 verniers. First flight 1989. More...

Associated Launch Vehicles
  • Delta 6925 American orbital launch vehicle. Four stage vehicle consisting of 9 x Castor 4A + 1 x EELT Thor/RS-27+ 1 x Delta K + 1 x Star 48B More...

Associated Propellants
  • Lox/Kerosene Liquid oxygen was the earliest, cheapest, safest, and eventually the preferred oxidiser for large space launchers. Its main drawback is that it is moderately cryogenic, and therefore not suitable for military uses where storage of the fuelled missile and quick launch are required. In January 1953 Rocketdyne commenced the REAP program to develop a number of improvements to the engines being developed for the Navaho and Atlas missiles. Among these was development of a special grade of kerosene suitable for rocket engines. Prior to that any number of rocket propellants derived from petroleum had been used. Goddard had begun with gasoline, and there were experimental engines powered by kerosene, diesel oil, paint thinner, or jet fuel kerosene JP-4 or JP-5. The wide variance in physical properties among fuels of the same class led to the identification of narrow-range petroleum fractions, embodied in 1954 in the standard US kerosene rocket fuel RP-1, covered by Military Specification MIL-R-25576. In Russia, similar specifications were developed for kerosene under the specifications T-1 and RG-1. The Russians also developed a compound of unknown formulation in the 1980's known as 'Sintin', or synthetic kerosene. More...

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