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skelly
Joined: 25 Aug 2020
Posts: 2
Location: Derbyshire
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 Posted: Wed May 05, 2021 4:30 am Post subject: Kitfox Mk2 Wing dihedral |
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Hi everyone,
I am rebuilding a mk2 kitfox and have just fitted the wings for the first time.
I have measured the dihedral angle and it works out at 2.2 degrees per wing.
I was wondering what peoples thoughts on this are ?
It looks ok.
Cheers,
Skelly.
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Wanted KFM112 engine parts. |
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Guy Buchanan
Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA
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| Posted: Wed May 05, 2021 12:26 pm Post subject: Kitfox Mk2 Wing dihedral |
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It's user preference, based on both aesthetics and controls. For
controls, the less dihedral the less positive stability in roll. My IV
had 1/2 degree per side. It would not fly straight and level hands-off,
but would roll off onto one side or the other. It also had very low
yaw-roll coupling, meaning it took a lot of yaw (rudder input) to get it
to roll. The aesthetics were nice, though.
Guy Buchanan
Ramona, CA
Kitfox IV-1200 / 912-S / Warp 3cs / 600 hrs
Glider pilot, too
On 5/5/2021 5:30 AM, skelly wrote:
| Quote: |
Hi everyone,
I am rebuilding a mk2 kitfox and have just fitted the wings for the first time.
I have measured the dihedral angle and it works out at 2.2 degrees per wing.
I was wondering what peoples thoughts on this are ?
It looks ok.
Cheers,
Skelly.
--------
Wanted KFM112 engine parts.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=501709#501709
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| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kitfox-List |
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_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too. |
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Jim Shumaker
Joined: 09 Jan 2006
Posts: 106
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| Posted: Wed May 05, 2021 4:50 pm Post subject: Kitfox Mk2 Wing dihedral |
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Hi Guy
Great to hear you're still around. I agree with you with you. My Model III had closer to 3 degrees, It flew great hands off, but the Rudder did not keep it straight.
Jim Shumaker
On Wednesday, May 5, 2021, 01:32:55 PM PDT, Guy Buchanan <gebuchanan(at)cox.net> wrote:
--> Kitfox-List message posted by: Guy Buchanan <gebuchanan(at)cox.net (gebuchanan(at)cox.net)>
It's user preference, based on both aesthetics and controls. For
controls, the less dihedral the less positive stability in roll. My IV
had 1/2 degree per side. It would not fly straight and level hands-off,
but would roll off onto one side or the other. It also had very low
yaw-roll coupling, meaning it took a lot of yaw (rudder input) to get it
to roll. The aesthetics were nice, though.
Guy Buchanan
Ramona, CA
Kitfox IV-1200 / 912-S / Warp 3cs / 600 hrs
Glider pilot, too
On 5/5/2021 5:30 AM, skelly wrote:
| Quote: | I am rebuilding a mk2 kitfox and have just fitted the wings for the first time.
|
| Quote: | I have measured the dihedral angle and it works out at 2.2 degrees per wing.
|
| Quote: | I was wondering what peoples thoughts on this are ?
|
| Quote: | Wanted KFM112 engine parts.
|
| Quote: | Read this topic online here:
|
http://forums.matronics.comnbsp; - List Contribution Web Site -
http://www.matronics.com/contribution
</==================
| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kitfox-List |
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_________________
Jim Shumaker |
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kitfox(at)mcn.org
Guest
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| Posted: Thu May 06, 2021 2:20 pm Post subject: Kitfox Mk2 Wing dihedral |
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I built my model 3 with 4 wings and controls with ½ degree dihedral. This was intentional as I wanted to reduce drag. I consider the handling good in most conditions, but there is little control harmony in the early kitfoxes. Very sensitive pitch, strong roll and lots of rudder needed all the time. They always seem to need some rudder as IMO the empennage is a bit short and the tail and rudder are a bit small. Gap seals help for landing control at slow speeds.
The handling described below I think has more to do with the wings than the angles. Model 3 wing has a lot of camber and therefore more drag.
Model 4 wing and controls are better, especially the differential flaperon controls = less adverse yaw. (I also owned a model 2).
My 3/4 flies hands off in calm air at about 95MPH. I have electric elevator trim tab and a fixed trim tab on the rudder set for this speed.
Just takes some getting used to.
Hope this helps!
Kirby Cramer About 550 Kitfox hours, About 100 in RV7A
From: owner-kitfox-list-server(at)matronics.com <owner-kitfox-list-server(at)matronics.com> On Behalf Of James Shumaker
Sent: Wednesday, May 5, 2021 5:50 PM
To: kitfox-list(at)matronics.com
Subject: Re: Kitfox Mk2 Wing dihedral
Hi Guy
Great to hear you're still around. I agree with you with you. My Model III had closer to 3 degrees, It flew great hands off, but the Rudder did not keep it straight.
Jim Shumaker
On Wednesday, May 5, 2021, 01:32:55 PM PDT, Guy Buchanan <gebuchanan(at)cox.net (gebuchanan(at)cox.net)> wrote:
--> Kitfox-List message posted by: Guy Buchanan <gebuchanan(at)cox.net (gebuchanan(at)cox.net)>
It's user preference, based on both aesthetics and controls. For
controls, the less dihedral the less positive stability in roll. My IV
had 1/2 degree per side. It would not fly straight and level hands-off,
but would roll off onto one side or the other. It also had very low
yaw-roll coupling, meaning it took a lot of yaw (rudder input) to get it
to roll. The aesthetics were nice, though.
Guy Buchanan
Ramona, CA
Kitfox IV-1200 / 912-S / Warp 3cs / 600 hrs
Glider pilot, too
On 5/5/2021 5:30 AM, skelly wrote:
| Quote: | I am rebuilding a mk2 kitfox and have just fitted the wings for the first time.
|
| Quote: | I have measured the dihedral angle and it works out at 2.2 degrees per wing.
|
| Quote: | I was wondering what peoples thoughts on this are ?
|
| Quote: | Wanted KFM112 engine parts.
|
| Quote: | Read this topic online here:
|
= --> http://www.matronics.com/Navigator?Kitfox-List
< Same great content also available via the Web Forums!
http://forums.matronics.com<br - NEW MATRONICS LIST WIKI -
nbsp; - List Contribution Web Site -
http://www.matronics.com/contribution
| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kitfox-List |
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Jack in Austin
Joined: 27 Dec 2008
Posts: 4
Location: Austin, TX USA
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| Posted: Fri May 07, 2021 5:24 am Post subject: Re: Kitfox Mk2 Wing dihedral |
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And don't forget that the angle of incidence was changed in the kitfox 2 and 3, to make it easier to see over the nose. That would probably impact flight characteristics as well. It was changed back on the 4.
Jack in Austin
| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kitfox-List |
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