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Date: Mon, 14 Mar 2011 19:54:32 -0500
Message-ID: <AANLkTim7Y86Jcuo9NbnGwf23FHnAVRuFWtX07Dh2CakD@mail.gmail.com>
Subject: Re: [FlyRotary] Re: Cracking exhaust manifolds/ Crankcase ventilation
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=0016e68ba2660c6a42049e7adfd5

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Marc,

That's correct.  Also called disc springs.  See
http://www.mcmaster.com/#disc-springs/=bfpb1d

Mark

On Mon, Mar 14, 2011 at 7:11 PM, Marc Wiese <cardmarc@charter.net> wrote:

> Do you mean Belleville constant torque washer stacks? Like are used on some
> wood props?
>
> Marc
>
>
>
> *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] *On
> Behalf Of *Lehanover@aol.com
> *Sent:* Sunday, March 13, 2011 6:48 PM
> *To:* Rotary motors in aircraft
> *Subject:* [FlyRotary] Re: Cracking exhaust manifolds/ Crankcase
> ventilation
>
>
>
> In a message dated 3/13/2011 6:56:23 P.M. Eastern Daylight Time,
> fluffysheap@gmail.com writes:
>
>  On my home spun exhaust for my 3-rotor, I tighten the exhaust studs for
> the center rotor, but only snug down the bolts for #1 and #3 in order to
> allow the exhaust manifold to grow and shrink as necessary.  With 1600-1700*
> EGT's, it seems obvious that the manifold will grow more than the engine and
> if not allowed to move, it will crack.  By torquing them only enough to
> prevent leakage, they are allowed to grow as needed, preventing cracks.  So
> far, no broken studs or cracked exhaust manifold on my 3-rotor.
>
>
>
> Mark S.
>
>
>
> Bingo.
>
>
>
> How about you torque up the center most stud to auto spec, then use 2 bevel
> washers flange to flange pulled down just short of flat on all other studs.
>
>
>
> Then use a short stack of bevel washers above and below a flange on the
> turbo setup to a strut to support the weight and keep the strain off of the
> manifold.
>
>
>
> Lynn E. Hanover
>
>
>

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Marc,<div><br></div><div>That&#39;s correct. =A0Also called disc springs. =
=A0See=A0<a href=3D"http://www.mcmaster.com/#disc-springs/=3Dbfpb1d">http:/=
/www.mcmaster.com/#disc-springs/=3Dbfpb1d</a><br><br></div><div>Mark</div><=
div><br><div class=3D"gmail_quote">
On Mon, Mar 14, 2011 at 7:11 PM, Marc Wiese <span dir=3D"ltr">&lt;<a href=
=3D"mailto:cardmarc@charter.net">cardmarc@charter.net</a>&gt;</span> wrote:=
<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-lef=
t:1px #ccc solid;padding-left:1ex;">
<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div><p class=3D"MsoNorm=
al"><span style=3D"color:#1F497D">Do you mean Belleville constant torque wa=
sher stacks? Like are used on some wood props?</span></p><p class=3D"MsoNor=
mal"><span style=3D"color:#1F497D">Marc</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">=A0</span></p><div><di=
v style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in=
 0in"><p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt">From:</spa=
n></b><span style=3D"font-size:10.0pt"> Rotary motors in aircraft [mailto:<=
a href=3D"mailto:flyrotary@lancaironline.net" target=3D"_blank">flyrotary@l=
ancaironline.net</a>] <b>On Behalf Of </b><a href=3D"mailto:Lehanover@aol.c=
om" target=3D"_blank">Lehanover@aol.com</a><br>
<b>Sent:</b> Sunday, March 13, 2011 6:48 PM<br><b>To:</b> Rotary motors in =
aircraft<br><b>Subject:</b> [FlyRotary] Re: Cracking exhaust manifolds/ Cra=
nkcase ventilation</span></p></div></div><p class=3D"MsoNormal">=A0</p><div=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:black">In a me=
ssage dated 3/13/2011 6:56:23 P.M. Eastern Daylight Time, <a href=3D"mailto=
:fluffysheap@gmail.com" target=3D"_blank">fluffysheap@gmail.com</a> writes:=
</span></p>
</div><blockquote style=3D"border:none;border-left:solid blue 1.5pt;padding=
:0in 0in 0in 4.0pt;margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt"=
><p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:black">=A0On =
my home spun exhaust for my 3-rotor, I tighten the exhaust studs for the ce=
nter rotor, but only snug down the bolts for #1 and #3 in order to allow th=
e exhaust manifold to grow and shrink as necessary. =A0With 1600-1700* EGT&=
#39;s, it seems obvious that the manifold will grow more than the engine an=
d if not allowed to move, it will crack. =A0By torquing them only enough to=
 prevent leakage, they are allowed to grow as needed, preventing cracks. =
=A0So far, no broken studs or cracked exhaust manifold on my 3-rotor. =A0 <=
/span></p>
<div><p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:black">=
=A0</span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-size:10=
.0pt;color:black">Mark S.</span></p></div></blockquote><div><p class=3D"Mso=
Normal"><span style=3D"font-size:10.0pt;color:black">=A0</span></p>
</div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:bla=
ck">Bingo.</span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-=
size:10.0pt;color:black">=A0</span></p></div><div><p class=3D"MsoNormal"><s=
pan style=3D"font-size:10.0pt;color:black">How about you torque up the cent=
er most stud to auto spec, then use 2 bevel washers flange to flange pulled=
 down just short of flat on all other studs.</span></p>
</div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:bla=
ck">=A0</span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-siz=
e:10.0pt;color:black">Then use a short stack of bevel washers above and bel=
ow a flange on the turbo setup to a strut to support the weight and keep th=
e strain off of the manifold.</span></p>
</div><div><p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;color:bla=
ck">=A0</span></p></div><div><p class=3D"MsoNormal"><span style=3D"font-siz=
e:10.0pt;color:black">Lynn E. Hanover</span></p></div><div><p class=3D"MsoN=
ormal"><span style=3D"font-size:10.0pt;color:black">=A0</span></p>
</div></div></div></blockquote></div><br></div>

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