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Old Oct 26, 2002, 02:38 PM
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Gaithersburg, MD, USA
Joined Jun 2000
1,070 Posts
Electric Propulsion Data

See www.fmadirect.com Click on Support then scroll to Applications Notes. Take a look at Exhibit 9 that is set up for the range of users. I am working on an AN specifically for model airplanes. It is intended to set up "footprints" for various power combos. We will shortly provide a Li Poly Calc that lets you select battery combos for whatever current drain and throttle position you choose. The major inputs are current and throttle position. However, it is a chore to relate that to theroretical airplane performance. It will help greatly to have enough known performance data for as many airplane- propulsion combos as practical. This will permit empirical estimation of what it takes to fly, e.g. a TM. These data will be for simple GO-NO-GO; i.e., an Ellipstik flys OK with (describe propulsion package) on current draw of XX amps.
In the meantime, please provide all the info you can for a scatter-gram that shows where the available propulsion set lies on the chart. Please be sure to specify the things that relate to current draw: motor, gear ratio, prop size, and prop pitch. Let's start filling in the boxes: One for micro; one for 280-300 geared and direct; one for 400 geared and direct; and one for the big stuff. In due time, let us overlay experience with brushless. When we have all this done, it becomes a simple matter to size everything. Don't be shy, but please keep it to input, not questions that make the thread go on forever.
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