Half Alpha - Free flight power model.
Quote: - "A few days after the new free-flight power loadings were announced, Half Alpha came off the workbench. Although designed specifically for the new loadings, Half Alpha is a direct descendant of an .09 Torpedo-powered model flown under the Class A banner. After more than 20 months and many refinements, that fourth, final, Class A model proved contestworthy. During the latter part of the 1958 season, nearly 88% of its official flights were maximums. Needless to say, the next step was to work up a 1/2A configuration with these same attributes.
A 310 square inch wing area was decided upon. This 3.9 ounces per square foot wing loading compares favorably with that of other, high performance free flight models. Yet the drag is low enough so a Thermal Hopper is still capable of hauling the model upstairs. The 45% stabilizer was retained with flat-bottom wing and stab airfoils and 1-1/2 degrees decalage (angular difference between wing and stab). Nose and tail movement arms were adjusted accordingly..."
Half Alpha, MAN, July 1959.
Direct submission to Outerzone.
Article pages, thanks to RFJ.
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