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DH-1 (rocket)
The DH-1〔The Rocket Company; American Institute of Aeronautics and Astronautics; ISBN 1-56347-696-7〕 is a reusable two-stage-to-orbit rocket proposed in the book ''The Rocket Company'' by Patrick J. G. Stiennon, David M. Hoerr, Doug Birkholz (AIAA, 2005). The concept is patented.〔(Two stage launch vehicle and launch trajectory method - Gates, William Henry )〕 The DH-1 has not (yet) been built, and its manufacturing company, AM&M, is also fictional. The book highlights and seeks to solve many problems of building a Cheap Access To Space vehicle via the DH-1 design. "The Rocket Company" is a work of fiction, but the science, engineering and politics that underlies the design of the DH-1 are described as highly-feasible. The design is notable in that it attempts to avoid new or nonexistent wonder technologies, to rely on human rather than computer control, to consider the possible economics of a very small payload capacity (including pilot), to make use of a 'pop up first stage' launch profile, to market the vehicle for 'space access' rather than 'cargo delivery', and to offer a business plan whose intention is to sell the DH-1 vehicles themselves, rather than payload space on a company launch vehicle, as is currently the norm.
==First stage==
The first stage is cylindrical in shape, and . It has an empty weight of , carries of methane and oxygen, and a gross lift-off weight (GLOW) of , including the second stage. It is fitted with five RL-60 and 4 RL-10 sustainer engines, and 4 small jet landing engines, all modified to burn methane. At launch it is mounted on four internal launch-rails fitted with pneumatic shock absorbers, rather than locked to the launch frame with explosive bolts. Allowing the DH-1 to rise as soon as thrust exceeds weight avoids sudden shock loads and allows it to settle back onto the launch frame in the event of critical engine failure in the first few meters of flight.
Flight is functionally similar to the DC-X. At launch all 9 rockets are fired until the DH-1 reaches 100,000 feet. At that point the RL-60s are shut down and the sustainer engines push the rocket up to 200,000 ft (~60 km) where separation occurs. The first stage flight profile is almost entirely vertical, with only slight sideways motion to keep above the launch/landing area. The first stage then drops back to the launch site, experiencing 'reentry heating' roughly comparable to the SR-71, releasing a drogue chute at 120,000 ft, and decelerating and landing with 30 seconds reserve fuel on the jet engines.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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