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Hotol 2
Hotol 2 is launched from the back of an Antonov 225
Credit - British Aerospace

In the beginning, nobody (except Jules Verne) thought anybody would be travelling to space and back in ballistic cannon balls. The only proper way for a space voyager to return to earth was at the controls of a real winged airplane. Peenemuende was already working on the A-4B and A-9/A-10 versions of their missiles before the war ended. Von Braun's concepts of the early 1950's imagined manned gliders with vast swept wingings alighting back at launch base on Earth - and on Mars! The first designs, including the initial space shuttle competitors of the late 1960's, consisted of two stages, both winged, both recovered at base, refueled, and relaunched. By the 1970's some NASA designers claimed a single-stage-to-orbit winged launch vehicle was possible. This was certainly a good alternative the SSTO ballistic designs, which relied on rocket thrust to hover and make a safe landing. As the space shuttle demonstrated, if you can glide you can land without having to rely on any rocket engines functioning. The appealing simplicity of the concept has been offset by the technological risk in developing it. The problem with any single-stage-to-orbit concept is that if the empty weight of the final vehicle has been underestimated it will not be able to deliver any payload to orbit, or even reach orbit. Since weight growth of up to 20% is not unknown in aerospace projects, this is a very real threat which has made both NASA and private investors reluctant to invest the billions of dollars it would take to develop a full-scale flight vehicle. Nonetheless Lockheed was selected in 1996 to develop the X-33 technology demonstrator for just such a vehicle. At last report it was suffering weight growth problems...
17K-AM A small two stage to orbit horizontal takeoff / horizontal landing vehicle proposed for the Russian Air Force in 1993....more.
  AACB Class 1 In 1965-1966 NASA and the Department of Defense jointly studied two-stage-to-orbit reusable launch vehicles as a follow-on to existing expendable launchers. Following...more.
  AACB Class 2 The AACB Class II launch vehicle was a fully reusable, two-stage-to-orbit launch vehicle. Both stages would be lifting bodies and be powered by Lox/LH2 engines....more.
AACB Class 3 The AACB Class III launch vehicle was an advanced concept use air-breathing stages, but still requiring two stages to achieve orbit. The joint NASA/USAF panel concluded...more.
  Aerospaceplane Development project from 1958-1963 for a horizontal takeoff / horizontal landing, single-stage-to-orbit vehicle that would carry three crew and additional paylaod from any airfield to orbit and back...more.
Ares FBB The ARES ((Affordable REsponsive Spacelift) concept was of a reusable fly-back booster with expendable upper stages. The US Air Force began development of a demonstrator...more.
Ascender The Bristol Spaceplanes Ascender of the 1990`s was a sub-orbital manned spaceplane concept proposed by David Ashford. The Ascender spaceplane would use a small...more.
  Astroplane Martin concept of 1961 for a horizontal takeoff / horizontal landing, single-stage-to-orbit vehicle that would be powered by nuclear magnetohydrodynamic engines....more.
Chang Cheng 1 The Chang Cheng 1 (Great Wall 1) vertical takeoff / horizontal landing two-stage space shuttle was a compromise design created jointly by Shanghai Astronautics...more.
  CNES Shuttle 1963 French studies in the 1960's were supervised by the French Space Agency, CNES, and developed along two paths. Path 1 was a manned hypersonic booster stage, with...more.
  Copper Canyon DARPA program of 1984 that proved the technologies and concept for the X-30 National Aerospace Plane concept....more.
Douglas Astro The Douglas "Astro" was a VTHL TSTO system designed for launching space station crews and cargo by the 1968-70 period. A key requirement was that off-the-shelf...more.
  DSL HTHL Under the Future European Space Transportation Investigation Programme (FESTIP) of 1994-1999 French agencies and contractors designed a number of alternative reusable...more.
EARL Vertical takoff / horizontal landing two-stage launch vehicle study from the 1980s....more.
Energia The Energia-Buran Reusable Space System (MKS) began development in 1976 as a Soviet booster that would exceed the capabilities of the US shuttle system. Following...more.
EXTV This was to be a reusable winged rocket-powered atmospheric reentry demonstrator capable of reaching speeds of Mach 4 to 10 in the atmosphere. The aim was for ESA...more.
