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Duncan McFadyean
Joined: 18 Jan 2011
Posts: 219
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 Posted: Thu Dec 31, 2020 2:20 pm Post subject: Delaminated flow |
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Heavy port wing today; couldn't let go of the stick for any great length of time.
There was a bead of ice the size of a small half pea at about 3/4 span and 50% chord, which had dripped down from the hangar ceiling and formed a sort of frozen small stalagmite.
Didn't know the wing could be that sensitive. Something to check for next time on a freezing day.
Duncan McF.
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John Wighton
Joined: 18 May 2010
Posts: 241
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| Posted: Wed Jan 13, 2021 1:28 am Post subject: Re: Delaminated flow |
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Duncan,
Are you sure it wasn't a few kg of frozen water in that wing?
GIPOD is very sensitive to lateral balance, maybe too much Xmas turkey (or veggiechick)?
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John Wighton
Europa XS trigear G-IPOD |
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budyerly@msn.com
Joined: 05 Oct 2019
Posts: 286
Location: Florida USA
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| Posted: Wed Jan 13, 2021 5:55 am Post subject: Re: Delaminated flow |
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Duncan,
In my Vortex Generator tests and more recently the stall tests with different sized leading edge stall strips I found the plane to react quite differently with any significant change.
In tuft testing, placing tape and tufts at the 50% chord point significantly changed the deep stall and cruise trim characteristics.
Another really annoying thing is for those who built their ailerons true to design and have a slight concave surface on the aileron upper side, any water or frost still on the aft trailing edge is noticed in trim. I use a #10 wood pencil or soda straw for initial trimming simply taped as a ramp to the aileron. It is amazing what a small amount of change as a 4 inch tab can affect roll trim.
I had 12AY down for a month after a local Instructor pilot flew my plane on a short cross country and reported back that it too an annoying amount of rudder to keep it straight.
I checked everything. It appears the plane was left outside in a strong thunderstorm and the rudder was banging around which caused a slack rudder cable turnbuckle to flip the cable thimble around which shortened one cable about 1/2 inch.
Best Regards,
Bud Yerly
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Duncan McFadyean
Joined: 18 Jan 2011
Posts: 219
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| Posted: Wed Jan 13, 2021 6:27 am Post subject: Delaminated flow |
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John,
If it was water in the wing, then it will be permanent!
It's also annoying that when the cold-soaked aircraft is dragged out from the cold hangar, water then condenses and freezes on the wing surface a very fine hoar. That's happened before, but makes no difference to trim; so the boundary layer thickness is between that and the size of half a pea.
Duncan McF
do not archive.
| Quote: | On 13 January 2021 at 09:28 John Wighton <john(at)wighton.net> wrote:
Duncan,
Are you sure it wasn't a few kg of frozen water in that wing?
GIPOD is very sensitive to lateral balance, maybe too much Xmas turkey (or veggiechick)?
--------
John Wighton
Europa XS trigear G-IPOD
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500183#500183
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