---------------------------------------------------------- Kitfox-List Digest Archive --- Total Messages Posted Sun 10/04/09: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 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) ________________________________ Message 1 _____________________________________ Time: 05:21:37 PM PST US Subject: Kitfox-List: tuft/stall testing (with video) From: "carlisle" 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 _____________________________________ Time: 05:47:06 PM PST US From: Lynn Matteson Subject: Re: Kitfox-List: 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 _____________________________________ Time: 06:11:29 PM PST US Subject: Kitfox-List: Re: tuft/stall testing (with video) From: "carlisle" 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 _____________________________________ Time: 07:00:20 PM PST US From: "fox5flyer" Subject: Re: Kitfox-List: 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 _____________________________________ Time: 07:13:00 PM PST US Subject: Kitfox-List: Re: tuft/stall testing (with video) From: "carlisle" 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message kitfox-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Kitfox-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/kitfox-list Browse Digests http://www.matronics.com/digest/kitfox-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.