Outrigger--This term is usually applied to the framework connecting
the main surface with an elevator placed in advance of it. Sometimes
applied to the ``tail-boom'' framework connecting the
tail-plane with the main lifting surface.
Pancake, to--To ``stall ''
Plane--This term is often applied to a lifting surface. Such application
is not quite correct, since ``plane'' indicates a flat surface,
and the lifting surfaces are always cambered.
Propeller--See ``Air-Screw.''
Propeller, Tractor--An air-screw mounted in front of the main lifting
surface.
Propeller, Pusher--An air-screw mounted behind the main lifting surface.
Pusher--An aeroplane of which the propeller is mounted behind the
main lifting surface.
Pylon--Any V-shaped construction from the point of which wires
are taken.
Power--Rate of working.
Power, Horse--One horse-power represents a force sufficient to raise
33,000 lbs. 1 foot in a minute.
Power, Indicated Horse--The I.H.P. of an engine is a measure of the
rate at which work is done by the pressure upon the piston or
pistons, as distinct from the rate at which the engine does work.
The latter is usually termed ``brake horse-power,'' since it may be
measured by an absorption brake.
Power, Margin of--The available quantity of power above that necessary
to maintain horizontal flight at the optimum angle.
Pitot Tube--A form of air-speed indicator consisting of a tube with
open end facing the wind, which, combined with a static pressure
or suction tube, is used in conjunction with a gauge for measuring
air pressures or velocities.
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