About this Plan
Spectrum. Control line stunt model. Wingspan 55-1/2 in, for .45 power.
Quote: "About three and a half years ago I became interested in Controline Stunt. With a great deal of help from my good friend and stunt tutor, Lou Dudka, I learned to fly the AMA Stunt Pattern. During my first contest in June 1976, I saw one of the old masters compete. Bill Simons amazed me with his rule book size maneuvers and lightning corners. Watching Bill perform motivated me to work hard toward becoming an expert flyer. By the end of the 1977 season, with lots of help from Lou and Bob Hunt, I flew my first 500 point pattern with my original design, Spectrum I.
The airplane in this article took close to two years to evolve. Applying Bob Hunt's philosophy, (Flying Models, August 1977), I decided to stay with one good design and improve it from year to year. In my case that's airplane to airplane since I build two to three airplanes a season.
The first series of Spectrums were based on the Genesis 46 (oz7572) or modern look. Later versions were designed on more classical lines, ie the Aries or Juno (oz491) look if you will. The present version, nine airplanes later, is a combination of both.
Nine airplanes of three different sizes were built. Five were 35 size, two were 40 size, and two were 46 size. For those who do not relate to the difference. I'll briefly explain. The 35 powered airplanes have 50 to 52-inch wingspans, 9-1/2 : 14-1/2 inch moments, and weigh 42 to 45 ounces. I might add that the 35 size versions fly very well. The 40-powered airplanes have a 56-inch wingspan using 10 : 16 inch moments and weigh 50 to 54-ounces. Frankly, I did not like the performance of the 40-size airplanes. The 46-size versions have 58 to 60-inch wingspans and use 10 : 16 inch moments. The 46 size airplane, built relatively light 156 to 58 ounces), and with good power, flies the best.
Having built nine Spectrums of three different sizes gave me a broad scope of what I was looking for in terms of performance. At this point in time, performance wise, Spectrum nine is my best effort.
Power and performance. When talking about the performance of a stunt ship, many of us overlook the most important trim factor we have. The motor. Bill Simons, Bob Hunt and many a good flyer will agree that a strong motor can make a bad flying airplane fly well.
My first 40-size airplane was very hard to trim out and did not fly well. Originally, it had a weak Super Tigre .46 for power. When a more powerful ST .46 was used, the airplane flew better. Finally, I ran an OS Max .40 FSR and the airplane flew much better. Spectrum nine is powered by an OS Max .45 FSR. I ran this motor from day one and the ship trimmed out the first day and flew very well..."
Quote: "Steve / Mary, I recently saw the plans of the Spectrum III (oz10161) listed. That reminded me to finish cleaning and re-sizing the Spectrum plan I had been working on. This is a 55-1/2 inch Stunter designed, flown, and built By Jim Casale. This model is the first of the Spectrum series of airplanes highlighted, beginning with the July 1980 issue of Flying Models Magazine featuring foam wings, foam core stab and elevator! The plan calls for an O.S. Max .45. I'm certain that any modern ABC FP .40 could run this plane through its paces without missing a beat."
Direct submission to Outerzone.
Update 10/07/2018: added article, thanks to RFJ.
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