Today's Message Index:
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1. 04:22 AM - Re: Looking for a used ICOM radio (Pfatchantz)
2. 05:15 AM - Re: heavy left wing, how trim tabs work. (Watkinsdw)
3. 05:53 AM - Re: Re: heavy left wing, how trim tabs work. (Rick Neilsen)
4. 06:04 AM - Re: heavy left wing, how trim tabs work. (Richard Pike)
5. 11:37 AM - Heavy wing (B Young)
Message 1
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| Subject: | Re: Looking for a used ICOM radio |
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Message 2
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| Subject: | Re: heavy left wing, how trim tabs work. |
When I had my Mk III Classic, I had big washers in the rear attachment point of
the left wing. There were two on one side of the wing spar, and one on the other
side, within the u-shape receiver. By rearranging the double stack to one
side or the other, I could adjust the roll trim for flying solo, or with a passenger.
Dont know if this will work for you, but it did for me..
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=499305#499305
Message 3
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| Subject: | Re: heavy left wing, how trim tabs work. |
The problem is your Kolbs have a trim issue. The factory makes an optional
adjustable universal joint (this is the wing rear attach fitting) that I
think Dave is talking about and this is the best fix for this problem.
Rick Neilsen
Redrive VW Powered MKIIIC
On Sun, Nov 8, 2020 at 8:18 AM Watkinsdw <david.watkins0@gmail.com> wrote:
>
> When I had my Mk III Classic, I had big washers in the rear attachment
> point of the left wing. There were two on one side of the wing spar, and
> one on the other side, within the u-shape receiver. By rearranging the
> double stack to one side or the other, I could adjust the roll trim for
> flying solo, or with a passenger. Don=99t know if this will work fo
r you, but
> it did for me..
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=499305#499305
>
>
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>
>
Message 4
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| Subject: | Re: heavy left wing, how trim tabs work. |
What Rick said.
Something to think about, if you try to raise a wing by lowering it's aileron,
you will increase the drag of that wing. Which now adds another factor to the
mix by having that side of the airplane want to create yaw.
IMO, if the left wing feels heavy, you are better off adding a downward deflected
trim tab to the right wing aileron, raising the right wing aileron to push
the right wing down a bit, and then adjust your aileron differential so that when
the right aileron is up a hair, the left aileron is in line with the bottom
of the left wing so as not to add extra drag to that side.
Anyway, it worked for me, and I made mine adjustable because things change a bit
depending on if you are carrying a passenger.
http://oh2fly.net/oldpoops/pg6.htm
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kolb Firefly Part 103 legal
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=499308#499308
Message 5
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I first flew my kolb mkiii in 2000. My right wing was heavy so i started
making adjustments.
First thing, i had to hold 2 to 3 pounds of stick pressure to keep the
wings level, but we noticed that the ailerons were exactly even with the
flaps.
First I modified my rear attach fittings. I welded a small bead in the 1/2
inch hole, then filed the opposite side.. this effectively move the whole
maybe 1/16 of an inch. on the heavy wing I lowered the trailing edge and on
the light wing I raised a trailing edge. I did this on both sides and I
lowered the rear attached point of the heavy wing and raise the rear
attach on the right. This change the incidence from one wing to the other
and it would fly hands off. but I noticed that the ailerons and flaps were
out of alignment one being near an inch high and the other aileron being a
inch low compared to the flaps. This is equivalent to kolbs adjustable
fitting but not adjustable
I then ordered another set of unmodified rear attach fittings from colb and
remounted back of the wings to stock. Then I installed a trim tab.. my
gray matter told me that when a wing stalls you disrupt the air on the top
side of the Wing,, so I chose to put the trim tab on the bottom side of
the aileron and bend it down that way flying at any speed the trim tab
would stay in effect..
My trim tab is 1 aileron Bay wide and it extends beyond the trailing edge
inch and a half to 2 inches and it's bent down approximately 1/2 of an
inch.. there's another 1 1/2 to 2-inch where I riveted it to the bottom
of the aileron ribs and trailing edge.
in my case where the right-wing was heavy I put a trim tab on the left
aileron on the bottom side pointing down. the trim tab causes the left
aileron to raise and the right aileron to lower and it corrected the role
and I was back to hands-off flying and this time the ailerons and the flaps
were still lined up perfectly.
If you have questions please feel free to ask.
Boyd Young
Kolb mkiii utah
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