REFLECTOR:Nose Wheel Shimmy Brake Problem (Update)

[Wayne Owens]

 I relocated some holes at the top of my old channel style nose gear mount
(fixed gear) so I now have 2 degrees negative caster when empty.

I did some high speed taxi test with two of us > #200 in the front. My
modification seems to eliminate the shimmy  (but I still have my break-out
lock just in case).  I tried bouncing the nose gear several times with and
without the nose gear locked. Felt no sign of shimmy.I think I may just have
a fix.
Wayne



----- Original Message ----- 
From: <Don19dw@aol.com>
To: <reflector@awpi.com>
Sent: Thursday, July 17, 2003 9:06 PM
Subject: REFLECTOR:Nose Wheel Shimmy Brake Problem (Update)


> So far have:
> Balanced and checked nose wheel tire for out of round.
> Adjusted main gear wheels for proper toe in and camber.
> Tightened  main gear and nose gear pivot bolts to minimize excess play
> Replaced nose gear fork as there was considerable wear in previous fork
> bushing.
> Tightened shimmy damper force on nose wheel well above numbers given by
> Velocity.
> The only item I can find out of spec is that the bottom end of the nose
gear
> strut tilts forward about 7 degrees (from vertical) and factory says it
should
> be about 2 degrees. Note: Adding weight to nose or braking causes the 7
> degrees to INCREASE.
>
> Still get some nose wheel shimmy (not real serious) around 20 to 30 mph.
(1)
> when applying fairly heavy braking and am alone in A/C. (2) when I have a
> front seat passenger without any braking ( applying brakes aggravates the
shimmy).
>
> Anyone out there having similar problems or have any suggestions?
>
> Don White  N19DW   XL/RG
>
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