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cdewey6969(at)yahoo.com
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 Posted: Sun Jul 01, 2007 4:10 pm Post subject: Vortex Generators |
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Does anyone out there know if vortex generators slow
down the cruise speed and top end of the Lightning? I
ask b/c I flew a beech sundowner before and after
installation of the VG's and the thing was darn near
impossible to stall after the VG's were installed. I
would like to put them on the Lightning but won't do
it if they are going to slow the bird down. I am doing
an experimental Lightning, not an LSA.
--- Jim Langley <pequeajim(at)gmail.com> wrote:
| Quote: | I was wondering...
Those of you who have a two tone scheme; did you
paint the fuse all white
first, and then the darker color over the white?
Or, did you mask it off
and paint the dark color over the primer?
I am talking about if you had a significant amount
of the secondary color,
like my scheme does?
Jim!
|
Moody friends. Drama queens. Your life? Nope! - their life, your story. Play Sims Stories at Yahoo! Games.
http://sims.yahoo.com/
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dashvii(at)hotmail.com
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| Posted: Sun Jul 01, 2007 4:43 pm Post subject: Vortex Generators |
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I can tell you that a lot of work was done by a professor a few years back
on this very debated subject. Think he was a Purdue Aeronautics professor.
His argument was that VG's keep the boundary layer from seperating by
creating little vortices and therefore drag. More drag means slower plane.
Anyhow, he did a very extensive flight test of a Bonanza, which should be in
the similar speed range as a well cleaned up Experimental Lightning. His
conclusions were that it did indeed slow the plane down, but it was so
negligible that the benefits outweighed the consequence. It was 1-2 knots
if memory serves. I can tell you that a Lightning with VG's will be nearly
impossible to stall as well. (oh, it'll stall, but at extremely slow speed)
In 323AL WITHOUT VG's and 30 degrees of flaps we averaged about 29 knots
stall speed! I'm thinking that on that plane with VG's you'd have around 25
knots with 30 flaps. Pretty impressive. The plane flies into and out of
tight strips as advertised though. If you don't need them, don't put them
on. Even without the VG's the stall speed is incredibly slow and the plane
breaks over very nicely. In my experience by the time the nose passes
through the horizon you've got enough speed to fly again and the plane
looses very minimal altitude. Just my thoughts, Brian W.
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