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Model XP Sub-System
The XP cabin is designed for safe, enjoyable space travel. XP features
room for 3 passengers
and a pilot with one passenger sitting up front along side the pilot and
2 passengers in the aft seating area. Each seat features a 5-point harness
system to ensure that the passengers are secure during high-G portions
of the flight. Passengers also have an intercom system to hear the pilot
and speak with each other, as well as monitors where they can view the
external and internal cameras and view position and trajectory information
as well as flight milestones.
The Rocketplane® XP is designed to operate on both turbojet and rocket
REACTION CONTROL SYSTEM (RCS):
For exoatmospheric maneuvers, XP has a Reaction Control System (RCS) consisting of 12 cold nitrogen gas thrusters placed in opposing pairs so that they can change XPs attitude in all 3 dimensions. The RCS system, provided by Space Vector Corporation, is in three segregated zones any two of which allow full control authority, allowing system fault tolerance. The RCS will be used to orient the XP to give the passengers different views through their windows and to maintain proper orientation during reentry.
FLUSH AIR DATA SYSTEM (FADS):
XP’s Mach 3.5+ flight profile makes it problematic to use the typical aircraft external probes and sensors to determine the pressure, airspeed, air density, alpha, and stall warning. Rocketplane and Utah State University teamed on an all new, patented, Flush Air Data System or FADS. This system uses an array of flush mounted sensors to calculate the values that would have been produced by a typical instrument set and is functional to hypersonic speeds.
FLIGHT CONTROL SYSTEM (FCS):
XP features an advanced, all electric, fly-by-wire flight control system with an elevon and aileron on each wing, and all-moving tail “V-Tail”s. Pilot inputs are fed through triply redundant flight control computers which determine the rate commands for the flight controls. The electromechanical actuators operate on 270VDC power and feature internally redundant drives, and redundant cross over actuator controllers.
ELECTRICAL POWER SYSTEM:
The XP spends much of its time flying either exoatmospherically or in glide as it returns to base. During these portions of the flight it will have no running jet engines to run generators or other power producing devices and therefore uses stored energy systems. For this purpose the XP is equipped with a series of large Lithium Ion batteries. These batteries provide power to XPs systems at 28volts and 270volts Direct Current (DC). The electric flight control actuators use the 270VDC while the computers and other systems use the 28VDC. The Lithium Ion power system is redundant and fault tolerant and is designed to be recharged onboard the plane.
GUIDANCE, NAVIGATION & CONTROL (GN&C):
Rocketplane XP features an advanced fault tolerant GN&C system being developed by bd Systems. The Avionics system receives data from the Flush Air Data System (FADS), Global Positioning System (GPS), and an Inertial Navigation System (INS) and is tolerant to loss of GPS signal and signal reacquisition. Pilot inputs are taken from electrical stick, throttle, and pedals and are used to determine rate commands to the electromechanically actuated flight control surfaces and if necessary the RCS. The XP is a partially autonomous vehicle and from rocket ignition to atmospheric reentry, the triple redundant flight computers run both closed and open control loops to maintain the required flight.
DAS & IVHMS:
XP features a Data Acquisition System (DAS) being built by ARINC, that collects data from hundreds of sensors placed throughout the vehicle and stores it onboard the vehicle as well as transmits it to the ground. This data is used for an Integrated Vehicle Health Management System (IVHMS) in which the computers onboard XP look for anomalous behavior from the vehicles systems and structure and attempt to diagnose what maybe causing the undesirable readings. If there is any concern, the IVHMS can warn the pilot immediately. The IVHMS will also allow ground staff to determine if a system appears to need routine maintenance or repair. This system makes XP safer to fly and saves valuable time and parts cost, by servicing parts before they fail, and by knowing which areas require service, rather than undertaking exhaustive gremlin chasing between flights.
The XP will be unique amongst aircraft in that it will be the first to ever take off on its own landing gear, go into space, and then return and land on its own gear again. Also to lower the weight of the system the gear will raise and lower using pneumatics rather than hydraulics. The XP uses landing gear from a 30 series LearJet, providing a high maximum take off and landing weight.
THERMAL PROTECION SYSTEM (TPS):
When the XP reenters Earth’s atmosphere the leading edges of the wings, tails, flight control surfaces, and nosecone will experience temperatures in excess of 600-700F. These surfaces are made of titanium which is not only very temperature resistant but light as well. The rest of the vehicle is covered in a special ceramic paint that emits over 93% of the energy it receives. In select areas such as near the rocket engine, ceramic blankets will be used to protect the fuselage from not only the heat of reentry, but also the heat produced by the rocket engine.
Incredible Adventures: Making Dreams Come True Since 1993
Incredible Adventures - 6604 Midnight Pass Rd - Sarasota, FL 34242 - email - ph: 941-346-2603 - fax: 941-346-2488
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