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1. 03:20 PM - Re: Kitfox Mk2 Wing dihedral (Kirby Cramer)
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| Subject: | Kitfox Mk2 Wing dihedral |
I built my model 3 with 4 wings and controls with =C2=BD 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@matronics.com
<owner-kitfox-list-server@matronics.com> On Behalf Of James Shumaker
Sent: Wednesday, May 5, 2021 5:50 PM
Subject: Re: Kitfox-List: 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@cox.net <mailto:gebuchanan@cox.net> > wrote:
<mailto:gebuchanan@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:
<mailto:jon.skelson@gmail.com> >
>
> 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.
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>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=501709#501709
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