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Stiff Aileron

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barrynorman(at)comcast.ne
Guest

Posted: Thu Jan 03, 2013 5:43 pm Post subject: Stiff Aileron

I noticed after an extended flight up to Baltimore in low 20 degree F temps that my ailerons took significantly more effort to move than normal. After I landed, I checked out the plane and found nothing wrong. It appeared to have improved some on the ground with slightly higher temps in the low 30s. After thinking about it today I looked up the expansion/contraction rate of wood (rear spar) and aluminum (aileron) and did a calculation on the length of the aileron and found the difference was .020.  Bottom line is I was wondering if that's enough to create bind in the hinges due to the difference in installed temp and the cold air I was flying in. When I think back to when I was testing the plane 7 years ago in cold air, they were stiff then also. I'm considering removing the ailerons and filing a little more clearance in the tabs on the hinges to see if that helps the situation.



Any thoughts?



Barry



 [quote][b]

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blanducci

Joined: 18 Jan 2011
Posts: 3
Location: Madison, WI

Posted: Fri Jan 04, 2013 5:21 am Post subject: Stiff Aileron

I as well have noticed this. The good thing is that it didn't seem to get any worse at extreme cold temps. I've registered -20F on several flights, and on several occasions, not much warmer than that while doing pre-flight control checks. Stiff, but still smooth and responsive - no sticking. 



The rudder, on the other hand, gets very 'sticky' when warm. Especially on hot days during the flight or after landing. I think this is due to the nylon bushings in the steel tubes of the rudder pedal assembly. The rudder moves smoothly on it's hinges, but the pedal assembly sticks. In the series III the water coolant lines (four 1" hoses) run under the pedal assembly platform - providing some nice radiant heat.

Bill L

On Jan 3, 2013, at 7:42 PM, barrynorman(at)comcast.net (barrynorman(at)comcast.net) wrote:

 	  Quote: 	
		  I noticed after an extended flight up to Baltimore in low 20 degree F temps that my ailerons took significantly more effort to move than normal. After I landed, I checked out the plane and found nothing wrong. It appeared to have improved some on the ground with slightly higher temps in the low 30s. After thinking about it today I looked up the expansion/contraction rate of wood (rear spar) and aluminum (aileron) and did a calculation on the length of the aileron and found the difference was .020.  Bottom line is I was wondering if that's enough to create bind in the hinges due to the difference in installed temp and the cold air I was flying in. When I think back to when I was testing the plane 7 years ago in cold air, they were stiff then also. I'm considering removing the ailerons and filing a little more clearance in the tabs on the hinges to see if that helps the situation.



Any thoughts?



Barry



 	  Quote: 	
		  



href="http://www.matronics.com/Navigator?Pulsar-List">http://www.matronics.com/Navigator?Pulsar-List

href="http://forums.matronics.com">http://forums.matronics.com

href="http://www.matronics.com/contribution">http://www.matronics.com/contribution



	


	


 [quote][b]

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pv.ds(at)t-online.de
Guest

Posted: Fri Jan 04, 2013 9:30 am Post subject: Stiff Aileron

Barry,

 

 On my  Pulsar III, I also have stiff ailerons at below freezing temps. I just used an oil on the hinges, the aileron control tube slider bushing, and all ball joints thats good for low temps to help the situation.

 

 Regards

 

 Dan

 

 

 

 Am 04.01.2013 2:42 Uhr schrieb "barrynorman(at)comcast.net" unter <barrynorman(at)comcast.net>:

 

  	  Quote: 	
		  I noticed after an extended flight up to Baltimore in low 20 degree F temps that my ailerons took significantly more effort to move than normal. After I landed, I checked out the plane and found nothing wrong. It appeared to have improved some on the ground with slightly higher temps in the low 30s. After thinking about it today I looked up the expansion/contraction rate of wood (rear spar) and aluminum (aileron) and did a calculation on the length of the aileron and found the difference was .020.  Bottom line is I was wondering if that's enough to create bind in the hinges due to the difference in installed temp and the cold air I was flying in. When I think back to when I was testing the plane 7 years ago in cold air, they were stiff then also. I'm considering removing the ailerons and filing a little more clearance in the tabs on the hinges to see if that helps the situation.

 

 Any thoughts?

 

 Barry

 

 

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       [quote][b]

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lwheat2083(at)gmail.com
Guest

Posted: Fri Jan 04, 2013 9:56 am Post subject: Stiff Aileron

I experienced the same thing BUT my problem was the center stick. I disconnected the ailerons and the stiffness remained leaving the joystick as the culprit. I burnished and polished several times with crocus cloth and polishing wheel. After 5-6 tries I finally got it to the right diameter for a good fit. The perplexing thing is that it was normal for 50 hrs. All of a sudden in 45 degree weather it stiffened up. Some food for thought. Don't know if it is the aluminum (which should have contracted if anything) or the micarta bearings. Anyway seems to be ok now. Some food for thought, Cheers, Larry N852LW

 

On Thu, Jan 3, 2013 at 5:42 PM,  <barrynorman(at)comcast.net (barrynorman(at)comcast.net)> wrote:

 	  Quote: 	
		   I noticed after an extended flight up to Baltimore in low 20 degree F temps that my ailerons took significantly more effort to move than normal. After I landed, I checked out the plane and found nothing wrong. It appeared to have improved some on the ground with slightly higher temps in the low 30s. After thinking about it today I looked up the expansion/contraction rate of wood (rear spar) and aluminum (aileron) and did a calculation on the length of the aileron and found the difference was .020.  Bottom line is I was wondering if that's enough to create bind in the hinges due to the difference in installed temp and the cold air I was flying in. When I think back to when I was testing the plane 7 years ago in cold air, they were stiff then also. I'm considering removing the ailerons and filing a little more clearance in the tabs on the hinges to see if that helps the situation.

 

Any thoughts?



Barry



  	  Quote: 	
		  



arget="_blank">http://www.matronics.com/Navigator?Pulsar-List

tp://forums.matronics.com

_blank">http://www.matronics.com/contribution



	


	




-- 

Larry Wheat  [quote][b]

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TomisFlyingby(at)comcast.
Guest

Posted: Fri Jan 04, 2013 9:56 am Post subject: Stiff Aileron

Seems to me like a great question for Mr. Hartunian! Bob??

 Always wondered about that up here in the REAL cold land!

  

 Tom  

   From: barrynorman(at)comcast.net (barrynorman(at)comcast.net) 

 Sent: Thursday, January 03, 2013 7:42 PM

 To: pulsar-list (pulsar-list(at)matronics.com) 

 Subject: Stiff Aileron

  



  I noticed after  an extended flight up to Baltimore in low 20 degree F temps that my ailerons  took significantly more effort to move than normal. After I landed, I checked  out the plane and found nothing wrong. It appeared to have improved some on the  ground with slightly higher temps in the low 30s. After thinking about it today  I looked up the expansion/contraction rate of wood (rear spar) and aluminum  (aileron) and did a calculation on the length of the aileron and found the  difference was .020.  Bottom line is I was wondering if that's enough to  create bind in the hinges due to the difference in installed temp and the cold  air I was flying in. When I think back to when I was testing the plane 7 years  ago in cold air, they were stiff then also. I'm considering removing the  ailerons and filing a little more clearance in the tabs on the hinges to see if  that helps the situation.



Any thoughts?



Barry



[quote]



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