AF-7 Space Shuttle

SSTO capable of flying like a plane in Droo's atmosphere, then flying like a rocket anywhere else. Max payload is 90 tons, maybe more; don't worry if it seems slow in the atmosphere, it'll speed up once in space.

To fly: Activate AG1 for engines, and AG2 for control surfaces. Pitch up at about 100 m/s. Don't use the nav sphere with control surfaces, because the command pod is in rocket config. Next, when you reach about 25 km, activate AG7 for gyroscope, and turn off AG2 (control surfaces). From here, fly the craft like a rocket, even when landing on celestial bodies.

Landing: On any body except Droo, use the gyroscope to land on the engines gently, then use the gyroscope to lay it down on the wheels. In planets with a suitable atmosphere, you can use the parachutes (AG6) to slow down. To land on Droo, lock prograde, then activate the parachutes; this way, as soon as the craft hits atmosphere, it'll slow down. Tested up to 3000 m/s. Once you reach about 10 km, switch off the gyro, turn on control surfaces, and land like a plane.

More AGs:

AG3, crew bay.
AG4, cargo bay.
AG5, spotlights.
AG8, spotlights.