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Linkage from Differential valve to rudder pedals

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lik_2_fly(at)hotmail.com
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Posted: Wed Feb 06, 2008 5:04 pm Post subject: Linkage from Differential valve to rudder pedals

Hi All,

  

 Ive noticed im not getting full rudder deflection on a Yak 52 and it appears to be hitting the end of travel on the differential valve before hitting the rudder stops.

  

 Looking at the drawings it appears there is a spring cartridge in the link between the rudder pedals and the differential valve. Im guessing its to allow's for full travel of the rudder. Has anyone had any trouble with this or has more information on its operation.

  

 regards

 Chris

 Adelaide, Australia

  

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dsavarese(at)elmore.rr.co
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Posted: Wed Feb 06, 2008 6:56 pm Post subject: Linkage from Differential valve to rudder pedals

Chris,

 I have seen a similar situation on one other Yak  52.   Hopefully what I'm about to describe will be of some  benefit.  Go to the arm on the front side of the brake differential valve  (forward of the main spar).  It has the two adjuster bolts going thru  it.  Put you thumb and index finger on the end of the arm where it connects  to the bar going aft through the main spar.  Now try moving the arm  vertically from this junction.  There should be very minimal movement  when you attempt to move the arm up and down.  If there is vertical  movement, there is wear on the arm where it mounts to the differential  valve.  Here's the point to all this.

  

 If the arm can move up and down at the end, it also  moves the bar and spring mechanism up and down as it passes through the  elliptical hole in the main spar.  Because the arm is able to move up and  down it can cause the nut at the adjustment section of the spring mechanism to  hit the bottom of the elliptical hole, causing the rudder travel to come to a  stop, or effectively jam.

  

 I removed the arm from the brake differential valve  (pretty easy to do by removing the pin) and made a shim and drilled a hole in it  for the pin from a piece of stainless steel shim stock, maybe about .010 thick,  and placed it between the bottom of the bracket holding the arm and the arm  itself, thus eliminating the slop.  Once I did this, the bar/spring  mechanism was able to move freely through the elliptical hole in the  spar.

  

 Hope this helps.

 Dennis

  

  

   

 [quote]   ---

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lik_2_fly(at)hotmail.com
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Posted: Thu Feb 07, 2008 12:15 am Post subject: Linkage from Differential valve to rudder pedals

Thanks all, found the problem. 

  

 Thanks to Dennis i was quickly able to determine that the push rod was working correctly.

  

 The front rudder pedals where installed back to front during original overhaul, when the rudder pedals where adjusted full forward the foward linkage didnt have enough room to clear the rudder pedal mounting tude.

  

 cheers

 Chris

  	  Quote: 	
		    From: lik_2_fly(at)hotmail.com

To: yak-list(at)matronics.com

Subject: Yak-List: Linkage from Differential valve to rudder pedals

Date: Thu, 7 Feb 2008 11:25:18 +1030



   .ExternalClass .EC_hmmessage P {padding:0px;} .ExternalClass EC_body.hmmessage {font-size:10pt;font-family:Tahoma;}  Hi All,

 

Ive noticed im not getting full rudder deflection on a Yak 52 and it appears to be hitting the end of travel on the differential valve before hitting the rudder stops.

 

Looking at the drawings it appears there is a spring cartridge in the link between the rudder pedals and the differential valve. Im guessing its to allow's for full travel of the rudder. Has anyone had any trouble with this or has more information on its operation.

 

regards

Chris

Adelaide, Australia

 



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dsavarese(at)elmore.rr.co
Guest

Posted: Thu Feb 07, 2008 4:43 am Post subject: Linkage from Differential valve to rudder pedals

Chris,

 As suggestion concerning the rudder cable mounting tubes  - for safety of flight, particularly during aerobatics; either remove them  completely or remove them and cut the end closest to the rudder peddles at  a 45 - 60 degree angle.  Then reinstall.  The reason being - the  heal of the shoe or boot can jam against the front edge of the tube when full  rudder deflection is applied.  This can be dangerous during aerobatic  maneuvers where full rudder deflection is needed.

 Dennis

  

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f4ffm2(at)adelphia.net
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Posted: Thu Feb 07, 2008 8:12 am Post subject: Linkage from Differential valve to rudder pedals

It is interesting that there are still airplanes out there without this modification.  It was a mandatory bulletin in the DOSAAF (like our Airworthiness Directive) to have the tubes modified.  People had died because of them.  To my mind, they MUST be modified before further flight.

Roger______________________________________________________________________________

On Feb 7, 2008, at 4:37 AM, A. Dennis Savarese wrote:

[quote]Chris,

As suggestion concerning the rudder cable mounting tubes - for safety of flight, particularly during aerobatics; either remove them completely or remove them and cut the end closest to the rudder peddles at a 45 - 60 degree angle.  Then reinstall.  The reason being - the heal of the shoe or boot can jam against the front edge of the tube when full rudder deflection is applied.  This can be dangerous during aerobatic maneuvers where full rudder deflection is needed.

Dennis

 

[quote]---

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dsavarese(at)elmore.rr.co
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Posted: Thu Feb 07, 2008 8:39 am Post subject: Linkage from Differential valve to rudder pedals

You are 110% right Roger.

 Dennis

  

 [quote]   ---

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jorgen.nielsen(at)mweb.co
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Posted: Thu Feb 07, 2008 11:06 am Post subject: Linkage from Differential valve to rudder pedals

I have seen 2 very pale faces after landing when this occurred, luckily without injury…plane locked into spin.  

   

         

  

From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of A. Dennis Savarese

 Sent: 07 February 2008 02:38 PM

 To: yak-list(at)matronics.com

 Subject: Re: Linkage from Differential valve to rudder pedals  

  

     

Chris,  

    

As suggestion concerning the rudder cable mounting tubes - for safety of flight, particularly during aerobatics; either remove them completely or remove them and cut the end closest to the rudder peddles at a 45 - 60 degree angle.  Then reinstall.  The reason being - the heal of the shoe or boot can jam against the front edge of the tube when full rudder deflection is applied.  This can be dangerous during aerobatic maneuvers where full rudder deflection is needed.  

    

Dennis  

    

   

  [quote]    

---

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