Oscillator (oz8072)

About this Plan

Oscillator. Radio control sport model. 336 sq in wing area, weight 3-1/4 to 3-3/4 lbs. Wing loading 24oz. For OS .19 or S/T .23 power.

Quote: "A lively stunt ship and a test bed for a single-channel decoder was the design target for this single channel machine. The first target was met as stunt it will with the best using the decoder. The Oscillator, by Bob Karlsson.

This ship came about for two rea-sons. First, the designer wanted a lively .19 size stunt ship in which he could use his single channel decoder system (April 1966 MAN, also see May 1967 MAN, for simultaneous motor control) and second, with no kits on the market in this category with symmetrical wing sections, something had to be designed.

Remembering the excellent flying qualities of Dick Allen's Stark Shark (oz7758) as either a Class III or Class II ship, Bob laid out the exact same force set-up, also using the Shark's wing and stabilizer sections. While doing this, he scaled the whole thing down for the smaller engine. Finally, he added the outside lines which gave the Oscillator its particular shape.

Of special interest is the underfin and full depth rudder, also a mark of the Oscillator's Shark parentage. This provides the ship with the ability to per-form aileron-like rolls and a fair measure of inverted flying stability.

The thick wing and stab sections are reminiscent of a popular hand-launch glider airfoil, in which the top surface is perfectly flat from the high point to the trailing edge. Of course, with the symmetrical section, the same pattern is repeated on the bottom. If nothing else, it certainly makes construction a lot easier.

On the Oscillator, the thick section and the high wing loading result in a rather rapid sink rate in dead stick or very low throttle, making it dandy for getting into small fields. It has no trouble getting out, either. In spite of the sink rate, forward speed in landing is quite slow without danger of sudden stalls.

The sub-rudder also makes itself known in slow, nose high flight, giving excellent control right up to the stall point..."

Direct submission to Outerzone.

Update 28/09/2016: Added article pages, thanks to RFJ.

Supplementary file notes

Article pages, text and pics.

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