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From: Dan O'Brien <limadelta@gmail.com>
Reply-To: limadelta@gmail.com
X-Original-To: Lancair Mailing List <lml@lancaironline.net>
Subject: Re: [LML] landing speeds,tire pressures
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The notion that having more surface area on the ground increases friction=
=20
and should dampen shimmy makes sense to me --- friction induced dampening.=
=20
Yet, others say increasing the pressure makes shimmy go away. What gives?

The apparently black art nature of this beast called shimmy is very=20
frustrating. Could it be that changes either up or down in pressure from=20
shimmy-prone pressures change the oscillation frequency so as to avoid=20
hitting the frequency that develops into shimmy?

There must be answers to these questions.

Baffled.

On 9/12/05, ken C <kbcov@northlink.com> wrote:
>=20
> I was told when building my 360 to keep tire pressure in the nose gear=20
> between 28&32 ibs.In my E.S. I put max.35 lbs.and have never had a proble=
m=20
> in shimmy or tire wear.It only makes sense the more friction on the runwa=
y=20
> the less chance of shimmy.55lbs is way to much.
> In my E.S. I try to have 80kts fence speed.Makes for smoother=20
> touchdowns.On short field 70kts and it will settle much faster.I very=20
> seldom use full flaps.
> I also noticed in the brochure stall speeds @ 57 m.p.h.And my stalls were=
=20
> indicating 57kts.I installed stall strips,and get a tad indication before=
=20
> brake,which I must admit is very mild.I can hold the stall for a long tim=
e=20
> with rudder.The diff.between clean and dirty is minimal.
> Ken Covington E.S. N550kb
>

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The notion that having more surface area on the ground increases
friction and should dampen shimmy makes sense to me --- friction
induced dampening.&nbsp; Yet, others say increasing the pressure makes
shimmy go away.&nbsp; What gives?<br>
<br>
The apparently black art nature of this beast called shimmy is very
frustrating.&nbsp; Could it be that changes either up or down in
pressure from shimmy-prone pressures change the oscillation frequency
so as to avoid hitting the frequency that develops into shimmy?<br>
<br>
There must be answers to these questions.<br>
<br>
Baffled.<br><br><div><span class=3D"gmail_quote">On 9/12/05, <b class=3D"gm=
ail_sendername">ken C</b> &lt;<a href=3D"mailto:kbcov@northlink.com">kbcov@=
northlink.com</a>&gt; wrote:</span><blockquote class=3D"gmail_quote" style=
=3D"border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; p=
adding-left: 1ex;">







<div><font face=3D"Arial" size=3D"2">I was told when building my 360&nbsp;t=
o keep tire=20
pressure in the nose gear between 28&amp;32 ibs.In my E.S. I put max.35 lbs=
.and=20
have never had a problem in shimmy or tire wear.It only makes sense the mor=
e=20
friction on the runway the less chance of shimmy.55lbs is way to=20
much.</font></div>
<div><font face=3D"Arial" size=3D"2">In my E.S. I try to have 80kts fence s=
peed.Makes=20
for smoother touchdowns.On short field 70kts and it will settle much faster=
.I=20
very seldom use full flaps.</font></div>
<div><font face=3D"Arial" size=3D"2">I also noticed in the brochure stall s=
peeds @ 57=20
m.p.h.And my stalls were indicating 57kts.I installed stall strips,and get =
a tad=20
indication before brake,which I must admit is very mild.I can hold the stal=
l for=20
a long time with rudder.The diff.between clean and dirty is=20
minimal.</font></div>
<div><font face=3D"Arial" size=3D"2">Ken Covington&nbsp; E.S.&nbsp;=20
N550kb</font></div>

</blockquote></div><br>

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