Hey Stan: In addition to the items listed by Hartmut, you need to check the
following items inside the airplane: (while the weight is off the nose
gear)
chain and sprockets for excessive looseness (there should be about a
maximum of 1/2 inch of up and down play in the chain between the sprockets
on the column)
Control column for up and down play - there should be none (check it
with a good size screw driver, being careful not to damage the upper
bushing, by prying between the quadrant (item 40 figure 21 page 29 of Ercoupe
parts catalog) and the outer control column (item 35 same picture). Vertical
play is limited to .003, so if you can see any, it is too much.
play in the nose steering push rod (item 33 of the above picture)
bearing to control column
also when checking the steering collar on the nose strut for up and
down play, check the collar and sleeve (Item 4 and 5 of figure 14 page 18 of
parts catalog) for lateral play on the nose strut (there should be none)
I would also ask if this occurred suddenly, or gradually got worse
over time. As bad as it seems, something should have most likely been
fixed/replaced at the last annual.
Lynn Nelsen
In a message dated 7/28/2009 4:33:19 P.M. Eastern Daylight Time,
[email protected] writes:
Stan
Nice Video.
This illustrates the problem better than words can describe it.
You are experiencing nose wheel shimmy.
I would check from the tire toward the back the following items.
1. Tire itself (no flat spots?), wheel bearing not overly loose or worn?
The single bearing wheel should feel a little loose, that is ok, but if you
can move the tire by an inch to the left or right, that is not ok.
2. Nut cracker linkages. The bolts should be tight enough to not allow for
any play. If the bolts are tight and you are experiencing still play in
the linkages, check the bushings, they might be worn, - use new bolts.
3. steering collar of the strut. You should no be able to move the collar
up and down on the strut. There are shims for adjustments.
4. The steering socket ball. . Best is to have it replaced . (see also
_http://www.ercoupe.info/?n=Main.Steering_
(http://www.ercoupe.info/?n=Main.Steering) )
5. check for looseness of the steering rod in the steering column.
Sometimes the lower bushing of the steering column is worn .- this feels like
extra play in the Heim bearing of the steering rod. It is either way, or both.
(_http://www.ercoupe.info/?n=Main.PushRodBearings_
(http://www.ercoupe.info/?n=Main.PushRodBearings) )
Everything within the steering should be working smooth but without any
click clack play.
Best to check is it either by lowering the tail with weights or a helper
and rocking the linkages back and forth, or by having a helper putting
slight pressure on the controls inside the plane , while you are watching and
feeling. The helper should just gently go back and forth with the controls.
Little is a lot here. The nose is this time on the ground.
Good luck
Hartmut
____________________________________
To: [email protected]
From: [email protected]
Date: Tue, 28 Jul 2009 09:28:04 -0700
Subject: Fw: [ercoupe-tech] nose wheel problem
Stan French
--- On Tue, 7/28/09, Stanley French <stanfre...@sbcglobastanf> wrote:
From: Stanley French <stanfre...@sbcglobastanf>
Subject: [ercoupe-tech] nose wheel problem
To: ercoupe-t...@to: ercoupe-To:
Date: Tuesday, July 28, 2009, 4:24 PM
If anyone can shed some light on what my problem with the nose wheel is I
would appreciate it. I flew this landing with 17 to 18 lbs in the nose
tire. As you can see I landed on the mains, set down on the nose, rolled 300
to 400 feet and then it almost felt like it was going to break off until I
got to about 15mph.
Stan French
To: stanfre...@sbcgloba l.net
Date: Tuesday, July 28, 2009, 3:10 AM
Message from stanfrench:
Click on a video below to watch it:
(http://sharing.theflip.com/session/6e11353b9d9e6858b9a4bf8f52054e5b/video/5315173)
Coupe shaking
Video Length 0:53
_Click here to watch_
(http://sharing.theflip.com/session/6e11353b9d9e6858b9a4bf8f52054e5b/video/5315173)
(http://www.theflip.com/)
To learn more about the Flip Video Camcorder, _click here_
(http://www.theflip.com/) .
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