SMALL - Telemetry SMALL - Radio
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Old Jul 11, 2015, 05:10 PM
mikeflyz is offline
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Westlake Village, California
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I was following a suggestion from one of my friends to skin only the upper surface. It is only to decrease thrust requirements. Yes, the open lower wing structure will have a drag penalty, but at low indoor speeds, the induced drag savings of a single surface wing is a little greater than the parasite drag penalty caused by the exposed lower wing structure.

Once I double-surfaced a peanut-scale moth and it was nearly unflyable.
My next project was the Waco, with only an upper surface (same power loading as the moth) and it was much better. So, the concept has stuck.
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Old Jul 11, 2015, 05:12 PM
LowlyElevated is offline
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Team PeasantCopter... kind of.
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United States, FL, DeLand
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It probably turns the wing type into more of an undercambered airfoil as opposed to symmetrical or flat-bottom. An undercambered wing generates more lift, but has the penalty of drag. Which, really isnt too much of a penalty on indoor flyers because you want it to stay as slow as possible.
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Old Jul 11, 2015, 07:13 PM
BryanEW710 is offline
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Quote:
Originally Posted by mikeflyz View Post
I was following a suggestion from one of my friends to skin only the upper surface. It is only to decrease thrust requirements. Yes, the open lower wing structure will have a drag penalty, but at low indoor speeds, the induced drag savings of a single surface wing is a little greater than the parasite drag penalty caused by the exposed lower wing structure.

Once I double-surfaced a peanut-scale moth and it was nearly unflyable.
My next project was the Waco, with only an upper surface (same power loading as the moth) and it was much better. So, the concept has stuck.
Interesting! There so so much about micro aerodynamics that I don't know
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Old Jul 14, 2015, 12:50 AM
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the main gains are your weight saving.... and improved lift from the open under cambered wing
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