Today's Message Index:
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1. 05:21 PM - tuft/stall testing (with video) (carlisle)
2. 05:47 PM - Re: tuft/stall testing (with video) (Lynn Matteson)
3. 06:11 PM - Re: tuft/stall testing (with video) (carlisle)
4. 07:00 PM - Re: tuft/stall testing (with video) (fox5flyer)
5. 07:13 PM - Re: tuft/stall testing (with video) (carlisle)
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| Subject: | tuft/stall testing (with video) |
HTTP://www.youtube.com/watch?v=xIODNmGuQ0Y
Had some fun with wool tufts on my Model 2 wing today. I've always been impressed
with the stall characteristics of if and wanted to see just how the stall
progressed out the wing.
First thing everyone will notice is how the fabric, especially at the root seems
loose and does a lot of oil canning. I had no idea this was happening until
I saw this vid and quickly checked the fabric tension after this flight. It's
nice and tight so I wonder if some of it is due to normal wing flexion and some
is due to the violence of the slip stream where the prop wash interacts with
the wing. Remember also that this plane was built in 1991 (by me) and at that
time, Denney shipped the lightest Stits fabric available (1.7 oz) which I
see now is reserved for ultralight use only. All Kitfox's since use the 'medium'
weight 2.4 oz fabric. At least I think they do.
Anyway, the 1.75" twist I built into the wing seems to be working and the stall
is nice and linear as it spreads from root to tip.
Next step. Vortex generators!
Chris Carlisle
Model 2, Rotax 582
Sioux Falls, SD
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=266493#266493
Message 2
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| Subject: | Re: tuft/stall testing (with video) |
1.75" ? WOW...that seems like a lot. Is this normal for the model II?
Seems like my model IV was 0.75" on each side.
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062, 786.8 hrs
Countdown to 1000 hrs~213 to go
Sensenich 62"x46" Wood prop
Electroair direct-fire ignition system
Rotec TBI-40 injection
Status: flying
On Oct 4, 2009, at 8:18 PM, carlisle wrote:
>
>
> Had some fun with wool tufts on my Model 2 wing today. I've always
> been impressed with the stall characteristics of if and wanted to
> see just how the stall progressed out the wing.
>
> First thing everyone will notice is how the fabric, especially at
> the root seems loose and does a lot of oil canning. I had no idea
> this was happening until I saw this vid and quickly checked the
> fabric tension after this flight. It's nice and tight so I wonder
> if some of it is due to normal wing flexion and some is due to the
> violence of the slip stream where the prop wash interacts with the
> wing. Remember also that this plane was built in 1991 (by me) and
> at that time, Denney shipped the lightest Stits fabric available
> (1.7 oz) which I see now is reserved for ultralight use only. All
> Kitfox's since use the 'medium' weight 2.4 oz fabric. At least I
> think they do.
>
> Anyway, the 1.75" twist I built into the wing seems to be working
> and the stall is nice and linear as it spreads from root to tip.
>
> Next step. Vortex generators!
>
> Chris Carlisle
> Model 2, Rotax 582
> Sioux Falls, SD
>
>
Message 3
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| Subject: | Re: tuft/stall testing (with video) |
Checked the manual again. 1.75 inches of twist is correct.
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=266504#266504
Message 4
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| Subject: | Re: tuft/stall testing (with video) |
Excellent video, Chris. The most informative I've seen yet on this forum.
It makes me wonder if all of our Fox wings are doing the same thing when
under load. Of course, in your video there was no wing tank as most of the
later models have. Still, it would be interesting to see the same video of
later models.
Deke Morisse
Mikado Michigan
S5/Subaru/CAP 438+ TT
"If you put the federal government in charge of the Sahara
Desert, in five years there'd be a shortage of sand."
-- Nobel prize-winning economist Milton Friedman (1912-2006)
>
> HTTP://www.youtube.com/watch?v=xIODNmGuQ0Y
>
>
> Had some fun with wool tufts on my Model 2 wing today. I've always been
> impressed with the stall characteristics of if and wanted to see just how
> the stall progressed out the wing.
>
> First thing everyone will notice is how the fabric, especially at the root
> seems loose and does a lot of oil canning. I had no idea this was
> happening until I saw this vid and quickly checked the fabric tension
> after this flight. It's nice and tight so I wonder if some of it is due
> to normal wing flexion and some is due to the violence of the slip stream
> where the prop wash interacts with the wing. Remember also that this
> plane was built in 1991 (by me) and at that time, Denney shipped the
> lightest Stits fabric available (1.7 oz) which I see now is reserved for
> ultralight use only. All Kitfox's since use the 'medium' weight 2.4 oz
> fabric. At least I think they do.
>
> Anyway, the 1.75" twist I built into the wing seems to be working and the
> stall is nice and linear as it spreads from root to tip.
>
> Next step. Vortex generators!
>
> Chris Carlisle
> Model 2, Rotax 582
> Sioux Falls, SD
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=266493#266493
>
>
>
Message 5
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| Subject: | Re: tuft/stall testing (with video) |
Thanks Deke. I've got the 13.5 gal fiberglass tank in the opposite wing. I agree
it'd be interesting to see the fabric over there. The camera is still mounted.
Maybe I'll turn it around and see what that looks like on my next flying
day.
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=266510#266510
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