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Prop Boosted Rocket (PBR)

This was a crazy idea, but it works and saves a ton of fuel!

Controls:
shift/ctrl: main engine throttle and rotor torque
i/k: adjust blade pitch on ascent/descent

To fly:
1) Engage SAS, and for hands free ascent set target orientation to radial out (and remember to change it back later).
2) Press shift to increase rotor torque - you don't need a lot, three notches on the throttle is good.
3) Adjust blade pitch if you want to ascend faster, but the default is fine!
4) Climb above 10,000 meters, decrease rotor torque (or hit the brakes), then active the rocket stage.
5) Switch vessels ('[' or ']') to fly the booster or take the rocket into orbit.

The reusable prop booster stage can fly and land pretty nicely, but you have to find the right mix of rotor torque and blade pitch! If you like my designs consider subscribing to my channel to show your support!