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Message-ID: <r2y5cf132c1004150827rc04e6599g87f8d5d0c9c94bfc@mail.gmail.com>
Subject: Re: [FlyRotary] Weird sound during descent
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=0016e64942ba0ae4270484482297

--0016e64942ba0ae4270484482297
Content-Type: text/plain; charset=windows-1252
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Jeff,

From my experience, the first place I would look is at the muffler.

Mark S.


On Thu, Apr 15, 2010 at 10:13 AM, Jeff Whaley <jwhaley@datacast.com> wrote:

>  I have been hearing a weird buzzing sound usually detectable on base leg
> at low power settings.  It is hard to describe in text but is repeatedly =
as
> zzuuzz, zzuuzz, zzuuzz .
>
> I thought it was wind noise escaping between the fuselage and gear legs, =
as
> there are no fairings between the fuselage and top of the cub-style gear.
>
> Last night it was bit bumpy and during one descent there was a good bump
> that lifted me against the seat belts -- the noise stopped.
>
> Tracy had cautioned me against low power steeps descents, something about
> thrust bearing and/or snubber =96 maybe refresh me on that one Tracy?
>
> However, an approach speed of 500 fpm, 80 mph, 3000 rpm, mp <10=94, is no=
t
> what I=92d consider steep.
>
>
>
> Anyone care to give me a clue as to what I might be hearing?
>
> If I get a chance to fly this weekend, I=92ll experiment to see if I can
> stop/change the noise with speed or attitude adjustments.
>
> Jeff
>
>
> __________ Information from ESET NOD32 Antivirus, version of virus
> signature database 5031 (20100415) __________
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> The message was checked by ESET NOD32 Antivirus.
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>

--0016e64942ba0ae4270484482297
Content-Type: text/html; charset=windows-1252
Content-Transfer-Encoding: quoted-printable

Jeff,<div><br></div><div>From my experience, the first place I would look i=
s at the muffler. =A0</div><div><br></div><div>Mark S.</div><div><br><br><d=
iv class=3D"gmail_quote">On Thu, Apr 15, 2010 at 10:13 AM, Jeff Whaley <spa=
n dir=3D"ltr">&lt;<a href=3D"mailto:jwhaley@datacast.com">jwhaley@datacast.=
com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex;">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div>
<p class=3D"MsoNormal">I have been hearing a weird buzzing sound usually de=
tectable on base leg at low power settings.=A0 It is hard to describe in te=
xt but is repeatedly as zzuuzz, zzuuzz, zzuuzz .</p>
<p class=3D"MsoNormal">I thought it was wind noise escaping between the fus=
elage and gear legs, as there are no fairings between the fuselage and top =
of the cub-style gear.</p>
<p class=3D"MsoNormal">Last night it was bit bumpy and during one descent t=
here was a good bump that lifted me against the seat belts -- the noise sto=
pped.</p>
<p class=3D"MsoNormal">Tracy had cautioned me against low power steeps desc=
ents, something about thrust bearing and/or snubber =96 maybe refresh me on=
 that one Tracy?</p>
<p class=3D"MsoNormal">However, an approach speed of 500 fpm, 80 mph, 3000 =
rpm, mp &lt;10=94, is not what I=92d consider steep.
</p>
<p class=3D"MsoNormal">=A0</p>
<p class=3D"MsoNormal">Anyone care to give me a clue as to what I might be =
hearing?</p>
<p class=3D"MsoNormal">If I get a chance to fly this weekend, I=92ll experi=
ment to see if I can stop/change the noise with speed or attitude adjustmen=
ts.
</p>
<p class=3D"MsoNormal">Jeff</p>
</div>
<br>
<br>
__________ Information from ESET NOD32 Antivirus, version of virus signatur=
e database 5031 (20100415) __________<br>
<br>
The message was checked by ESET NOD32 Antivirus.<br>
<br>
<a href=3D"http://www.eset.com" target=3D"_blank">http://www.eset.com</a><b=
r>
<br>
<font face=3D"Arial" color=3D"Black" size=3D"1">This message, and the docum=
ents attached hereto, is intended only for the addressee and may contain pr=
ivileged or confidential information. Any unauthorized disclosure is strict=
ly prohibited. If you have received this
 message in error, please notify us immediately so that we may correct our =
internal records. Please then delete the original message. Thank you.<br>
</font>
</div>

</blockquote></div><br></div>

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