Olympia - Wakefield rubber contest model.
Quote: "The Olympia continues MAN's policy of presenting the best in Wakefield for the deidicated contest flier and the man who loves just to fly.
Probably the most interesting problem associated with this Wakefield business has to do with the torque curve of an unwinding rubber motor. A fully wound motor will develop an initial torque value equal to roughly five times that produced during the cruise portion of the run. The average torque during the burst, or first 25 percent of the unwind, turns out to be more than double that produced during the next 50 percent or cruise portion.
If we consider the cruise portion of the run as a base, we find that a moderate parasol or pylon arrangement seems to produce the greatest altitude gain, everything else being equal. It is possible to trim such a model so that it will tick skyward very nicely during the cruise portion of the unwind but as we try to move the model through the initial 25 percent or burst portion of the run with this same trim, we run into all sorts of difficulties. With the torque doubled air speed is increased substantially which then leads to increased nose up tendency due to the parasol ararngement..."
Direct submission to Outerzone.
Update 06/02/2018: added article, thanks to RFJ.
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