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Tab on Rudder

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mdps_mc(at)swoca.net
Guest

Posted: Thu Jun 14, 2007 9:04 am Post subject: Tab on Rudder

I have to use alot  of right rudder on my model IV.  This became an issue after I installed the  Jabiru 2200.   This isn't a big problem but I would like to fix  it.  If I want to place a tab on my rudder which side should it go  on?  Could I use a small piece of bent lexan for the tab?  I think I  know the answer but sometimes things are counterintuitive.

  

 Mike  Chaney

 1996 Kitfox  

 Model  IV

 Jabiru  2200

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kerrjohna(at)comcast.net
Guest

Posted: Thu Jun 14, 2007 9:44 am Post subject: Tab on Rudder

I placed mine on the left side of the rudder so that it would push rather than pull the rudder to the right.  I would suggest you consider using aluminum so that you can tweek it to have the ball centered at your normal cruise speed, in the case of N195KF it is bent for equilibrium at 92 kts.  It is located at the bottom  curve of the trailing edge so that advantage can be taken of the leverage provided in riviting to the bottom portion of the tubing. (Not three rivits in a straight line).  You could similarly mount it at the top curve thereby avoiding any wind shadow created by the fuselage. I have also seen a stronger spring/shorter connection used on the right rudder pedal to address the issue.  The tab is more effective I believe at varying speeds and easier to tweek in order to get it right.

  

 John Kerr

 N195KF

 Classic IV,912UL

  

 [quote]-------------- Original message -------------- 

From: Mike Chaney <mdps_mc(at)swoca.net> 

  I have to use alot of right rudder on my model IV.  This became an issue after I installed the Jabiru 2200.   This isn't a big problem but I would like to fix it.  If I want to place a tab on my rudder which side should it go on?  Could I use a small piece of bent lexan for the tab?  I think I know the answer but sometimes things are counterintuitive.

  

 Mike Chaney

 1996 Kitfox 

 Model IV

 Jabiru 2200

[b]

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Guy Buchanan

Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA

Posted: Thu Jun 14, 2007 11:10 am Post subject: Tab on Rudder

At 10:04 AM 6/14/2007, you wrote:

  	  Quote: 	
		  If I want to place a tab on my rudder which side should it go on?  Could I use a small piece of bent lexan for the tab?  I think I know the answer but sometimes things are counterintuitive. 	


 To get right rudder use left tab. A harder question is how much. You could use Lexan, but the reason most use aluminum is that it's easy to bend to get the right amount of trim. You could first do the aluminum tab, get the size and angle right, then make one out of Lexan.



 

 

 Guy Buchanan

 San Diego, CA

 K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.     [quote][b]

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_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too.

kitfox(at)ida.net
Guest

Posted: Thu Jun 14, 2007 12:09 pm Post subject: Tab on Rudder

I did about the same thing as John Kerr. I used a fairly long piece 6" long and  3" from the trailing edge. The front of it extends out over the lower horizontal  tube a couple of inches. This takes out the twisting on the rear vertical tube.  I then glued and rivited it in place. It will fly feet off at a fairly broad  speed range. 

 Albert Smith

 5TD, NSI turbo and Cap 3 blade

   [quote][b]

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smokey_bear_40220(at)yaho
Guest

Posted: Thu Jun 14, 2007 12:28 pm Post subject: Tab on Rudder

Hi Mike,



It is possible that your new engine is mounted to pull

just a bit left.  It doesn't take much to make it pull

a lot.  You might consider shimming it at the mounts

to have it pull more right.  This means that your

cowling might not line up as exact though.  Not a big

deal with the round cowl, but the other one will show

the change.  I adjusted mine by about 3/16th inch and

it made a big difference.



Kurt S.

S-5?NSI turbo

Florida and Panama



--- Mike Chaney <mdps_mc(at)swoca.net> wrote:



 	  Quote: 	
		   I have to use alot of right rudder on my model IV. 

 This became an issue after I installed the Jabiru

 2200.......

 

 Mike Chaney

 1996 Kitfox

 Model IV

 Jabiru 2200


	




       

Take the Internet to Go: Yahoo!Go puts the Internet in your pocket: mail, news, photos & more. 

http://mobile.yahoo.com/go?refer=1GNXIC

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msm_9949(at)yahoo.com
Guest

Posted: Thu Jun 14, 2007 3:56 pm Post subject: Tab on Rudder

How about a photo John?

   

  My model 2 yaws right at cruise (70 mph). Left foot gets tired. Otherwise, she flies hands-off.



kerrjohna(at)comcast.net wrote:

  [quote]  I placed mine on the left side of the rudder so that it would push rather than pull the rudder to the right.  I would suggest you consider using aluminum so that you can tweek it to have the ball centered at your normal cruise speed, in the case of N195KF it is bent for equilibrium at 92 kts.  It is located at the bottom  curve of the trailing edge so that advantage can be taken of the leverage provided in riviting to the bottom portion of the tubing. (Not three rivits in a straight line).  You could similarly mount it at the top curve thereby avoiding any wind shadow created by the fuselage. I have also seen a stronger  spring/shorter connection used on the right rudder pedal to address the issue.  The tab is more effective I believe at varying speeds and easier to tweek in order to get it right.

   

  John Kerr

  N195KF

  Classic IV,912UL

   

  [quote]-------------- Original message -------------- 

From: Mike Chaney <mdps_mc(at)swoca.net> 

    I have to use alot of right rudder on my model IV.  This became an issue after I installed the Jabiru 2200.   This isn't a big problem but I would like to fix it.  If I want to place a tab on my rudder which side should it go on?  Could I use a small piece of bent lexan for the tab?  I think I know the answer but sometimes things are       Fussy? Opinionated? Impossible to please? Perfect.  [url=http://us.rd.yahoo.com/evt=48516/*http://surveylink.yahoo.com/gmrs/yahoo_panel_invite.asp?a=7 ]Join Yahoo!'s user panel[/url] and lay it on us.  [quote][b]

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Fri Jun 15, 2007 12:54 pm Post subject: Tab on Rudder

Attach either side of the  rudder and bend the trailing edge slightly to the left....  I know it  sounds like leaning into a left hook but that's it.  Start with a slight  bend and increase until you are comfortable with the results.  If you fly  low and slow you may need more tab input (bend) if you fly at the upper end of  the envelope than you will use less.

  

  

[img]cid:753555020(at)15062007-0A1F[/img]  

 Noel Loveys, RPP, AME intern

 Campbellton, Newfoundland, 

 Canada

 Kitfox Mod III-A, 582, B box, Ivo IFA

 Aerocet 1100s

 noelloveys(at)yahoo.ca (noelloveys(at)yahoo.ca)

 

 

 Do not archive

 



 [quote]   

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