(No. 1 in diagram.)
Pitch, Propeller--The distance a propeller advances during one revolution
supposing the air to be solid.
Pitch, to--To plunge nose-down.
Reaction--A force, equal and opposite to the force of the action producing
it.
Rudder--A controlling surface, usually hinged to the tail, the operation
of which turns an aeroplane about an axis which is vertical in
normal horizontal flight; causes an aeroplane to turn to left or
right of the pilot.
Roll, to--To turn about the longitudinal axis.
Rib, Ordinary--A light curved wooden part mounted in a fore and aft
direction within a surface. The ordinary ribs give the surface
its camber, carry the fabric, and transfer the lift from the fabric
to the spars.
Rib, Compression--Acts as an ordinary rib, besides bearing the stress
of compression produced by the tension of the internal bracing
wires.
Rib, False--A subsidiary rib, usually used to improve the camber of
the front part of the surface.
Right and Left Hand--Always used relative to the position of the
pilot. When observing an aeroplane from the front of it, the
right hand side of it is then on the left hand of the observer.
Remou--A local movement or condition of the air which may cause
displacement of an aeroplane.
Rudder-Bar--A control lever moved by the pilot's feet, and operating
the rudder.
Surface--See ``Aerofoil.''
Surface, Detrimental--All exterior parts of an aeroplane including
the propeller, but excluding the (aeroplane) lifting and (propeller)
thrusting surfaces.
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