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Aerobatics ServerACRO E-mail Archive Thread: [Acro] Vortex generators on Akro aircraft[International Aerobatic Club] [Articles etc] [Communications] [Contest and Patch Information] [Aviation Organizations] [Other Aerobatics Info] [Aerobatics Images] [Other Aerobatics Links] [Other Aviation Info (including weather)] [Search ACRO Website]Disclaimer: These aerobatics pages are developed by individual IAC members and do not represent official IAC policy or opinion. |
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Thread: [Acro] Vortex generators on Akro aircraft
Message: [Acro] Vortex generators on Akro aircraft
Follow-Up To: ACRO Email list (for List Members only)
From: Klein Gilhousen <kleing at qualcomm.com>
Date: Wed, 18 Apr 2001 03:16:41 UTC
Today I (finally) went to the airport to dust of the Extra and see if I could still do a hammer or a spin or whatever or even land the thing. After landing, there was a Super Decathlon sitting there getting a going over by on of the local CFI guys. Turns out the local guy who owned it had just sold it to an out of towner, who had some "improvements" made and the CFI had been engaged to go test fly it. One of the more peculiar things was the installation of vortex generators. The things look like little tabs sticking up into the airstream on the top of the wing. There were also some on the bottom of the horizontal stabilizer. I'm reasonably familiar with the concept and had installed, under STC, a set on a Cessna 421 I used to own. Basically, they lower the stall speed maybe 10% or so. In the case of the twin, they also lower Vmc a substantial amount. But I've never seen these things on an akro plane. Methinks there's probably a reason. On the plus side, they will probably lower the stall speed a significant amount, resulting in lower landing speeds, less runway, etc., etc. On the minus side, I wonder if the thing will snap any more? I wonder what happens to the spin recovery? Will it even spin? On the negative side, g that is, there aren't any on the bottom side of the wing (or the top of the stab) so inverted performance probably isn't affected much. I wonder what the STC says about akro maneuvers? Are the CFI and the new owner now test pilots? Klein Gilhousen Bozeman, MT
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