The plane on 733 is to put VG's on it, but that's a ways down the road, so we haven't debated the subject heavily.
I find the black science comment somewhat funny. VG's are one of the easiest things to document in a low wing aircraft. A roll of tape, a ball of yarn, and a video camera, go flying and take before and after videos. It's fairly plain to see. Youtube has a number of video's of people trying out low wing aircraft with VG's.
I put VG's on a '66 172, made a huge difference on landing. Crosswind or heavy winds, the controls were simply alot more effective to slower speeds. The VG's made it a much safer plane in nearly any instance. Let's just say it did add a touch of drag. In a 172 or Rebel? Who cares.
I never saw any difference in top end speed due to the VG's in the 172, O-300 or O-360. But low speed, it was dramatic.
If you're in a Lancair or RV, there's probably more to debate. In anything less than 150 kts, the debate is probably meaningless.
Rob Luce
R733
________________________________
From: Walter Klatt <
Walter.Klatt@shaw.ca>
To:
rebel-builders@dcsol.com
Sent: Fri, October 9, 2009 8:49:29 PM
Subject: RE: [rebel-builders] Measuring chord for VG's
Yeah, when you talk to aeronautical engineers and designers, they still take
the view that VGs are only necessary to correct a flaw. The Beavers, and
Otters even more so, have very long wings compared to ours, so maybe VGs
don't do much for them.
To me they are still a black science. I used to believe that it was all just
about angle of attack, but since flying with them on floats for a few years
now, there is no doubt in my mind they create extra lift even without a high
angle of attack. They also really help lift off (and land) a very heavily
loaded plane, too. And I see how well the Elite (150 pounds more than a
Rebel) with them performs off the water.
I was out at the lake today, and came back to a 10 kt gusting 20, 90 degree
crosswind at Langley. That is not common here actually, and I don't get a
lot of crosswind practice. But despite having to really work the ailerons in
the gusts to keep the wing down and almost full rudder, it was almost easy
to softly touch down one wheel first, and even gently lower the front ones
as I normally do in low wind conditions. I truly think it is the VGs that
help in these situations, and keep those flaperons responsive even at slower
speeds. I found out later that a Cessna pranged up on landing a little
earlier.
Anyway, as everyone here well knows by now, I am definitely a VG fan.
Walter
-----Original Message-----
From:
mike.davis@dcsol.com [mailto:
mike.davis@dcsol.com] On Behalf Of Ken
Sent: October 9, 2009 6:18 PM
To:
rebel-builders@dcsol.com
Subject: Re: [rebel-builders] Measuring chord for VG's
No I didn't put them on the wings Walter.
Angus bought a set to try with his STOL cuff but he had not tried them
yet as of a few weeks ago. I don't see how the ability to fly at an even
higher angle of attack can possibly help but hey it's all fun and
learning ;)
Odd that I've never noticed VG's on any of the dehavilland Beaver or
Otter aircraft?? I would have thought they might be a natural for VG's
with the 4415 wing and a lot more flap than we have...
Ken
Walter Klatt wrote:
Ken, did you put the VGs on the wings, too? I am just curious if anyone
has
put them on wings with the STOL kit, and what the effect was.
Walter
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