Results 1 to 22 of 22

Thread: Tail wheel chain length

  1. #1

    Join Date
    Feb 2010
    Location
    Idaho
    Posts
    43
    Post Thanks / Like

    Tail wheel chain length

    Is there any way to adjust the length of the tail wheel chain? If I use 5 links on each side the springs are quite loose. If I remove one from each side there is no slack. Any way to add 1/2 a link (or the equivalent length)?
    Thanks Nodak33 thanked for this post

  2. #2
    Cub Special Ed's Avatar
    Join Date
    Oct 2016
    Location
    MT/SD
    Posts
    424
    Post Thanks / Like
    Steve Pierce has a good youtube video on the subject. Adjusted mine the way he described.
    "There are 3 kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves." Will Rogers

  3. #3
    www.SkupTech.com mike mcs repair's Avatar
    Join Date
    Aug 2004
    Location
    chugiak AK
    Posts
    10,193
    Post Thanks / Like
    you want the slight slack, not the tight... close enough

  4. #4

    Join Date
    Apr 2018
    Location
    Knoxville, Tn.
    Posts
    153
    Post Thanks / Like
    Quote Originally Posted by Cub Special Ed View Post
    Steve Pierce has a good youtube video on the subject. Adjusted mine the way he described.
    Couldn't find it. Cool video of an armadillo eating a worm though.

  5. #5
    Eddie Foy's Avatar
    Join Date
    Dec 2014
    Posts
    3,344
    Post Thanks / Like
    https://m.youtube.com/watch?v=QtokU8mIDQk


    Quote Originally Posted by Tennessee View Post
    Couldn't find it. Cool video of an armadillo eating a worm though.
    "Put out my hand and touched the face of God!"
    Thanks Tennessee, JDWilliams thanked for this post
    Likes sjohnson, JDWilliams liked this post

  6. #6
    Eddie Foy's Avatar
    Join Date
    Dec 2014
    Posts
    3,344
    Post Thanks / Like
    https://m.youtube.com/watch?v=X1uAd0KSnCc


    Quote Originally Posted by Tennessee View Post
    Couldn't find it. Cool video of an armadillo eating a worm though.
    "Put out my hand and touched the face of God!"

  7. #7
    Eddie Foy's Avatar
    Join Date
    Dec 2014
    Posts
    3,344
    Post Thanks / Like
    https://m.youtube.com/watch?v=8MGri0D50hg

    Quote Originally Posted by Tennessee View Post
    Couldn't find it. Cool video of an armadillo eating a worm though.
    "Put out my hand and touched the face of God!"

  8. #8
    cubdriver2's Avatar
    Join Date
    Apr 2003
    Location
    upstate NY
    Posts
    9,739
    Post Thanks / Like
    Quote Originally Posted by mike mcs repair View Post
    you want the slight slack, not the tight... close enough
    It's like your mistress, some like it tight, some like it sloppy

    Glenn
    "Optimism is going after Moby Dick in a rowboat and taking the tartar sauce with you!"
    Likes RaisedByWolves, KevinJ liked this post

  9. #9
    Cub Special Ed's Avatar
    Join Date
    Oct 2016
    Location
    MT/SD
    Posts
    424
    Post Thanks / Like
    1st video Eddie Foy post was the one i was talking about.
    "There are 3 kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves." Will Rogers

  10. #10

    Join Date
    Jan 2007
    Posts
    1,598
    Post Thanks / Like
    Do you have the AN eye bolts? Sometimes adding or removing them will make that small change you are looking for.
    DENNY

  11. #11
    hotrod180's Avatar
    Join Date
    May 2008
    Location
    Port Townsend, WA
    Posts
    2,517
    Post Thanks / Like
    There are different pitches of sash chain available-- check your local Ace Airmotive store.
    You might be able to find a size that allows for your required mength.
    Or you can set it up too tight, with the 4 links of the chain you have now as described,
    then pinch some or all of the links flatter--that'll loosen it up some.
    Cessna Skywagon-- accept no substitute!
    Likes DENNY liked this post

  12. #12

    Join Date
    Feb 2010
    Location
    Idaho
    Posts
    43
    Post Thanks / Like
    Thanks for the video link (very clear).
    However, when I tried to adjust the chain length as shown I got very different results. My problem is that I've got the short pawl. This is the way the tail wheel came from the SQ2 kit. My wheel turns quite a lot farther before it engages the pawl.
    Should I be using the long pawl?

