About this Plan
PA-6. Control line precision aerobatic model.
Quote: "Cleverly blended design factors - notably engine/prop combination - make this a truly great stunt design. The PA-6, by Bob Baron.
MY first thought in designing this plane was to use the maximum allowable line length of 70 ft and to take advantage of the lower drag of .015 lines for engines of 40 and below displacement. Together with a flying speed below 60 mph, the apparent (angular) speed would be quite slow. The important trim parameters leadout sweep, center of gravity, tip weight, and handle width - were to be made easily adjustable on the field to facilitate trimming.
Several features were incorporated to reduce the physical effort of flying to the minimum. The wing was to be very rigid and to hold its airfoil, which led to an all sheet wing. Ease of maintenance and everyday handling were considered desir-able assets. Most important, the prop (10-4) would be of relatively low pitch so as not to stall under loads, and the corre-sponding high rpm would use most of the available horsepower of our present en-gines.
The resulting 50-oz ship flies at 54 mph on 70-ft lines and can be flown through every corner with no tendency to yaw or roll. The pull is moderate but very steady throughout the maneuvers. The flying speed is very nearly constant due to the low-pitch prop not stalling, as does the traditional 10-6. In the wind the low pitch tends to brake the plane. This minimizes the vicious whipping tendency that gives stunt fliers the jitters..."
PA-6, American Aircraft Modeler, July 1968.
Direct submission to Outerzone.
Supplementary file notes
Article pages, thanks to RFJ.
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