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Model Aircraft Glossary


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Tab

A small adjustable surface on wing or tail surfaces, used to make small trim changes.

See also: Trim Tab.


Tachometer

An optical sensor designed specifically to count light impulses through a turning propeller and read out the engine rpm (revolutions per minute). This is useful when tuning an engine or matching the throttle and tune on multi-engined aircraft.


Tail

The surfaces (tailplane and fin) at the rear of a conventional aeroplane fuselage.Lightened tailThe photograph shows a tail that has been lightened by cutting substantial holes in the main surfaces. Care should be taken as over lightening may result in the tail surface failing in flight. Note that circular holes have been cut as they are the best in terms of avoiding stress raisers that may lead to the balsa wood cracking.


T-Tail

Arrangement where the tailplane is mounted on top of the fin.


Taildragger

An aircraft which has an undercarriage arrangement where the mainwheels are under the wing with smaller wheel at the tail end of the fuselage. The aircraft sits on the ground with a nose-high attitude.

See also: Three Point Landing.


Taileron

A mixture of elevators and ailerons. On a delta wing the elevators and ailerons are mixed and known as elevons. However, as well as normal airlerons the tailplane horizontal surfaces may be mixed to form elevators and ailerons and hence enhancing the normal roll control provided by the ailerons.

See also: Ailerons, Elevators, Elevons.


Tailplane

See also: Airfoil Section, Fuselage, Fuselage Construction, Wing Construction, Wing Covering.


Tailskid

A fixed angular fixture use to support the tail end of an aircraft on the ground instead of a wheel.


Take Off


Tandem Winged

An airplane with wings of similar size mounted one in front of the other, on pretty much the same level.


Tapered Lap Joint

See also: Joints.


Target Tug

An airplane used to tow objects, or targets, fired at by other airplanes or anti-aircraft guns for practice.


Template

A stiff pattern for marking the outlines of pieces to be cut from sheet wood or metal.


Thermal

A rising column of relatively warm air.


Threads

See also: B. A. Threads.


Three Point Landing

Three Pointer

With a tail dragger there is an art in landing with all three wheels touching the ground at the same time.


Thrust

The propulsive force developed by a driven propeller or jet engine.


Thrust Line

An imaginary line drawn along the propeller shaft and extending rearward through the aeroplane.


Timer

A lightweight clockwork or electronic device fitted to free-flight aircraft to operate in-flight systems and to control the dethermaliser.


Tip Loss

Reduction in lift near the tips of wings due to the leakage of the high-pressure air from beneath to the low-pressure area above.


Tip Stall

The outboard end of one wing stops developing lift, causing the plane to roll suddenly in the direction of the stalled wing. This situation is not fun when you are only a few feet off the runway trying to land.


Tools

Hand and machine tools with descriptions and reviews. more...


Top Rudder

Rudder used when an aircraft is flying on its side to keep the flight path horizontal.


Torque

The reactive force generated by a revolving propeller that tends to rotate the aeroplane in a direction opposite to the direction of the propeller rotation.


Torque Meter

A device used when winding the rubber motor of a free-flight aircraft that measures the torque stored in the motor and thus enables the maximum energy to be stored in it.


Torque Roll

An aerobatic manoeuvre that uses the torque reaction to accelerate the rate of roll of an aircraft.


Touch-And-Go

Landing and taking off without a pause. Useful to practise when learning to fly.


Towhook

A hook fixed to the underside of a glider fuselage for attachment of the towline.

See also: Aerotow.


Towline

The launching cord used for pulling aloft a glider or sail plane.


Tracker

A lightweight radio transmitter carried by some free-flight aircraft to aid their location by means of a highly directional receiver.


Trailing Edge

The rear edge of a wing or tail surface.


Trainers

There are a number of requirements for the basic trainer aircraft. Points to consider whether you are designing, constructing or choosing are outlined along with some of the most popular kits on the market. more......


Trainer System ("buddy box")

This method of training allows two transmitters to be connected by means of a trainer cord. The instructor can pass control over to the student's transmitter so that he can fly. If the student gets into trouble, the instructor can regain control instantly.


Transmitter (TX)

The hand-held radio controller. This is the unit that sends out the commands that you input.


Tricycle Undercarriage

An undercarriage arrangement where the main wheels are set under the wing just behind the cog point, with the third wheel positioned under the nose just behind the engine. The aircraft sits on the ground with the fuselage level.


Trim Tab

Trim tabA small auxiliary surface hinged on an airplane's control surfaces, used to bring it into balance or trim. This may be as simple as a small metal tab on the trailing edge of an elevator that is set to trim the aircraft for horizontal flight.


Twin Engines

There are a number of variations on the twin engined aircraft. An example given here uses a single engine and a flexible drive to turn two propellers. more...


Two-Stroke Engine

The two stroke engine has been the main stay of powered model aircraft for a number of years due to the high power to weight ratio. The main downfall of the two-stroke engine is the high fuel consumption. The basic construction, operation and general notes on starting, running and maintaining are all included within this section. more...


A B C D E F G H I J K L M N O P Q R S T U V W X Y Z