About this Plan
Eastwind. Free flight power model.
Quote: "Smooth simple lines mark this as a model for those liking looks and high performance. Eastwind, by Hoh Fang-Chiun.
Of the many branches of aeromodelling, the fast-climbing free-flight gas model is of particular interest to us. Starting with a pylon design, we first built several models from both kits and plans and experimented with satisfactory results. The many successful flights led us to think of designing a model of our own. Like all technical things, successful results, in this case a free-flight with constant contest-winning performance, can only be achieved through the right application of theory and steady practical experiments.
The Eastwind was designed in 1954 and has since undergone steady flight tests. During the past few years, eight Eastwinds have been built, of which six were for .09 (two lost on trim flights), one for .049 and one for .15 engines. Based on experience acquired during building and testing, changes in the design have successively been introduced to improve its performance.
With the ever increasing power which modern high-speed engines deliver, good free-flight designs must be able to utilize all the power which these mighty powerplants develop. A steep, rocket-climb followed by a slow-sinking floating glide is the pre-requisite in order to have any chance in gaining a top place in today's hot free-flight competitions. The wing air-foil is one of the keynotes in today's free-flight. A low-drag, high-lifting airfoil is most desirable. Of all the airfoils known, a thin, sharp leading-edged, flat-bottomed Clark Y type probably offers the least drag. This is important in order to gain as high an altitude as possible during the limited power flight. But, practical experiences show that an undercambered airfoil, although offering a higher drag during the climb, would permit a slower floating glide and a greater ability of catching a thermal..."
Quote: "Hoh Fang Chiun was a prolific designer in all categories and this simple design shows some of his skills."
This plan was printed in Flying Models Decade of Designs (1), published 1960.
Direct submission to Outerzone.
Update 19/01/2017: added article, thanks to RFJ.
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