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Interorbital
Systems (IOS) is developing the first of a new generation of low-cost,
rapid-response manned
orbital launch vehicles: the Neptune TSAAHTO
(Two-Stage-and-a-Half-to-Orbit). The Neptune TSAAHTO is designed for minimum
cost and maximum reliability. Unnecessary expensive, complex,
failure-prone, and sometimes performance-limiting systems such as wings
and turbopumps have been eliminated from the design. Since the Neptune TSAAHTO is designed to be
deployed from the ocean, launch costs will be insignificant (compared to
standard spaceport fees), and launch scheduling will be based on customer demand
(not on placement in a spaceport's launch rotation).
Neptune TSAAHTO
The
manned Neptune TSAAHTO’s dual-use (habitable when empty) pressurant tank is its most innovative design feature. Once on-orbit, an expedition
crew will transfer to the rocket’s specially equipped pressurant tank
through a hatch in the Crew Module's heat shield. During
the mission, the 14-foot (4.27-M) diameter by 20-ft (6.1-M) long tank will provide the crew with
an enormous living, recreational, and work area, with both private and
group activity zones. The expedition crew will experience spectacular
Earth and space views through numerous observation ports, while enjoying
weightlessness to the maximum.
Two-Stage-And-A-Half-To-Orbit (TSAAHTO): The Sea Star TSAAHTO is a pressure-fed, two-stage-and-a-half-to-orbit launcher. It has a configuration similar to the Atlas Agena. Half-staging is equivalent to dropping unused ballast. Overall, the TSAAHTO is less complex, and therefore safer and more reliable than any other launch vehicle to date. The Neptune TSAAHTO is designed to place a 7,000-pound payload into a 250 mile 51º orbit. The three main components of the rocket are the Booster Module (BM), the Orbital Station Module (OSM), and the Crew Module (CM). Liquid Rocket Engines and Propellants: The Neptune TSAAHTO's primary propulsion system consists of eight common, fixed, high-thrust liquid Booster/Sustainer engines. Differential throttling of the Booster/Sustainer engines will provide pitch and yaw control. Auxiliary forward on/off thrusters will provide roll control. The OSM is powered by the Sea Star TSAAHTO propulsion system. Storable, high-density white fuming nitric acid (WFNA) and Hydrocarbon-X (HX) are the rocket’s primary propellants. These storable, environmentally friendly propellants provide reliable, efficient, hypergolic ignition. Crew Module (CM): The CM is designed to accommodate five expedition crew members and one command pilot. The 6-person crew will be seated radially around a centrally located service compartment access hatch. Each crew member has a window providing excellent visibility. The CM is attached to the forward section of the rocket and has the following primary components: emergency escape system, life-support system, electric power system, docking collar, retro-rocket de-orbit system, attitude control system (ACS), parachute recovery system, aft heat-shield for reentry.
Crew Module Escape System:
The
CM is equipped with set of four aft-mounted liquid rocket engines. In the
event of a catastrophic failure a major rocket system at the launch site,
or anywhere along the launch trajectory, the escape rockets will boost the
CM away from the launch vehicle. In this event, the CM is designed to land in the ocean by parachute and to be
recovered.
Floating Sea-launch:
Neptune TSAAHTO launch
operations will be carried out at sea.
Launching
a rocket at sea is the most economical method for launching
payloads into orbit. It eliminates the tremendous costs and
scheduling bottlenecks associated with using the existing land spaceports and
airports. Launches can be scheduled according to the customer’s
requirements. Other advantages include: 1) Launch
positions can be selected from a nearly infinite number points around the world 2)
Ocean launch
systems are portable 3)
Launch
insurance costs are substantially lower 4)
Vehicle recovery operations
are simplified 5)
Federal
launch licenses are easier to obtain IOS will stage its launch operations from Port of Long Beach, California. Initial launches will take place from the Pacific Ocean West of Long Beach.
Interorbital
Systems P.O. Box 662 Mojave, CA 93502-0662 |