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Date: Sun, 21 Mar 2010 11:30:39 -0500
Message-ID: <5cf132c1003210930v54dfbd4dje574a7439bcd24c1@mail.gmail.com>
Subject: Re: [FlyRotary] Re: Fwd: Question on RD2-C
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=0015174c19ead538bc04825219bc

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Al,

Bolts were AN3-6A, but not of the close tolerance variety... not a bad idea
though.  Does Van's sell those?

Mark S.

On Sun, Mar 21, 2010 at 10:53 AM, Al Gietzen <ALVentures@cox.net> wrote:

>   The rivets are aluminum.
>
>
>
> I find this surprising, as well as disappointing.
>
>
>
> I checked the rivets on my RD2-C damper assembly and was able to confirm
> that they were in fact beginning to loosen as evidenced by the radial
> streaks on the damper plate.  I picked four rivets at random, approx. 90
> degrees apart, and grabbed the shop heads with vice grips and tried to sp=
in
> them.  All four would spin with little effort, thus confirming that they
> were beginning to loosen.  After a phone call to Tracy, we decided to
> replace the ring of rivets with AN3 bolts, which I've now done.
>
> One advantage to rivets is that they fill the holes to zero tolerance.  T=
he
> bolts will be MUCH stronger, but I=92m wondering about the potential for =
some
> very small amount of =91play=92 to begin with, which would not be a good =
thing.
> I don=92t know much about steel rivets, but maybe that=92s the way to go.
>
>
>
> Mark; what nominal length and grip length on the bolts? Are you using
> standard AN bolts or are there =91true=92 diameter or =91close tolerance=
=92 bolts
> available.
>
>
>
> Al
>
>
>
> Hum-m-m; I just decided I could change schedules in order to fly to the
> Jean, NV gathering next week. Now I=92m wondering whether to fly anywhere
> before changing out the rivets. I=92m thinking that since I see no moveme=
nt
> between flange and plate after 180 hours, it should be good for at least =
a
> few more hours.
>
>
>

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Al,<div><br><div>Bolts were AN3-6A, but not of the close tolerance variety.=
.. not a bad idea though. =A0Does Van&#39;s sell those? =A0</div><div><br><=
/div><div>Mark S.<br><br><div class=3D"gmail_quote">On Sun, Mar 21, 2010 at=
 10:53 AM, Al Gietzen <span dir=3D"ltr">&lt;<a href=3D"mailto:ALVentures@co=
x.net">ALVentures@cox.net</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"blue">

<div>

<div>

<div>

<p class=3D"MsoNormal"><font size=3D"3" face=3D"Times New Roman"><span styl=
e=3D"font-size:12.0pt">The rivets are aluminum.=A0</span></font></p>

<p class=3D"MsoNormal"><font size=3D"3" face=3D"Times New Roman"><span styl=
e=3D"font-size:12.0pt">=A0</span></font></p>

<p class=3D"MsoNormal"><font size=3D"2" face=3D"Verdana"><span style=3D"fon=
t-size:11.0pt;font-family:Verdana">I find this surprising, as well as disap=
pointing.</span></font></p>

<p class=3D"MsoNormal" style=3D"margin-left:.5in"><font size=3D"3" color=3D=
"blue" face=3D"Times New Roman"><span style=3D"font-size:12.0pt;color:blue"=
>=A0</span></font></p>

</div>

<div>

<div>

<div>

<p class=3D"MsoNormal" style=3D"margin-left:.5in"><font size=3D"3" face=3D"=
Times New Roman"><span style=3D"font-size:12.0pt">I checked the rivets on m=
y RD2-C damper assembly and
was able to confirm that they were in fact beginning to loosen as evidenced=
 by
the radial streaks on the damper plate. =A0I picked four rivets at random,
approx. 90 degrees apart, and grabbed the shop heads with vice grips and tr=
ied
to spin them. =A0All four would spin with little effort, thus confirming
that they were beginning to loosen. =A0After a phone call to </span></font>=
Tracy,
we decided to replace the ring of rivets with AN3 bolts, which I&#39;ve now=
 done<font color=3D"blue"><span style=3D"color:blue">.</span></font></p>

<p class=3D"MsoNormal"><font size=3D"2" color=3D"blue" face=3D"Verdana"><sp=
an style=3D"font-size:11.0pt;font-family:Verdana;color:blue">One advantage =
to rivets is that they
fill the holes to zero tolerance. =A0The bolts will be MUCH stronger, but I=
=92m
wondering about the potential for some very small amount of =91play=92
to begin with, which would not be a good thing.=A0 I don=92t know much
about steel rivets, but maybe that=92s the way to go. =A0</span></font></p>

<p class=3D"MsoNormal"><font size=3D"2" color=3D"blue" face=3D"Verdana"><sp=
an style=3D"font-size:11.0pt;font-family:Verdana;color:blue">=A0</span></fo=
nt></p>

<p class=3D"MsoNormal"><font size=3D"2" color=3D"blue" face=3D"Verdana"><sp=
an style=3D"font-size:11.0pt;font-family:Verdana;color:blue">Mark; what nom=
inal length and grip
length on the bolts? Are you using standard AN bolts or are there =91true=
=92
diameter or =91close tolerance=92 bolts available.</span></font></p>

<p class=3D"MsoNormal"><font size=3D"2" color=3D"blue" face=3D"Verdana"><sp=
an style=3D"font-size:11.0pt;font-family:Verdana;color:blue">=A0</span></fo=
nt></p>

<p class=3D"MsoNormal"><font size=3D"2" color=3D"blue" face=3D"Verdana"><sp=
an style=3D"font-size:11.0pt;font-family:Verdana;color:blue">Al</span></fon=
t></p>

<p class=3D"MsoNormal"><font size=3D"2" color=3D"blue" face=3D"Verdana"><sp=
an style=3D"font-size:11.0pt;font-family:Verdana;color:blue">=A0</span></fo=
nt></p>

<p class=3D"MsoNormal"><font size=3D"2" color=3D"blue" face=3D"Verdana"><sp=
an style=3D"font-size:11.0pt;font-family:Verdana;color:blue">Hum-m-m; I jus=
t decided I could change
schedules in order to fly to the Jean, NV gathering next week. Now I=92m
wondering whether to fly anywhere before changing out the rivets. I=92m
thinking that since I see no movement between flange and plate after 180 ho=
urs,
it should be good for at least a few more hours.</span></font></p>

</div>

</div>

</div>

</div>

<p class=3D"MsoNormal" style=3D"margin-left:.5in"><font size=3D"3" face=3D"=
Times New Roman"><span style=3D"font-size:12.0pt">=A0</span></font></p>

</div>

</div>


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

--0015174c19ead538bc04825219bc--