Kronus BT-1 "A-Wing B"
by Kronus_Aerospace
uploaded 2017-12-22
94 downloads /
5
points
SPH
stock spaceplane
#ssto #replica #stock

Description

A stock aircraft called Kronus BT-1 A-Wing B. Built with 127 of the finest parts, its root part is Mark2Cockpit.

Built in the SPH in KSP version 1.3.1.

Details

  • Type: SPH
  • Class: spaceplane
  • Part Count: 127
  • Pure Stock

-Basic Description

This craft is an SSTO made in the style of the A-Wing from the Star Wars Franchise. this vessel was made as a kind of alternate version to my A-wing jet fighter https://kerbalx.com/Kronus_Aerospace/Kronus-BD-1-A-Wing , and follows a similar design philosophy. With this craft i was unfortunately unable to recreate it’s predecessor’s sleek design, mainly because said design resulted in the craft having absolutely aweful aerodynamics. While this craft’s design is far more streamlined (atleast, in the game’s version of streamlined), it still suffers heavily from drag, a fact which is evident in it’s flight profile. This craft features a full set of translation only RCS thrusters which have the equivalant monopropellant of around 200 m/s of Delta-V. This is important as this craft reaches an 80 kilometer orbit with only around 10 m/s of Delta-V worth of LFO. This craft can safely reach and dock with a space station in a 125 kilometer orbit and still have enough fuel to deorbit, attempting to do this in a higher orbit will risk you running out of monopropellant, assuming you don’t refuel at the target space station of course. This craft has very little control authority during launch, but by the time the fuel is drained for reentry it becomes substantially more maneuverable. The craft does feature a probe core, so it could feasibly be used as an orbital shuttle for kerbals around LKO. Interestingly, while this craft only half the size of it’s predecessor, it is actually nearly twice it’s mass.

-Flight Profile

Take off: Activate the engines and rotate at 65 m/s, allowing the craft to reach a higher speed on the runway will result in it becoming highly unstable, so taking off as early as possible is vital.
Assent: After takeoff immediately pitch up to 35 degrees and hold, at 8-8.5 kilometers in altitude tell SAS to hold prograde until the craft levels out then switch back over to Stability Assist mode, at this point the craft should be at 10 kilometers in altitude. Once the craft reaches 1100 m/s pitch up to 10 degrees, the craft should reach a maximum speed of just under 1450 m/s. At 28 kilometers toggle the R.A.P.I.E.R.s over to closed cycle mode and accellerate into orbit.
Orbital maneuvers: The craft should be just about out of oxidiser at this point. All maneuvers will then be accomplished by the RCS system
Landing Back at the KSC: The craft will have an excess of about 30-50 units of liquid fuel to ease this process. Due to the high drag this craft experiences, most of your approach to the KSC shoud be done at high altitudes, once you get within about 15-20 kilometers in horizontal distance dive down to approach the runway. this craft has excellent glide characteristics so try to land on the runway at speeds below 60 m/s.

-Flight Information

-Rotation Speed: 65 m/s
-Max Ascent Speed (Jet Mode): ~1445 m/s
-LKO Delta-V: 200 m/s
-Max Safe Orbit (No Refueling): 125 Kilometers
-Maneuverability: Very Low-Normal
-Stall Speed (Empty): 20 m/s

-Known/Development Issues

This craft initially only had two R.A.P.I.E.R.s which gave the craft a TWR of 0.8, for most SSTOs this would have been more than enough, but the substantial drag this craft experiences meant that this wasn’t enough to accellerate the craft even at high altitudes, hence the addition of a third engine and this craft’s high TWR.

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