  13. #13
    Steve Pierce's Avatar
    Join Date
    Mar 2002
    Location
    Graham, TX
    Posts
    18,421
    Post Thanks / Like
    Quote Originally Posted by d_kandle View Post
    Thanks for the video link (very clear).
    However, when I tried to adjust the chain length as shown I got very different results. My problem is that I've got the short pawl. This is the way the tail wheel came from the SQ2 kit. My wheel turns quite a lot farther before it engages the pawl.
    Should I be using the long pawl?
    I prefer the long pawl on an off airport use airplane. It allows me to unlock in less space and maneuver around things in tighter areas. Have seen no adverse effects in landing or take off. I know of two people who prefer the short pawl which unlocks in 45 degrees of rotation.
    This is a short pawl.
    Click image for larger version. 

Name:	2014-04-26-08-20-16.png 
Views:	428 
Size:	583.6 KB 
ID:	41562
    Steve Pierce

    Everybody is ignorant, only on different subjects.
    Will Rogers
    Thanks d_kandle thanked for this post

  14. #14

    Join Date
    Jan 2007
    Posts
    1,598
    Post Thanks / Like
    I prefer no slack in the tailwheel chains. The chain adjustment shown in the video is too loose for me. It has a delay between rudder movement and tire movement, I have tried it that way and the steering response was poor.

    So the question is what about steering don't you like?

    If it is poor/delayed response you need to eliminate slack. Stiff turning/ won't pivot when pushing tail sideways by hand, make sure it is lubed properly (NOT OVERLUBED) and 3 springs not 5. Want it to unlock sooner, go to long pawl. Cuation!! Tight chains can cause issues also so I would error on the side of slight slack as mike said.

    DENNY
    Thanks JDWilliams thanked for this post
    Likes JDWilliams liked this post

  15. #15

    Join Date
    Feb 2010
    Location
    Idaho
    Posts
    43
    Post Thanks / Like
    Quote Originally Posted by DENNY View Post

    So the question is what about steering don't you like?
    DENNY
    I didn't like the part where the steering arm was getting bent or not holding. I didn't fully understand the internals. I had compression springs and a short pawl. The springs were getting completely compressed before the pawl released the steering arm. With the lighter weight steering arm the result was bent arms. It was suggested that I upgrade to the heaver steering arm. Then the weak point was the internals of the steering arm. It got so that the arm would not hold at all for a turn to the left (it would take very little rudder pressure to break it free) but the pawl was never doing the release.
    It appears that the more tension from the spring which is present when the pawl releases the steering arm the harder it is on the internals. Short pawl and compression springs seems to be a non-working combination (unless the chains are very loose). I've ordered a long pawl. I would like to have positive steering, so I don't want to have a lot of slack in the chain. Using a short pawl, it would appear that unless I want to have a very hard pull from the spring when the short pawl engages the release spring, the chains need lots of slack (to avoid stretchering them too much prior to the pawl reaching the release spring).

