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FINAL APPROACH

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Designing Round Engines Low vibration, small size, big power! The 44cc engine is compact enough to fit completely within the cover of a ? -scale Mustang. My test aircraft is a biplane, of course! Carl Risteen-aeronautical engineer, model designer and admitted biplane junkie-has written for Model Airplane News on topics such as flutter and the unique aerodynamics of biplanes. In his latest endeavor, he has been designing and building rotary engines for models, UAVs and...

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