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#11
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Sticking yoke
I have used a teflon spray. But it may have the same carrier characterists.
Bob Noel wrote: In article t%vKf.811830$xm3.579900@attbi_s21, "Jay Honeck" wrote: At the risk of disagreeing with Jay, I would not use a silicone spray. The carrier for the silicone oil has destroyed more plastic than I care to tell. Interesting -- I've never heard that before. Having your yoke come off in your hands could ruin your whole day. Anyone else experienced this nasty side effect of silicone sprays? yes - not with any plastic on an aircraft. But I've seen silicone destroy some plastic years ago. |
#12
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Sticking yoke
My plane is a turbo arrow IV. The sticking is definitely right in the
bearing that goes through the panel. It provides just a little bit of resistance so that when you try to make fine adjustments, its sticks and then gives a little causing me to slightly overshoot. It does not pose a real problem, but I think I would be more precise if it was smooth as silk. I am now working on my instrument rating and that is all about being smooth. wrote in message ps.com... soxinbox wrote: When doing steep turns, I noticed that there is a little resistance to pitch changes on the yoke. It seems it binds a little in the bearing through the panel. Does anyone have a suggestion for the type of lubricant I could use on this? Do they make anything for this purpose? What sort of airplane is it? Some of the older 172s had a problem with a bending/breaking panel brace that would let the panel flex enough that the control shaft bearing would start snagging and restricting elevator control. 172s also have a problem with cracking forward horizontal stab spars (caused mostly by people pushing down on the stab to turn the airplane on the ground when parking or whatever) and I have seen the spar broken clear through so that only the skin was keeping things straight. Under higher loadings (such as a steep turn) the stab will flex downward, misaligning the elevator hinges and making the elevator stiffer. A really bad sign. Might be a good idea to get it checked, if it's a 172. Look around the big lightening hole in the stab's forward spar. Sticky controls also result when pulley bearings dry out and the pulley stops (or resists) turning. Dan |
#13
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Sticking yoke
soxinbox wrote:
My plane is a turbo arrow IV. The sticking is definitely right in the bearing that goes through the panel. It provides just a little bit of resistance so that when you try to make fine adjustments, its sticks and then gives a little causing me to slightly overshoot. It does not pose a real problem, but I think I would be more precise if it was smooth as silk. I am now working on my instrument rating and that is all about being smooth. That sticking / overshooting phenomenon is endemic to the whole Cherokee model line if that bearing is not kept lubricated. I used a silicone lubricant when I owned one. It makes a huge difference in the flying qualities of the airplane. Reapply the silicone every oil change. |
#14
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Sticking yoke
I have a Cessna 150 that had silicone sprayed on the yoke shaft during it's
annual without me knowing. The next time I fly it the yoke was grabby. I wiped off most of the silicone and use a little Wd40. Was ok after that. Roger "Dave Butler" wrote in message news:1140709739.67207@sj-nntpcache-5... soxinbox wrote: My plane is a turbo arrow IV. The sticking is definitely right in the bearing that goes through the panel. It provides just a little bit of resistance so that when you try to make fine adjustments, its sticks and then gives a little causing me to slightly overshoot. It does not pose a real problem, but I think I would be more precise if it was smooth as silk. I am now working on my instrument rating and that is all about being smooth. That sticking / overshooting phenomenon is endemic to the whole Cherokee model line if that bearing is not kept lubricated. I used a silicone lubricant when I owned one. It makes a huge difference in the flying qualities of the airplane. Reapply the silicone every oil change. |
#15
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Sticking yoke
In my Seneca the bushing sort of floats and articulates as the shaft
changes angles as it is pulled aft. On the left side it doesn't and I think it is a bit of a binding problem for me. Very minor and keeping it lubed seems to fix it. soxinbox wrote: When doing steep turns, I noticed that there is a little resistance to pitch changes on the yoke. It seems it binds a little in the bearing through the panel. Does anyone have a suggestion for the type of lubricant I could use on this? Do they make anything for this purpose? |
#16
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Sticking yoke
All this talk about sticky yokes make me realize mine had started getting
stiff also. I sprayed a bit of LPS1 on the extended shaft and wiped off the greyish film from the previous annual, then put on a little more and let the carrier evaporate. After that the yoke was smooth as silk. My bearing also floats a bit in and out and allows fine adjustments even when the yoke binds a bit. -- Best Regards, Mike http://photoshow.comcast.net/mikenoel wrote in message oups.com... My plane is a turbo arrow IV. The sticking is definitely right in the bearing that goes through the panel. It provides just a little bit of resistance so that when you try to make fine adjustments, its sticks and then gives a little causing me to slightly overshoot. It does not pose a real problem, but I think I would be more precise if it was smooth as silk. I am now working on my instrument rating and that is all about being smooth. Sounds like oil has attracted dust which accumulates inside the bearing and reduces the clearance between it and the shaft. The oil dries and leaves behind the guck, which is made of dirt and varnish. Repeated applications of lube build it up further. The shaft should be removed and the hard scale cleaned out of the bearing. Some cold day that bearing might shrink enough to stop movement altogether. Dan |
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