Irregon (oz10998)

About this Plan

Irregon. Radio control sport model.

Quote: "Build F Crosby's 41 in Darth Vader of the skies for interceptor performance on .20 motors and three-function gear.

IRREGON STARTED LIFE as a small slope model, the configuration of which I would call a swept forward delta on which the wingtips were rigged at a positive angle of attack to that of the centre section. This model had a number of faults. High sensitivity of pitch, combined with the swept forward tips (one or other of which would dig in on landing) produced a model that was hard to fly and consequently had a short life.

One of the lads named it 'Darth Vader'. Smooth, positive pitch control was achieved by the addition of a canard wing which I linked to the elevator. The centre section of the main wing was given anhedral, the tip panels were now dihedral and their leading edges swept backwards to keep the tips out of trouble when landing.

This new look Irregon was now much nearer the state of the art as found in the military world of full size aircraft. It flew well, smoothly, accurately and was very forgiving. The next step was to draw up and built a powered version. After a word with David Boddington, Irregon Mk III was drawn up, built during the Christmas holidays, powered by a PAW19 and to my great satisfaction, flew straight off the drawing board. The name Irregon was derived from irregular polygon - 'irregon.'

Here then follows a description of Irregon MkIII, a simulated fighter interceptor. Study the drawings to assimilate the shape; become friendly with it. I can assure you this will help later when you find yourself behind the box of tricks flying it. Disorientation may be a problem at first.

The fuselage is a simple slab sided box structure which is built around the main wing; canard wing, snake runs, fuel tank, engine, control surfaces, radio cowl and finishing more or less in that order.

Construct the centre panels from 1/2 in medium density balsa and 3/8 medium for the tip panels. Commence by cutting the panels to profile and shaping to section before cutting to take the aileron snakes. The outers are tack glued with cyano into the pre-cut grooves, followed by gluing back the leading edge. I cut the snake grooves in the wings with a hacksaw blade..."

Irregon, RCM&E, February 1990.

Direct submission to Outerzone.

Supplementary file notes

Article pages, thanks to RFJ.

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