Electric Motors and Controllers for Use in ... - CAFE Foundation
Electric Motors and Controllers for Use in ... - CAFE Foundation
Electric Motors and Controllers for Use in ... - CAFE Foundation
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Follow<strong>in</strong>g a heart attack <strong>in</strong> April, 2004, I had time to recuperate <strong>and</strong> engage <strong>in</strong> leisure<br />
read<strong>in</strong>g. On a trip not authorized by my doctor, I had my daughter Beth drive me to a<br />
favorite magaz<strong>in</strong>e shop <strong>in</strong> Portl<strong>and</strong>, Oregon, where I purchased the current edition of<br />
Quiet Flyer, which featured Rob Honeycutt’s amaz<strong>in</strong>g Extra 330L.<br />
I was able to deduce that a 28-pound airplane that could hover had to be putt<strong>in</strong>g out at<br />
least 28-pounds of thrust. It turned out to be better than that, <strong>and</strong> I was able to conceive<br />
that these little model electric motors could power a susta<strong>in</strong>er power pack <strong>for</strong> sailplanes.<br />
Assum<strong>in</strong>g a 524 pound AUW sailplane with even a modest 25:1 lift to drag ratio, it would<br />
require only 20.96 pounds of thrust to ma<strong>in</strong>ta<strong>in</strong> altitude at its best l/d speed.<br />
San Carlos, April 24, 2009<br />
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