Jeff,
I have the same problem with my spam can (Cessna 152). If I taxi too
fast the nose wheel will start to shimmy and I have to come to an almost
complete stop to get it to track straight. If I taxi reasonable slow like
maybe ten miles an hour, I have no problem. On landing and take off, I keep
the nose wheel of the runway as well as I can until the speed is enough for
take off or when landing I keep the yoke back as long as I can so I am
slowed down before the nose wheel touches. My aircraft is equipped with a
shimmy dampener and as far as I can see nothing is wrong with it.
Bob Stone, Harker Heights, Tx
rsto...@hot.rr.com
----- Original Message -----
From: <jeffyor...@qx.net>
To: "KRnet" <kr...@mylist.net>
Sent: Monday, September 19, 2005 8:30 AM
Subject: KR> Nose Gear question
> OK, So I may not supply quite enough info for a complete evaluation but, I
> am going to try and get your alls advise.
>
> Yesterday when I went to rotate to take off, just at or before the nose
> gear lifted, I felt a pretty significant shimmy in the nose gear. The nose
> came up and the airplane lifted off. I decided to pull the power and set
> back down. I pulled the power, let the plane sit back down and upon the
> nose gear touch down, the shimmy came back but much worse. I was actually
> wondering if it was the nose wheel or something significantly out of
> balance with the engine.
> I never really looked at the air speed indicator but I looked at the tach
> and noticed that I still had 2200 RPM and was having a difficult time
> getting the RPM's to come down. I have the vernier ( screw in and out )
> type throttle so I began back screwing the throttle. Everything finally
> slowed down and I taxied off and back to my hanger.
>
> Upon inspection of the nose wheel it appears that the bolt that appears to
> hold the little coil spring posts centered, has bent. Or maybe it was bent
> before I started. I also want to point out that the free castering nose
> wheel self centers when you lift up on the front end, a test I was told
> indicates that you have the right tension and such on the nose wheel. In
> testing a couple of them at the gathering, I noticed they did not self
> center and those owners indicated they had no shimmy issues. By the way
> that information was not meant as any criticism of anyone else's KR. I
> just wanted to compare my nose gear adjustment to others while there.
>
> Here is my question. Did I let the nose gear touch down with to much speed
> thus precipitating the shimmy? Did I do a poor preflight and this
> centering bolt was already bent ( Slightly, spring still looks to still be
> contained ) ?
>
> Is it possible that I let the plane stay planted to long and had to mush
> speed before I pulled the nose wheel come up? Thus precipitated the whole
> thing. Maybe I need to look at the nose gear at the point of the engine
> mount / fire wall?
>
> Your thoughts experiences?
>
> Jeff York
> KR-2 Flying
> N839BG
> Home page http//:web.qx.net/jeffyork40/
> My KR-2 http://web.qx.net/jeffyork40/Airplane/ to see my KR-2
> Email jeffyor...@qx.net
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