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The biggest obstacle facing both the new and experienced electric R/C aircraft hobbyist is the selection of an appropriate power system. In the early days of electric flight, the difficulty arose from the limited availability of suitable motors and batteries, requiring careful optimization in order to get something to work at all. That has changed, but there are now so many choices covering a wide range of aircraft from indoor to quarter?scale. MotoCalc was designed to automate much of this process. In 1997, it helped in designing optimal power systems using the few components available. Today, it does this and much more for the modeler faced with an overwhelmingly large selection of components. This article examines the problem of electric R/C airplane power system selection, and how to effectively use MotoCalc to solve it without the expense of a trial?and?error approach. A modeler powering his or her plane with a glow engine has a simple job selecting a power system. Most glow kit and ARF models have a suggested range of engine sizes, expressed in terms of displacement. For example, a model intended for a .40 to .46 cubic inch glow engine will fly with virtually any such engine. The first step in choosing a model’s power system is to know what the plane is intended to do. The performance expected of a trainer is very different than that of a pylon racer. The characteristics of the aircraft play a large role in how it can and will fly. The most significant factors are weight, wing area, wing span, and airfoil (wing cross?section) shape. Higher weights require higher speeds or more wing area in order to remain airborne. Short stubby wings have more drag but are more maneuverable than long slender wings. Determining Power Requirements, Selecting Power System Components, Using MotoCalc for Power System Selection. The MotoWizard Provides a Starting Point, For the beginning electric modeler, the MotoWizard is the place to start. Using the MotoWizard requires virtually no knowledge of motors, batteries, propellers, and gearboxes. All one has to do is enter some information about the aircraft, desired level of performance, and approximate elevation above sea level, and the MotoWizard will do the rest.
Tags : power system components, slender wings, stubby wings, glow engine, wing span, aircraft power, error approach, optimal power, electric flight, computer content, system selection, model aircraft, motocalc, arf, pylon
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