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- Type: SPH
- Class: Spaceplane
- Part Count: 66
- Stock: Yes
The Aran Aviation Terra One is an SSTO spaceplane designed to ferry 6 kerbals to 200km x 200km LKO and safely return them to Kerbin, while maintaining a flexible aerodynamic performance envelope. The Terra One features two J-4X
Whiplash turbojets, providing a grater than 1 thrust to weight ratio in nearly all regimes of flight. A single LV-T45
Swivel rocket engine provides for all vacuum and high atmospheric burns, providing the best efficiency at a wide range of atmospheric pressures. Equipped for the most extreme aerobatic manoeuvring at both subsonic and supersonic speeds, the Terra One’s twin tail system ensures constant yaw authority in 10g manoeuvres at altitudes of up to 20km.
Quick Reference Guide
Take-off Operations (assumes zero inclination target orbit):
- Activate jet engines through staging. Accelerate to 70m/s and rotate the craft gently. With positive rate of climb, gear up.
- Climb to 10km altitude and level out to ensure that the craft goes supersonic. The J-X4 “Whiplash” turbojets will only be able to properly accelerate the craft when the craft surface speed is greater than 350m/s
- Engage SAS, allow the craft to climb naturally through to 15km altitude, or until the craft reaches 900m/s. The craft is not safe for extended operations below 15km at speeds greater than 900m/s and should be avoided. Pitch to 15 degrees and hold.
- At 22km, engage the rocket engine through staging or action group 2. Allow SAS to hold the craft stable and do not attempt to correct the AOA until orbital speed reaches 1600m/s. At turbojet flameout, use action group 1 to secure the jet engine system.
- At 1600m/s reduce Angle of Attack (angle between nose and prograde marker) to 5 degrees. Continue until 1800m/s orbital speed.
- At 1800m/s engage the prograde autopilot. Continue accelerating until the craft reaches target AP
- Use short engine bursts or the RCS system to maintain target AP. Coast to AP and circularize.
- Half an orbit before you pass over your target landing site, perform your deorbit burn to set your PE to 20km.
- As soon as the craft passes through 70km altitude, set the craft facing pro-grade and pitch up to 40 degrees Angle Of Attack. Attempt to hold this orientation until the end of re-entry heating.
- Re-entry performance is highly dependant on craft mass. If you have excess fuel and oxidizer remaining, pump them evenly into the forward nacelle tanks for optimum stability. If holding the nose of the craft up is proving difficult, pump the fuel to the rear most tanks.
- As soon as the craft surface speed drops to 1300m/s the craft is safe to manuver. Use any combination of turns or lower AoA to either slow down, or maintain speed as needed to reach the target landing site.
- Do not drop bellow 20km altitude at speeds greater than 900m/s.
- As the craft nears 1km above ground level, use flaps as required to slow the craft to 80m/s while maintaining a steady rate of decent. Avoid using flaps if attempting a landing with no engine power (dead-stick). Slow to 60m/s for your final decent.
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