Acceleration Engineering proposes to develop the Lucky Seven
single-stage manned suborbital vehicle. (X-Prize candidate).
Advent Launch Systems designed the Mayflower manned suborbital rocket. The project
was dropped in 1999 and the site is now offline. A dedicated page
with contact is still available here.
LLC designed the PA-X low-cost expendable launch vehicle.
(former X-Prize candidate).
American Astronautics Corp. proposes to develop the Spirit
of Liberty single-stage manned suborbital vehicle. (X-Prize candidate).
Aerospace is studying concepts for the Black Armadillo
manned suborbital vehicle. (X-Prize candidate).
Aerospace Technologies Inc. initiated
development of the BA-2 low-cost heavy-lift expendable launch
vehicle. The project was cancelled in 2001.
proposes to develop a ‘blastwave-pulsejet-powered’ space vehicle.
Aerospace Corp. plans to turn MX Peacekeeper ICBMs into
Eagle launch vehicles.
Technology Systems proposes to develop the Aurora reusable
manned spaceplane. (X-Prize candidate).
Systems (IOS) designed the Polaron parallel-staged expendable
launch vehicle and proposes to develop the Neptune two-stage launch
vehicle carrying the Solaris X reusable orbital spaceplane.
Space & Technology develops the Eclipse Astroliner
air-towed launch vehicle. (X-Prize candidate). This project may have collapsed.
Aerospace Corp. develops the K-1 reusable two-stage-to-orbit
Technologies (formerly Cerulean
Freight Forwarding Co.) designed the Kitten reusable manned
suborbital spaceplane concept. (X-Prize
Star Space Access Corp. (formerly Dynamica
Research) designed the Cosmos Mariner suborbital spaceplane
Inc. proposes to develop the Crusader X manned suborbital
spacesled. (X-Prize candidate).
Inc. actively develops the Scorpius family of low-cost
expendable launch vehicles.
Inc. (formely Third
Millenium Aerospace Inc.) proposes to turn a Sabre 40
jet into the SabreRocket, a rocket-powered manned reusable suborbital
Rocketplane designed the Pathfinder refuellable manned
spaceplane. (X-Prize candidate).
This project may have collapsed.
International Corp. designs the SpaceRay spaceplane. This project may have collapsed.
Company designed the Intrepid expendable launch vehicle for Universal Space Lines.
Rocket proposed to develop
the Roton single-stage-to-orbit manned reusable launch vehicle
that lands under a rotor. This project eventally collapsed in
2000. (former X-Prize candidate).
Inc. proposes a manned air-launched suborbital vehicle
released by its Proteus high altitude experimental plane. (X-Prize candidate).
America Inc. develops the Enterprise 4 low-cost heavy-lift
expendable launch vehicle. This project may have collapsed.
Access plans to develop the SA-2 ramjet powered spaceplane.
plans to develop expendable launch systems based on hybrid propulsion
concepts developed by AmRoC.
Booster Inc. (chaired by moonwalker Buzz Aldrin) proposes
to develop reusable winged booster stages.
proposes to develop the Michelle-B reusable and piloted suborbital
Inc. designs the Excalibur family of amphibious reusable
Development Inc. plans to develop the Space Cruiser air-launched
manned space plane.
proposed single-stage-to-orbit unmanned reusable launch vehicle by Lockheed Martin Skunk Works was
cancelled in 2001 and the site is now offline.