Today's Message Index:
----------------------
1. 01:15 AM - Re: Nose Wheel Shimmy (Paul Hawkins)
2. 08:47 AM - Re: Re: Propeller? Gearbox? "Wow-wow-wow" resonance (D McFadyean)
Message 1
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| Subject: | Re: Nose Wheel Shimmy |
To kill shimmy 100% of the time full rudder preferably into wind but either
way the will break the nose-wheel swinging from side to side, in the past
I=99ve tried everything replacing parts raising the nosewheel and gen
tly let
down / slamming it down the only thing that works is catching it early with
full rudder the shimmy will stops immediately straighten up and continue
down the runway.
The key to not getting shimmy in the first place *never ever* pull the
power off just over the runway on short final, you=99ve got the speed
right
leave the power where it is until you land then kill the power or glide
onto the runway from height.
Cheers Paul
G-ROOV 914 XS
On Thu, 3 Sep 2020 at 22:30, Jeff B <topglock@cox.net> wrote:
>
> A little swipe of Nyogel 774VH on both sides of the fiber washer then
> torqued to spec will solve the problem.
>
> Jeff
>
> "I believe that forgiving them is God's function. Our job is to arrange
> the meeting."
>
> -Gen. Norman Schwarzkopf
>
> On 9/3/2020 11:58 AM, Matt Dovey wrote:
k
> >
> >
> > When landing on a hard runway I always get nose wheel shimmy. I've
> checked the friction on the on the nose wheel fork and found no problem.
> Has anyone else had similar problems?
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=498144#498144
> >
> >
> >
> >
> >
> >
> >
> >
> >
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Message 2
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| Subject: | Re: Propeller? Gearbox? "Wow-wow-wow" resonance |
Can also be a worn propshaft bearing(s), where the shaft is rotating in the bearing
(as normal) and simultaneously orbiting around the centre of that rotation
(allowed by radial play).
Duncan McF.
> On 19 June 2020 at 14:58 clivesutton <clive.maf@googlemail.com> wrote:
>
>
>
> Hi Jonathan, what you describe is 'Heterodyning' or 'Beat-frequency' created
by the difference between two noise or vibration frequencies very close together.
>
> Do you have a recording on e.g. a mobile phone that i could listen to - along
with the engine speeds in play at the time? And what about:-
>
> 1) How the frequency of 'wow-wow' change if you speed up or slow down the engine
a bit?
> 2) How does the 'wow-wow' effect change with Airspeed?
> 3) the CS mode idea is viable too - does it occur when that is turned off/the
prop is not trying to hunt for optimum speed vs pitch?
>
> It's impossible to say from just the description given, but assuming the above
items make a significant difference, my initial suspicions would be one prop
blade with a slightly different prop pitch to the others and/or blade tip tracking
differences between blades. Both of those parameters should be quite easy
to check on the ground (no engine running needed) and reporting any variation
you find?
>
> Clive
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=496930#496930
>
>
>
>
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>
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