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rexjan(at)bigpond.com
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 Posted: Sun Mar 04, 2007 7:31 pm Post subject: Droop Wing Tips |
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I would like to think that they might help in ground effect but I cannot see
what gain they are otherwise .
They would tend to hold the vortice in longer and I think for better STOL
perhaps if they were inverted they would hold the low pressure in better on
top and possibly create more lift ? Simular to a STOL fence on a 185.
What was reason for newer Kitfoxes to have the differnt tip anyone ?
Lessening Adverse yaw would be my thought.
Speed ? I am not sure as mine runs 86 to 90mph on wheels with a 582 .
Dave
Hi Dave,
I already commented re ground loop possible protection but did
not mention other aspects because I though I was getting out of my depth.
Never the less you have expressed your thoughts so I'll express mine. I
do'nt necesarilly disagree with you but as I see it the high pressure under
the wing that normally can flow out at the tips to join the low pressure on
the top gets deflected down by the droop tips actually adding to lift. If
that high pressure is allowed to flow out from under the wing at the tip and
join the low pressure on top it negates some of the lift reducing the
effective wing area. Anyway that's as I see it and if I remember correctly
it is what I was taught.
Rex.
rexjan(at)bigpond.com
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Jim Shumaker
Joined: 09 Jan 2006
Posts: 106
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| Posted: Sun Mar 04, 2007 8:47 pm Post subject: Droop Wing Tips |
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I believe droop tips help somewhat in taxiing in a crosswind. The upwind wing does not seem to want to lift as much as without.
Jim Shumaker
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Jim Shumaker |
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d(at)cfisher.com
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| Posted: Mon Mar 05, 2007 8:18 am Post subject: Droop Wing Tips |
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Rex, Thanks for that info.
Has anyone tried the Hoerner style tip and actually replaced the Droop tips
?
That is what I am looking for........ What it looks like is not important
as how it performs.
Dave
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Mon Mar 05, 2007 9:55 am Post subject: Droop Wing Tips |
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Just a guess but I could see where the Hoener tips will climb and cruise a
bit faster. I would also expect the lift off would be a tad longer. I
wouldn't expect any great changes in an 80 mph airplane.
If you went with a one piece cowl, all the struts faired the Grove spring
gear, Hoener tips small wheels with pants and a 914 you could easily
increase your speed to the point where you will want to redesign your
windshield so it wouldn't blow out.
Just don't expect it to do the snappy take offs it does now and you will
make your mud jumping nothing more than a memory. Flying floats may a bit
different too. But if you got as much water as I do the Hoeners might save
you a couple of pennies on longish a flight.
Have you checked out the weight of the Hoeners vs. the droops??
Noel
[quote] --
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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