Encyclopedia Astronautica
D-18T


Lotarev turbofan engine. 229.4 kN. Used on An-225 launch aircraft for Interim HOTOL, MAKS concepts. Development ended 1988. Isp=9000s.

Application: An-225.

Thrust (sl): 203.900 kN (45,839 lbf). Thrust (sl): 20,796 kgf. Engine: 4,500 kg (9,900 lb). Thrust to Weight Ratio: 5.19.

Status: Development ended 1988.
Unfuelled mass: 4,500 kg (9,900 lb).
Thrust: 229.40 kN (51,571 lbf).
Specific impulse: 9,000 s.
Specific impulse sea level: 8,000 s.
Burn time: 3,375 s.

More... - Chronology...


Associated Countries
See also
Associated Launch Vehicles
  • MAKS Russian air-launched winged orbital launch vehicle. The MAKS spaceplane was the ultimate development of the air-launched spaceplane studies conducted by NPO Molniya. The draft project for MAKS was completed in 1988 and consisted of 220 volumes, generated by NPO Molniya and 70 sub-contractors and government institutes. Development of MAKS was authorised but cancelled in 1991. At the time of the cancellation, mock-ups of both the MAKS orbiter and the external tank had been finished. A 9,000 kgf experimental engine with 19 injectors was tested. There were 50 test burns proving the separate modes and a smooth switch between them. Since it was expected that MAKS could reduce the cost of transport to earth orbit by a factor of ten, it was hoped in the 1990's that development funding could be found. However this did not materialise. MAKS was to have flown by 1998. More...
  • Interim HOTOL Initiated by a British Aerospace team led by Dr Bob Parkinson in 1991, this was a less ambitious, scaled-back version of the original HOTOL. The single-stage to orbit winged launch vehicle using four Russian rocket engines. It was to have been air-launched from a Ukrainian An-225 Mriya (Dream) aircraft. Interim HOTOL would separate from the carrier aircraft at subsonic speeds, and would then pull up for the ascent to orbit. It would return via a gliding re-entry and landing on gear on a conventional runway. Interim HOTOL suffered from the same aerodynamic design challenges as HOTOL and went through many, many design iterations in the quest for a practical design. More...

Associated Manufacturers and Agencies
  • Lotarev Ukrainian manufacturer of rocket engines. Lotarev Design Bureau, Ukraine. More...

Associated Propellants
  • Air/Kerosene Ambient air (78 % nitrogen, 21% oxygen, etc.) is scooped up by air intakes and used in turbojet, turbofan, ramjet, scramjet, or other airbreathing engines. It is used to burn aviation-grade kerosene, commercial grade JP-4 or JP-5, their military equivalents, or special high-temperature blends such as those used in the SR-71. More...

Bibliography
  • Gunston, Bill, The Osprey Encylopedia of Russian Aircraft 1975-1995, Osprey, London, 1995.

Associated Stages
  • An-124 Subsonic rocket launch aircraft. Loaded mass 430,000 kg. Antonov cargo aircraft swept wing. Release conditions: Piggy-back, 200,000 kg, 900 kph at 8 to 9 km altitude. Effective velocity gain compared to vertical launch 270 m/s. More...
  • An-225 Subsonic rocket carrier. Loaded/empty mass 600,000/216,000 kg. Thrust 1,387.07 kN. Specific impulse 9000 seconds. Antonov cargo aircraft swept wing. Release conditions: Piggy-back, 275,000 kg, 38.0 m length x 24.0 m wingspan, 900 kph at 9,500 m altitude. Effective velocity gain compared to vertical launch 270 m/s. More...
  • Gerakl Subsonic rocket launch aircraft. Loaded mass 900,000 kg. NPO Molniya-1000 cargo aircraft, catamaran layout, twin-fuselage triplane. Release conditions: Suspended load, 450,000 kg, 900 kph at 9,500 m altitude. Effective velocity gain compared to vertical launch 270 m/s. More...

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