KerbalX

Changes from Block 10
Since this booster is 3 Kerbol 9 cores attatched togheter, this booster is 3 Kerbol 9 Block 11, and carries the same improvements.
Also added more explanations on the flight manual.
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Kerbol Heavy Block 11

Fully reusable booster with a payload of 56 tons to an 80 km orbit around Kerbin. Since the vanilla/stock game doesn’t allow to switch vehicles inside the atmosphere, the booster delivers the payload to a circularized orbit and then performs reentry (See Flight Manual for details). The design philosophy comes from this constrain. Inspiration came from the Falcon Heavy rocket.
This is basically two Kerbol 9s attached around a Kerbol 9 core. Therefor flying characteristics are almost the same.
I’m relative new to KSP, but I wanted to share it and I wanted the booster to be easy to use to new players too.
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Kerbol Heavy Block 11 Flight Manual

1) Press “T” to activate Stability Assist “SAS” and press “Z” for full throttle. Then spacebar to launch
2) Mantain vertical ascent, and keep speed under 200 m/s below 8 km
3) Full throttle after 8km and keep vertical ascent
4) At 16 km rotate to 45°. If the payload is giving control issues, the Reaction Control RC can be activated.
5) At 35 km or when apoapsis is 60 km, rotate to 0° (horizontal)
6) Cut engines when apoapsis is 80 km
7) Circularize orbit and release payload (Now you have 2 ships, 3 boosters and payload. After releasing payload you have to press space bar to separate the boosters and land them individually. They are just 3 Kerbol 9 boosters. Next steps will cover booster reentry)
8) Put the booster in retrograde and select a flat place to land. Perform the burn to bring the booster to the atmosphere
9) Press number “1” to deploy the airbrakes. It is recomended to do the reentry sideways at 90°. The booster will stabilize itself, without SAS active, during reentry.
10) Deploy parachutes when speed is below 300 m/s and press “G” to lower the landing gear. Before touching down, activate the Reaction Control “RC” and SAS. The landing lights can be used to check ground proximity. To activate them press number 2. When the ground starts to be iluminated with a red glow, it’s time to activate RC and SAS.
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Flight Envelope

-Payload is set to 56 t maximum to give new players room for error
-Payload must be firmly attatched to avoid control problems
-Never Exceed Speed during reentry: 2500 m/s (tested up to 2600 m/s)
-Reentry can be done at any angle, even with the booster tumbling out of control. Assuming worst case scenario (no fuel, no RCS and low battery); with the airbrakes deployed, the booster will stabilize itself during reentry to a tail forward position for landing.
-Booster can land with fuel reserves (tested with reserves after an empty payload flight)
-Stable landing can be guaranteed in terrain inclinations up to 10° maximum (higher inclinations can be achieved by transfering all the fuel to the lowest tank, but it’s not guaranteed)
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A stock rocket called Kerbol Heavy Block 11 (Payload 56t). Built with 352 of the finest parts, its root part is HECS2.ProbeCore.

Built in the VAB in KSP version 1.8.0.

Details

• Type: VAB
• Class: ship
• Part Count: 352
• Pure Stock