Tailwheel Spring Pad(s)

Post-War Aeronca Champ airplanes
sparky66
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Tailwheel Spring Pad(s)

Post by sparky66 » Sun Jun 12, 2011 18:23

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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RRHaldeman
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Re: Tailwheel Spring Pad(s)

Post by RRHaldeman » Sun Jun 12, 2011 19:30

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.
Dick Haldeman, RRHaldeman AT aol DOT com
Cell (815) 222-9812
1946 7AC-2407 N83729
1973 Cessna 172M N92103

jepropst
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Re: Tailwheel Spring Pad(s)

Post by jepropst » Mon Jun 13, 2011 02:41

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

Paul Agaliotis
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Re: Tailwheel Spring Pad(s)

Post by Paul Agaliotis » Mon Jun 13, 2011 13:22

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

Holcombe
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Re: Tailwheel Spring Pad(s)

Post by Holcombe » Tue Jun 14, 2011 07:29

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.
Tail winds are a "Good Thing"

Champ Dreamer
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Re: Tailwheel Spring Pad(s)

Post by Champ Dreamer » Tue Jun 14, 2011 14:40

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

sparky66
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Re: Tailwheel Spring Pad(s)

Post by sparky66 » Tue Jun 21, 2011 04:29

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 4095 times

Holcombe
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Re: Tailwheel Spring Pad(s)

Post by Holcombe » Tue Jun 21, 2011 08:28

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.
Tail winds are a "Good Thing"

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skyking3286
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Re: Tailwheel Spring Pad(s)

Post by skyking3286 » Wed Jun 22, 2011 09:02

Don't make it too complicated....Radiator hose material cut to shape works too.
Mark Peterson
Harvey Field, WA
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http://www.reocities.com/mrpeters.geo/index.html

MikeB
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Re: Tailwheel Spring Pad(s)

Post by MikeB » Wed Jun 22, 2011 10:04

I cut mine out of an old mudflap.
Mike

Paul Agaliotis
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Re: Tailwheel Spring Pad(s)

Post by Paul Agaliotis » Wed Jun 22, 2011 13:27

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

jepropst
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Re: Tailwheel Spring Pad(s)

Post by jepropst » Sat Jun 25, 2011 04:28

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

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sburke
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Re: Tailwheel Spring Pad(s)

Post by sburke » Tue Jun 28, 2011 20:20

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 3920 times
No Pads.jpg
No Pads.jpg (109.17 KiB) Viewed 3920 times
Sam Burke
Santa Ynez, CA
N6404C L16A 7BCM-296 USAF 47-1076 C85-12F
8056862323
sburke@charm.physics.ucsb.edu

sparky66
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Re: Tailwheel Spring Pad(s)

Post by sparky66 » Sun Jul 17, 2011 18:07

Good photos. It looks like there is one washer between the front of the spring and the fuselage. Is that correct?

sparky66
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Re: Tailwheel Spring Pad(s)

Post by sparky66 » Sun Jul 31, 2011 19:11

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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