FLTP Europe's Future Launcher Technology Program (FLTP) was an ESA study program that ran from 1999-2002, with the objective of identifying and developing technologies...more.
Gryphon Winged, horizontal-takeoff/horizontal concept space booster concept using an Air Collection and Enrichment System to generate liquid oxygen oxidiser from the atmosphere...more.
H-2 HTOHL The H-2 horizontal takeoff / horizontal landing two-stage reusable space shuttle was proposed by Institute 601 of the Air Ministry in 1988. The first stage would...more.
  He-112 The Heinkel He-112 was an unsuccessful pre-war German monoplane fighter, competing for orders with the Bf 109. However it entered rocketry history when tests were conducted with rocket engines....more.
HOTOL This single-stage-to-orbit winged horizontal takeoff/horizontal landing launch vehicle concept was powered by the unique Rolls-Royce RB545 air / liquid hydrogen...more.
Hytex Following the cancellation of Saenger II, Germany briefly considered a manned X-15/NASP type flight test vehicle (HYTEX) capable of Mach 6 flight. This too was cancelled for cost reasons....more.
  Isinglass CIA air-launched, rocket-powered high speed manned vehicle project of 1965-1968 that developed basic technologies used in later shuttle and reusable launch vehicle programmes....more.
Japanese Space Plane NAL / Mitsubishi Heavy Industries, Ltd. design for a single stage to orbit spaceplane. Crew of ten, empty mass 110 tonnes. LACE / Scramjet engines, 29 m wingspan....more.
  LART MBB/ERNO airbreathing horizontal takeoff / horizontal landing single stage to orbit proposal from the mid-1980s. Largely similar to the BAe HOTOL....more.
  Martin Astrorocket Early two-stage-to-orbit shuttle study, using storable propellants, Dynasoar-configuration delta wing orbiter and booster....more.
McDonnell-Douglas ILRV The McDonnell-Douglas ILRV design featured fold-out wings for improved low-speed lift-to-drag ratio during final descent and landing. All of the vehicle’s propellants...more.
  Me-163 The rocket-powered Messerschmitt Me-163 was the world's first and only operational pure rocket fighter and represented the culmination of Alexander Lippisch's years...more.
  MIGAKS Turbojet/ramjet-powered two stage to orbit horizontal takeoff / horizontal landing vehicle. Mach 6 stage separation. The orbiter had a 2000 km cross-range capability...more.
  Mikoyan 301 The 301 was designed as a military bomber, with a Mach 4 / 4,250 km/hr cruise capability at 25,000 to 27,000 m altitude. It was equipped with two turboramjets,...more.
  Mustard The British Aircraft Corporation "Multi-Unit Space Transport And Recovery Device" design of 1964-1965 was a winged two-stage-to-orbit reuseable space shuttle using...more.
Norma Semi-reusable vertically launched two-stage-to-orbit vehicle. The flight profile featured a reusable flyback booster launched from a modular launch platform, an...more.
Orel In the late 1990's the Russian space industry undertook the Orel programme to evaluate technology for future launch vehicles. The goals included evaluation of possible...more.
  Oriflamme French design for a scramjet-powered horizontal takeoff / horizontal landing, single stage to orbit vehicle....more.
  Radiance Two stage to orbit horizontal takeoff / horizontal landing vehicle. Booster would be powered by scramjets to Mach 12 separation before second stage separated....more.
  RAE Orbital Fighter The Royal Aircraft Establishment Orbital Fighter proposal of the 1960's envisioned a two stage vehicle. A ramjet powered first stage would release a second stage...more.
  RAE TSTO The Royal Aircraft Establishment Two Stage To Orbit (TSTO) Concept of the 1960's consisted of a hypersonic air-breathing first stage and rocket powered second stage....more.
  RBSS The Recoverable Booster Space System was a plan circulated in the early 1960's to use the XB-70 as a recoverable supersonic first stage for a range of systems....more.
Recoverable Booster Systems for Orbital Logistics Lockheed investigated the economics of reusable launch vehicles for crews and light space station cargo during the early 1960s. Anticipated manned space activities...more.
  RWDT HTHL Under the Future European Space Transportation Investigation Programme (FESTIP) of 1994-1999 French agencies and contractors designed a number of alternative reusable...more.
