The Delta 2 rocket
SPACEFLIGHT NOW/BOEING FACT SHEET
Posted: April 20, 2000
Manufactured by Rocketdyne, a division of Boeing, the RS-27A main engine operates on liquid oxygen and RP-1 (kerosene). The RS-27A has a sea-level thrust of 200,000 pounds. Each of the three Alliant Techsystems solid strap-on motors has a sea-level thrust of 100,270 pounds. The main engine and the four solid rocket motors deliver a total thrust of 483,000 pounds at liftoff.
An Aerojet AJ10-118K engine powers the second stage and burns Aerozine-50 fuel and nitrogen tetroxide oxidizer. Ignited at altitude, the engine has a vacuum-rated thrust of 9,815 pounds.
The third stage is Thiokol's Star 48D solid-propellant stage.
The Boeing family of launch vehicles is derived from the Delta family of rockets built and launched since 1960. In that time 277 Deltas have been launched.
Delta 2 rockets can be configured as two- or three-stage vehicles depending on mission requirements. The latest version, the Delta 2 7925 model, can boost 3,965 pounds (1800 kg) to geosynchronous transfer orbit (GTO).
Today, Boeing has a growing list of commercial customers, including Hughes Space and Communications International, Inc., Space Systems/Loral, and Motorola. Delta rocket were used to launch 28 satellites to form the cornerstone of the Globastar system.
To serve its commercial customers, Boeing has agreements with the U.S. Air Force and NASA for the use of two government-owned launch pads at Space Launch Complex 17, Cape Canaveral Air Station, Fla., and one pad at Space Launch Complex 2, Vandenberg Air Force Base, Calif.
Major subcontractors include: Alliant Techsystems, Magna, Utah, graphite epoxy motors for boost assist; Aerojet, Sacramento, Calif., second-stage engine; Thiokol, a subsidiary of Cordant Technologies, Elkton, Md., third-stage solid rocket motor; and AlliedSignal, Teterboro, N.J., Redundant Inertial Flight Control Assembly (RIFCA) provides course and attitude control.
Flight Data File
Vehicle: Delta 2 (7925)
Payload: GPS 2R-4
Launch date: April 22, 2000
Launch window: 0305-0335 GMT (11:05-11:35 p.m. EDT on 21st)
Launch site: SLC-17A, Cape Canaveral, Fla.
Launch Preview - Our story gives a complete report on the upcoming launch.
Launch timeline - Chart with times and descriptions of events to occur during the launch.
Orbit trace - A map shows the launch track for the mission.
Global Positioning System - Description of the U.S. Air Force's space-based navigation network.
GPS constellation - Chart shows the current status of the orbiting GPS satellite fleet.
Explore the Net
Delta 2 - Official Web site of Boeing's Delta 2 expendable launch vehicle program.
GPS - Global Positioning System Joint Program Office at U.S. Air Force.
LMMS - Lockheed Martin Missiles & Space built GPS 2R-4.
1st Space Launch Squadron - Oversees Delta rocket launches and facilities at Cape Canaveral Air Force Station in Florida.
History of Delta - A private Web site devoted to past Delta launches with valuable facts and figures.
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