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Message-ID: <1c23473f05072020104dd00d8@mail.gmail.com>
Date: Wed, 20 Jul 2005 20:10:57 -0700
From: David Leonard <wdleonard@gmail.com>
Reply-To: David Leonard <wdleonard@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: RD-1B failure
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Tracy,
 You had me freaking out because I don't remember any such washer....
 Yet, you hit the nail on the head once again... At least you know your=20
stuff. The failure is indeed the pin in the sun gear. I am not sure which=
=20
version I have, but it looks to me like the pin broke in shear. There is=20
nothing to see from the outside and I think I have the pin version not the=
=20
welded version. I will send a picture shortly for you to verify. Either way=
,=20
it is the 2 halves of the sun gear that are no longer connected.
 Dave

 On 7/20/05, Tracy Crook <lors01@msn.com> wrote:=20
>=20
>    >SNIP<
> The big question is: since the drive is going back to Tracy soon, should =
I=20
> switch to the RD-1C or stick with the B-model
> --=20
> Dave Leonard
>   Poo.. Brain fade. Ignore everything I said earlier. I was thinking you=
=20
> had a -C drive already.=20
>  Tracy (back to square 1 on failure hypothesis)
>  Next possible thing is rosette weld failure on sun gear. I switched to=
=20
> drilled & pined gear some time ago when I thought of this as a possible=
=20
> failure mode. Which do you have Dave? Backfire *would* be the most likely=
=20
> thing to induce that.=20
>  Tracy (still thinking about it)
>=20



--=20
Dave Leonard
Turbo Rotary RV-6 N4VY
http://members.aol.com/_ht_a/rotaryroster/index.html
http://members.aol.com/vp4skydoc/index.html

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<div>Tracy,</div>
<div>&nbsp;</div>
<div>You had me freaking out because I don't remember any such washer....</=
div>
<div>&nbsp;</div>
<div>Yet, you hit the nail on the head once again...&nbsp; At least you kno=
w your stuff.&nbsp;&nbsp;The failure is indeed the pin in the sun gear.&nbs=
p; I am not sure which version I have, but it looks to me like the pin brok=
e in shear.&nbsp; There is nothing to see from the outside and I think I ha=
ve the pin version not the welded&nbsp;version.&nbsp; I will send a picture=
 shortly for you to verify.&nbsp; Either way, it is the 2 halves of the sun=
 gear that are no longer connected.
</div>
<div>&nbsp;</div>
<div>Dave<br><br>&nbsp;</div>
<div><span class=3D"gmail_quote">On 7/20/05, <b class=3D"gmail_sendername">=
Tracy Crook</b> &lt;<a href=3D"mailto:lors01@msn.com">lors01@msn.com</a>&gt=
; wrote:</span>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div>
<div>&nbsp;</div>
<div>&nbsp;</div>
<div>&gt;SNIP&lt;</div>
<div>The big question is: since the drive is going back to Tracy soon, shou=
ld I switch to the RD-1C or stick with the B-model</div>
<div>-- <br>Dave Leonard<br>&nbsp;</div>
<div>&nbsp;</div>
<div>Poo..&nbsp; Brain fade.&nbsp; Ignore everything I said earlier.&nbsp; =
I was thinking you had a -C drive already.&nbsp;</div>
<div>&nbsp;</div>
<div>Tracy&nbsp; (back to square 1 on failure hypothesis)</div>
<div>&nbsp;</div>
<div>Next possible&nbsp;thing is rosette weld failure on sun gear.&nbsp; I =
switched to drilled &amp; pined gear some time ago when I thought of this a=
s a possible failure mode.&nbsp;&nbsp;Which do you have Dave?&nbsp; Backfir=
e *would* be the most likely thing to induce that.&nbsp;=20
</div>
<div>&nbsp;</div>
<div>Tracy (still thinking about it)</div></div></blockquote></div><br><br>=
<br>-- <br>Dave Leonard<br>Turbo Rotary RV-6 N4VY<br><a href=3D"http://memb=
ers.aol.com/_ht_a/rotaryroster/index.html">http://members.aol.com/_ht_a/rot=
aryroster/index.html
</a><br><a href=3D"http://members.aol.com/vp4skydoc/index.html">http://memb=
ers.aol.com/vp4skydoc/index.html</a>=20

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