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Old Nov 03, 2010, 01:07 AM
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United States, TX, Austin
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Idea
vortex generators on Stryker?

I flew my Stryker for the first time, and was wondering, would putting vortex generators on the wings help with it's low speed handling? I would think they would help keep the airflow attached at low speeds and help make it less finicky. I'm especially wondering this because for now, I'm flying mostly in that part of the flight envelope.
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Old Nov 03, 2010, 04:55 AM
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Peter M's Avatar
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Have a look at Post 22 of http://www.rcgroups.com/forums/showt...1314697&page=2
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Old Nov 03, 2010, 11:39 AM
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http://www.rcgroups.com/forums/showt...light=vortilon
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Old Nov 03, 2010, 06:58 PM
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thank you but neither of those are what i'm talking about, here is what I mean: http://www.centennialofflight.gov/es...ngs/TH20G6.htm (ignore the top pic of the stall fence, i mean the things on the MiG and 707)
it's doesn't have to do with the span-wise flow, but it keeps the boundary layer of air from separating near and at stall speeds, the vortilon is close though.
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Old Nov 04, 2010, 12:04 AM
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I understood what you meant. The boundary layer is often less than 1 mm thick at the Reynolds numbers models fly at. You could glue little chunks of L angle to your wings but it would be a wast of effort unless scale appearance is more important than the high drag that they would cause. A 1/3rd millimeter thick piece of tape is fine for energizing the boundary layer and wouldn't take nearly as long to apply.
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Old Nov 04, 2010, 12:30 AM
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ok, in further reading i noticed the problem of scaling. would fences help also, or same thing there too? If theres something I could do that would help and haven't mentioned, please say so/ direct me, thank you for the help.
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Old Nov 04, 2010, 03:10 AM
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Fences work the same at low Re. When you get close to stall there's a strong spanwise flow that hits the fence and rolls over into a vortex on the side toward the tip. A vortilon is just a fence cut down to the absolute minimum. There's a short list of stall delaying devices here

--Norm
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Old Nov 04, 2010, 02:15 PM
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How much does your Stryker weigh?
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Old Nov 04, 2010, 06:48 PM
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it's stock, so 21 oz if i saw that correctly mine's an F-27C). coincidentally, when I googled "f-27 stryker weight" your post about making a light one came up first
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