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 Post subject: Tailwheel Spring Pad(s)
PostPosted: Sun Jun 12, 2011 18:23 
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Joined: Wed Aug 04, 2010 15:35
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Our '46 7AC has a Scott tailwheel that always shimmied on rough surfaces. At the last annual, it appeared that the mounting bolt was too long since there was play between the spring and the tailpost. A shorter one was installed, and now the shimmy is worse, particularly with someone in the back seat. I have read about the spring pads, but can't find a drawing for the assembly. Should all tailwheels have the pads? Where does the pad go? Is there one pad or two?


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PostPosted: Sun Jun 12, 2011 19:30 
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Joined: Sat Nov 28, 2009 09:07
Posts: 225
Location: Ft. Myers, FL
Sparky,

There are two pads that you need. On Page 28 of the Aeronca Champ Service Manual, you will find a diagram of the leaf springs. The two pads are noted as I-557-1 and I-557-2. The sizes are different. If John Probst reads this, he has more specifics. If I can find it, I'll try to give you the blueprint number. One pad goes on top and one on the bottom, between the spring leaves, as shown in the diagram.

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Cell (815) 222-9812
1946 7AC-2407 N83729
1979 182Q N42RH


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PostPosted: Mon Jun 13, 2011 02:41 
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Joined: Fri Jun 20, 2008 17:44
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Location: Elizabeth, West Virginia
There is an article posted on Aeronca.com related to the tailwheel pads. Unfortunately the site is currently temporarily down for updating to the Aeronca museum. Contact me offline and I'll email you the info you need.

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John Propst
313 Hickory Grove Ln
Elizabeth, WV 26143
cell 304 588 3690
j.e.propst@ieee.org
N3129E 2WV3


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PostPosted: Mon Jun 13, 2011 13:22 
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Location: San Martin, California
Sparky,
Take a look at the tail wheel pivot. It should be near vertical to the eye when assembled with the correct components. It not, you may need to replace or arch the spring. Plus it will steer easier.
Paul

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Mailing Adress : Paul Agaliotis 2060 E. San Martin, San Martin,Calif. 95046


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PostPosted: Tue Jun 14, 2011 07:29 
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Joined: Thu Oct 16, 2008 17:28
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Location: Florence, Oregom
For a long time mine had an aluminium block, and no rubber pads. Now the pads.
Anything can wear and loosen up, but if the spring sags, particularly under load, you will get shimmy.
Re arch, or replace.

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Tail winds are a "Good Thing"


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PostPosted: Tue Jun 14, 2011 14:40 
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Joined: Wed Mar 19, 2008 21:14
Posts: 173
Location: Colorado Springs
Univair carries the pads. As is always the case with their website, you must be a genious or clairvoyant to find something.
I searched under tailwheel pads, tailwheel springs, Scott, aeronca etc. and found nothing. I finally tried "pad" and sure enough, they popped up. 2 different part numbers. I guess upper and lower? $7 apiece.

Brian Walker
NC1197E '46 7AC/DC


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PostPosted: Tue Jun 21, 2011 04:29 
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Joined: Wed Aug 04, 2010 15:35
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I got the pads from John Propst and took them to the plane, only to discover that we have a "non-standard" mount, and only 1 rubber pad. Univair has the proper fitting, U1-555, but they show 2 different U-bolts. Part# U1-10589 and U1-10325. Does anyone know which one I am supposed to use?


Attachments:
N2179E Tailspring.jpg
N2179E Tailspring.jpg [ 134.59 KiB | Viewed 1712 times ]
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PostPosted: Tue Jun 21, 2011 08:28 
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Joined: Thu Oct 16, 2008 17:28
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Location: Florence, Oregom
Home Made
I don't much like the looks of the lower bracket. Following the factory drawings would not be difficult, and use the pads.

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Tail winds are a "Good Thing"


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PostPosted: Wed Jun 22, 2011 09:02 
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Location: Kirkland, WA
Don't make it too complicated....Radiator hose material cut to shape works too.

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Harvey Field, WA
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PostPosted: Wed Jun 22, 2011 10:04 
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Location: Western Wisconsin
I cut mine out of an old mudflap.
Mike


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PostPosted: Wed Jun 22, 2011 13:27 
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Joined: Wed Dec 08, 2004 16:49
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Location: San Martin, California
Sparky,
The stock fitting has a U shaped channel and connects with a couple of bolts. In the later planes they used a single U bolts. Some of the U bolts fit the Champ spring width and some the later Citabria spring width. I don't have a parts manual handy but Univair adds a U to the factory part number to indicate PMA manufacture as opposed to NOS.
It may just be the photo, but the second leaf looks broken. The three springs should follow the same contour with the second spring attaching at the tailwheel. The main spring will attach to the fuselage and the tailwheel, with the little top spring kind of floating there supported by the fitting.
Your fitting looks like a Taylorcraft set-up.
Paul

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PostPosted: Sat Jun 25, 2011 04:28 
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Joined: Fri Jun 20, 2008 17:44
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Location: Elizabeth, West Virginia
Drawing 4-620 shows the assembly of the various components for attaching the tailwheel assembly to the aircraft. The "U" shaped bracket, called the fitting assembly, is shown on drawing 1-555. This part is available from Wag and others. As shown on drawing 4-620 it is attached with two AN4-16A bolts and two AN365-428 nuts. Pad 1-557-1 goes above the leaf spring assembly and pad 1-557-2 goes below the leaf spring assembly.

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John Propst
313 Hickory Grove Ln
Elizabeth, WV 26143
cell 304 588 3690
j.e.propst@ieee.org
N3129E 2WV3


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PostPosted: Tue Jun 28, 2011 20:20 
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Joined: Thu Jan 21, 2010 13:24
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Location: Santa Ynez, CA
Here are a set of photos showing before and after installing the official Aeronca rubber tail spring pads. I hope this helps.
Regards,
Sam


Attachments:
with pads.jpg
with pads.jpg [ 103.46 KiB | Viewed 1537 times ]
No Pads.jpg
No Pads.jpg [ 109.17 KiB | Viewed 1537 times ]

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Santa Ynez, CA
N6404C L16A 7BCM-296 USAF 47-1076 C85-12F
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PostPosted: Sun Jul 17, 2011 18:07 
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Joined: Wed Aug 04, 2010 15:35
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Good photos. It looks like there is one washer between the front of the spring and the fuselage. Is that correct?


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PostPosted: Sun Jul 31, 2011 19:11 
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Joined: Wed Aug 04, 2010 15:35
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I am happy to report that we put in the new pads, and the shimmy is gone. Thanks for all the help!


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