Applied aeronautics; the airplane - Beeldbibliotheek

116 APPLIED AERONAUTICSRAKE—The angular deviation of the outer end of a wing from a line at rightangles to the entering edge.RELATIVE WIND—The motion of the air with reference to a moving body.Its direction and velocity, therefore, are found by adding two vectors, onebeing the velocity of the air with reference to the earth, the other being equaland opposite to the velocity of the body with reference to the earth.RETREAT— (See SWEEP BACK.)RIB—A member used to give strength and shape to an aerofoil in a foreand-aftdirection.Web—A light rib, the central part of which is cut out in order tolighten it.Compression—A rib heavier than the w^eb type and so constructed as toresist the compression due to the wire bracing of the airplane.Secondary Nose—Small ribs extending from the front sj^ar to the nosestrip (entering edge). Placed between the main ribs to give supportto the fabric near the entering edge. Sometimes called Stub Ribs.RIGGING—The art of truing up an airplane and keeping it in flying condition.RIP CORD—The rope running from the rip panel of a balloon to the basket,the pulling ofwhich causes immediate deflation.RIP PANEL— -A strip in the upper part of a ballooii which is torn off whenimmediate deflation is desired.RUDDER—A hinged or pivoted surface, usually more or less flat or streamlined,used for the purpose of controlling the attitude of an aircraft about itsvertical axis, i. e., for controlling its lateral movement.RUDDER BAR—A bar pivoted at the center, to the ends of which the ruddercontrol cables are attached.rudder bar with hisfeet.RUDDER POST—The post to which the rudder isThe pilot operates the rudder by moving thehinged, generally formingthe rear vertical member of the vertical stabilizer.SEA PLANE—An airplane fitted with pontoons or floats suitable for alightingon or rising from the water.(See AIRPLANE.)SERPENT—A short heavy guide rope used with balloons.SERVING—A binding of wire, cord or other material. Usually used in connectionwith joints in wood, and cable splices.SIDE SLIPPING—Sliding sideways and downward toward the center ofturn, due to an excessive amount of bank. It is the opposite of skidding.SIDE WALK—A reinforced portion of the wings near the fuselage servingas a support in climbing about the air])lane. Otherwise known as runningboard.SKIDDING—Sliding sideways away from the center of a turn, due to an insufficientamount of bank. It is the opposite of side slipping.a