Shuttle-Derived Heavy Lift Launch Vehicle

An artist's conception of a Shuttle-C launching at night The Shuttle-Derived Heavy Lift Launch Vehicle ("HLV") was an alternate super heavy-lift launch vehicle proposal for the NASA Constellation program. It was first presented to the Augustine Commission on 17 June 2009.

Based on the Shuttle-C concept which has been the subject of various studies since the 1980s, the HLV was a Shuttle-Derived Launch Vehicle (SDLV) that proposed to replace the winged Orbiter from the Space Shuttle stack with a side-mounted payload carrier. The Space Shuttle's External Tank (ET) and four-segment Shuttle Solid Rocket Boosters (SRBs) would have remained the same.

According to initial estimates, the HLV could have been developed within 4 years for about US$6.6 billion, which was about 20% of the costs estimated for the Ares I and Ares V vehicle development. Provided by Wikipedia
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