Deadstick

deadstick - descent and landing with engine(s) shut down and propeller(s) stopped.

deadstick
Flying without the aid of engine power
dihedral
The upward angle of the airplane's wings with respect to the horizontal ...

DEADSTICK - Descending flight with engine and propeller stopped.
DECALAGE - The difference in angular settings [Angles of Attack] of the wings of a biplane or multiplane.

to flight training in what they referred to as "Dead stick" school. They'd be training in one of the three light L-birds (-2,-3,-4) and as soon as they were able to fly the airplane in the normal manner they started killing the engine for deadstick ...

See also: Aviation, Dihedral, Aircraft, Altitude, Wind