spinoff: lovely gift for your favorite pilot
. . . self-washing helicopter. While he's away, drill into the two rotor hubs (they're up at the very top on each side).
Screw in a y-adapter for garden hose, with rotating joint. Suspend hose from handy tree to keep it out of the way of rotor.
Drill 10 small holes in bottom of each blade so the water can squirt onto the helicopter.
Turn on water. Start engine. Self-washing helicopter.
He'll be speechless!