KH-2/C Momentum
by Spyke
uploaded 2017-08-06
(updated 2017-11-11)
mod spaceplane
#opt #ssto #spaceplane #cargo #superheavy


  • Type: SPH
  • Class: spaceplane
  • Part Count: 85
  • Mods: 4

Agile, high TWR super-heavy SSTO spaceplane.

Rated for 100 ton paylod to Kerbin synchronous orbit (2,863 km). 12m x 3.75m cargo bay capacity.

2017-08-07 : Quick update, added additional RCS ports on the nose for pitch control during reentry, action group 3. Added monopropellant and electric charge. Refitted stabilizers.

Take-off to orbit instructions :

1- Throttle 100%, stage and let the engines spool up to ~250kN
2- Stage, then let the aircraft accelerate all the way to the end of the runway. May not be necessary if payload is light enough.
3- At the end of the runway, pitch up and set attitude to a ~35° climb. Gear up.
4- At engine ionization (700kN thrust/engine), progressively reduce pitch to a level flight. Keep Ap under 27,000m and over 25,000m
5- Gather horizontal speed. Increase altitude as the nose heats up.
6- At 100kN thrust/engine, stage, then progressively pitch up. Do not exceed 20° angle of attack. Use action group 1 to cut off Nebula engines and close intake ports to reduce drag.
7- Past atmospheric height, proceed to desired mission parameters. Turn on fuel cell with action group 10.

Orbital maneuvers notice :

With or without a payload, the craft has an offset thrust. Reaction wheels are enough to keep the craft at any desired vector but will quickly drain batteries ; make sure the fuel cell is running. Turn on RCS before an orbital burn as a precaution, it can be turned off mid-burn. Use SAS-Nodes to stabilize the craft in space.

Reentry procedure :

1- Set Pe to 25,000~28,000m, over the ocean west of the KSC.
2- At 70,000m altitude, orient craft at a 20° angle of attack. Turn on RCS.
3- During reentry, watch SAS control inputs. The craft may flip, so pitch down preemptively. Keep AoA to 20~30° during reentry heating.
4- Apply airbrakes under 800m/s until subsonic flight.
5- If fuel still available, keep airspeed to 200m/s until final approach.
6- At final approach, apply airbrakes, apply throttle to keep at least 75m/s and touchdown.

Using OPT Spaceplane Parts 2.0.1.


  • Orbit Portal Technology [OPT] Spaceplane Parts (Legacy)
  • Squad (stock)
  • TweakScale - Rescale Everything!
  • opt
Note - Not all the parts of this craft were detected
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