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skidookid
Joined: 10 Nov 2011
Posts: 7
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 Posted: Thu Nov 22, 2012 8:46 am Post subject: kolb left rudder in cruise |
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I have a 1997 kolb firestar II that needs 1 inch of left rudder in cruise. Has any one ever offsetting the front of vertical fin to fix this problem. Older champs have this done when installing larger motors. any words of wisdom out there. My plane has no trim tab on it. Really hate to put the big trim tab in kolb planes on the plane. looks like simple fix for bad rigging or design thanks skidookid
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roger trombley |
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zeprep251(at)aol.com
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| Posted: Thu Nov 22, 2012 8:57 am Post subject: kolb left rudder in cruise |
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You can try that,probably"P" factor giving you the issue.I have seen the off-set vertical but I'll bet you end up with the trim tab as well.
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George Alexander
Joined: 10 Jan 2006
Posts: 245
Location: SW Florida
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| Posted: Thu Nov 22, 2012 9:41 am Post subject: Re: kolb left rudder in cruise |
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| skidookid wrote: | I have a 1997 kolb firestar II that needs 1 inch of left rudder in cruise.
= S = N = I = P =
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Attached is a picture of my FSII trim tabs. These alum ones have since been replaced with Lexan ones. Rudder is slightly smaller than one shown.
My nickel's worth.
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| Description: |
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George Alexander
FS II R503
E-LSA N709FS
http://www.oh2fly.net |
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Thu Nov 22, 2012 10:35 am Post subject: kolb left rudder in cruise |
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I have a 1997 kolb firestar II that needs 1 inch of left rudder in cruise.
Has any one ever offsetting the front of vertical fin to fix this problem.
Older champs have this done when installing larger motors. any words of
wisdom out there. My plane has no trim tab on it. Really hate to put the big
trim tab in kolb planes on the plane. looks like simple fix for bad rigging
or design thanks skidookid
--------
roger trombley
MKIII had the same problem. Tried offsetting the upper vertical stabilizer,
but it was not effective. Best cure was a rudder trim tab.
john h
mkIII
Titus, Alabama
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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neilsenrm(at)gmail.com
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| Posted: Fri Nov 23, 2012 8:51 am Post subject: kolb left rudder in cruise |
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Roger
Yes I offset the vertical fin on my MKIIIC it didn't help much if any. I figure it wouldn't hurt so I left it offset when I added the trim tab. This isn't bad design it is just the way airplanes are. I have flown some bigger GA airplanes that have so much P factor that you have to set (required) extra rudder trim for takeoff and readjust for cruise. Our Kolbs need a bit more rudder on takeoff and opposite rudder on approach but with the right trim setting nothing is needed in cruise. The Kolbs good design keeps the rudder effort low enough that with or with out trim tabs the effort minimal.
Rick Neilsen
Redrive VW Powered MKIIIC
On Thu, Nov 22, 2012 at 11:46 AM, skidookid <rwtsc(at)hotmail.com (rwtsc(at)hotmail.com)> wrote:
[quote]--> Kolb-List message posted by: "skidookid" <rwtsc(at)hotmail.com (rwtsc(at)hotmail.com)>
I have a 1997 kolb firestar II that needs 1 inch of left rudder in cruise. Has any one ever offsetting the front of vertical fin to fix this problem. Older champs have this done when installing larger motors. any words of wisdom out there. My plane has no trim tab on it. Really hate to put the big trim tab in kolb planes on the plane. looks like simple fix for bad rigging or design thanks skidookid
--------
roger trombley
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