Round-the-pole flying

Round-the-pole flying (RTP) is a form of flying model aircraft, in which the model is attached via a line from its wingtip to a central support structure. Control signals can be passed to the model via wires alongside or integral with the attachment line. The operator can control the aircraft using a control console, situated outside the flying circle of the aircraft. Contrast this to control line flying where the pilot/operator stands at the centre of the flying circle and directly supports the aircraft.

RTP can be used indoors or outdoors, though usually requires calm wind conditions if used outdoors. The power source for the model is usually an electric motor, since the power can be supplied via the line and heavy batteries need not be carried. This makes it particularly quiet, clean and suitable for indoor flying. More conventional engines can be used outdoors.

The pole itself is usually a simple stand heavy enough to withstand the centrifugal forces on it. The head of the pole needs to provide a freely rotating hub, and usually incorporates a ball bearing race of some kind. In addition, where signals and power need to pass to the model, some form of slip ring arrangement is required.

Models for RTP can range from the very simple, usually converted from rubber-band powered models, to sophisticated true scale designs. The use of electric power can permit sophisticated control effects such as retracting undercarriage, operating flaps, etc. However the limited degree of freedom of the tethered model precludes the use of full aerodynamic control. Climb and descent are usually effected using variations in power to the motors.

The control console can be nothing more than a simple rheostat allowing the current supplied to the model to be varied. More sophisticated control consoles can be envisaged.

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