Saenger Saenger-Bredt antipodal bomber - sled launched, boosted to suborbital velocity, 'skips' off upper atmosphere to deliver bombload on target, recovery back at launch...more.
Saenger I Final version of the Saenger spaceplane, as conceived by Eugen Saenger during his lifetime. A rocket propelled sled would be used for horizontal launch of delta-winged,...more.
Saenger II Proposed two stage to orbit vehicle. Air-breathing hypersonic first stage and delta wing second stage. The German Hypersonics Programme and its Saenger II reference...more.
Shuttle The manned reusable space system which was designed to slash the cost of space transport and replace all expendable launch vehicles. It did neither, but did keep...more.
Skylon British single-stage-to-orbit, horizontal-takeoff-horizontal-landing turborocket orbital launch vehicle design of the mid-1990's. The novel lightweight structural...more.
Spacebus The Bristol Spaceplanes Spacebus was a Two Stage To Orbit (TSTO) Manned Spaceplane, with an airbreathing supersonic / hypersonic, delta winged first stage and a...more.
  Spacecab The Bristol Spaceplanes Spacecab was a Two Stage To Orbit (TSTO) Manned Spaceplane, with an airbreathing supersonic / hypersonic, delta winged first stage and a...more.
Spacemaster Martin-Marrietta shuttle Phase A design. X-24B type lifting body orbiter with unique catamaran-configuration booster....more.
Spiral 50-50 The Soviet Air Force had an enduring interest in a horizontal takeoff/horizontal landing, manned, reusable space launch system that could ferry crews and priority...more.
STAR-H Mach 6 hypersonic first stage would launch Hermes spaceplane with an expendable second stage....more.
Star-raker Rockwell International's Star-raker was an enormous 1979 heavy-lift ramjet/rocket horizontal takeoff/horizontal landing single-stage-to-orbit concept capable of...more.
Starclipper Lockheed ILRV design created for the USAF in 1966. X-24B lifting body configuration orbiter with linear aerospike engine and wrap-around drop tank. Related to Lockheed Shuttle LS200 proposal....more.
Starclipper Light Downsized version of the Starclipper, equipped with conventional bell nozzle engines, released by NASA for public consumption in 1968....more.
STS-2000 SSTO Single stage to orbit ramjet/rocket mix power horizontal takeoff / horizontal landing study of the 1980's....more.
STS-2000 TSTO Two stage to orbit horizontal takeoff / horizontal landing variant of STS-2000. Ramjet/rocket mixed power first stage. Mach 6 separation of rocket-powered second stage. French study of the 1980's....more.
TARANIS French study of vertical takeoff / horizontal landing, two stage to orbit launch vehicle with expendable orbiter fuel tanks....more.
  TAV USAF program of the 1980's that reached the test hardware stage and was leading to a single-stage-to-orbit, rocket-powered, winged manned vehicle. Halted in favour...more.
Themis Themis was a planned ESA booster stage demonstrator, to validate integrated propellant tank technology necessary for a reusable Ariane 5 successor. The demonstrator...more.
Tier One Burt Rutan's Tier One was the second manned reusable suborbital launch system (after the B-52/X-15). But it was developed privately at a small fraction of the cost....more.
Triamese The General Dynamics proposed an ingenious "Triamese" concept for the US Air Force "Integral Launch & Re-entry Vehicle" program. This system (originally developed...more.
Tsien Spaceplane 1949 In 1949 Tsien Hsue-shen, the leading expert in high-speed aerodynamics working in America, applied the knowledge learned from German rocket developments to the...more.
Tu-2000 This Soviet equivalent to the US X-30 single-stage-to-orbit scramjet aerospaceplane began development in1986. Three versions were planned: a Mach 6 test vehicle,...more.
V-2 VTOHL The V-2 vertical takeoff / horizontal landing two-stage reusable space shuttle was proposed by Beijing Department 11 of the Air Ministry in 1988. The first stage...more.
X-33 NASA-sponsored suborbital unmanned prototype for a single-stage-to-orbit rocketplane. The Lockheed Martin vehicle would have used a linear aerospike engine, metallic...more.
Astro Douglas design of the early 1960's for a two-stage-to-orbit, winged, recoverable vehicle. Two versions were envisioned - a preliminary one the size of a DC-8 and...more.

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