Slip, Propeller—The pitch less the distance the propeller advances during one revolution.
Stream-Line—A form or shape of detrimental surface designed to produce minimum drift.
Toss, to—To plunge tail-down.
Torque, Propeller—The tendency of a propeller to turn an aeroplane about its longitudinal axis in a direction opposite to that in which the propeller revolves.
Tail-Slide—A fall whereby the tail of an aeroplane leads.
Tractor—An aeroplane of which the propeller is mounted in front of the main lifting surface.
Triplane—An aeroplane of which the main lifting surface consists of three surfaces or pairs of wings mounted one above the other.
Tail-Plane—A horizontal stabilizing surface mounted at some distance behind the main lifting surface. Empennage.
Turnbuckle—A form of wire-tightener, consisting of a barrel into each end of which is screwed an eyebolt. Wires are attached to the eyebolts and the required degree of tension is secured by means of rotating the barrel.
Thrust, Propeller—See “Air-Screw.”