  16. #16
    www.SkupTech.com mike mcs repair's Avatar
    Join Date
    Aug 2004
    Location
    chugiak AK
    Posts
    10,193
    Post Thanks / Like
    Quote Originally Posted by d_kandle View Post
    I didn't like the part where the steering arm was getting bent or not holding. I didn't fully understand the internals. I had compression springs and a short pawl. The springs were getting completely compressed before the pawl released the steering arm. With the lighter weight steering arm the result was bent arms. It was suggested that I upgrade to the heaver steering arm. Then the weak point was the internals of the steering arm. It got so that the arm would not hold at all for a turn to the left (it would take very little rudder pressure to break it free) but the pawl was never doing the release.
    It appears that the more tension from the spring which is present when the pawl releases the steering arm the harder it is on the internals. Short pawl and compression springs seems to be a non-working combination (unless the chains are very loose). I've ordered a long pawl. I would like to have positive steering, so I don't want to have a lot of slack in the chain. Using a short pawl, it would appear that unless I want to have a very hard pull from the spring when the short pawl engages the release spring, the chains need lots of slack (to avoid stretchering them too much prior to the pawl reaching the release spring).
    compression springs is the answer to you problem... or I mean that's your problem!

  17. #17
    hotrod180's Avatar
    Join Date
    May 2008
    Location
    Port Townsend, WA
    Posts
    2,517
    Post Thanks / Like
    I'd never heard of this before, and have looked at several different exploded parts drawings pof the Scott 3200 & 3400 t/w's from the spruce & univair catalogs as well as from ABW. I just checked the Airframes Alaska / ABW website and found a drawing where they ID both a short pawl & a long pawl. When did they start offering two different length pawls, and which one is the original part? (I posted this on the t/w castering thread also)
    Cessna Skywagon-- accept no substitute!
    Thanks JDWilliams thanked for this post

  18. #18

    Join Date
    Jan 2007
    Posts
    1,598
    Post Thanks / Like
    I would do as Mike suggested and get rid of the compression springs. Rebuild/lube according to Steves video and throw in the long pawl. That should do the job. Grease plays a important role especially in the cold. I use AeroSchell 22 now, the motion of the tailwheel is not as stiff in the cold compared to some other red grease.

    I don't know when the long pawl came out, but when I had my Cessna problem last year that was the fix. On a side note never grind the pawl to make it work smoother that is what caused my problem. Polishing the end on a buffing wheel is all that is recommended.
    DENNY

  19. #19

    Join Date
    Feb 2010
    Location
    Idaho
    Posts
    43
    Post Thanks / Like
    I figured out that the compression springs were reaching their limit before the steering arm released. I replaced them with standard cub extension springs soon after I got the heaver steering arm.
    Likes DENNY liked this post

  20. #20
    flyrite's Avatar
    Join Date
    Mar 2013
    Location
    Lyons,GA
    Posts
    377
    Post Thanks / Like
    This is a simalar disscussion to what the guys flying the squirlly little HOT LANDING acro planes have continually. Lot's of those guys start out with the springs loose till they get over thier "Happy Feet" syndrome. Then they move to get rid of the commpression springs and learn that the mount is much more controllable as well as more docile when they do !
    Interesting bit of knowledge on the long or short paw, Always learning some knew!

  21. #21

    Join Date
    Jun 2018
    Location
    England
    Posts
    322
    Post Thanks / Like
    Quote Originally Posted by flyrite View Post
    This is a simalar disscussion to what the guys flying the squirlly little HOT LANDING acro planes have continually. Lot's of those guys start out with the springs loose till they get over thier "Happy Feet" syndrome. Then they move to get rid of the commpression springs and learn that the mount is much more controllable as well as more docile when they do !
    Interesting bit of knowledge on the long or short paw, Always learning some knew!
    What is the alternative to compression springs?


    Sent from my iPhone using SuperCub.Org mobile app

  22. #22
    PerryB's Avatar
    Join Date
    Aug 2007
    Location
    Northern Calif.
    Posts
    1,755
    Post Thanks / Like
    Tension springs.
    After Monday and Tuesday, even the calendar says WTF !
    Likes Gordon Misch liked this post

Similar Threads

  1. tail wheel chain and springs.
    By high country air in forum Everything Else (formerly:My Other Plane Is A....)
    Replies: 7
    Last Post: 07-14-2009, 07:49 AM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •