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Date: Thu, 6 Jan 2005 13:29:56 -0500
Subject: Re: [FlyRotary] exhaust port shape
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From: Jerry Hey <j-winddesigns@thegrid.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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Message-Id: <F6F60BF6-6010-11D9-AF7F-0003931B0C7A@thegrid.net>
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--Apple-Mail-2-27461148
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Kevin, what I am doing  is  welding the 2" o.d. pipe  to the flange on=20=

the inside. This should be a 360 degree weld.  Then use your die=20
grinder to knock down the bead and make a smooth path for the exhaust=20
gas.  On the  outside of the flange, just weld in three or four places=20=

(one inch long welds)  to provide  good   structure, while at the same=20=

time allowing  room for expansion and contraction.      Jerry


On Thursday, January 6, 2005, at 01:08  PM, kevin lane wrote:

> I decided to have my exhaust flanges recut to better match the ports.=A0=
=20
> Originally I simply had a 2" dia hole.=A0 How important is it to match=20=

> the shape of the ports, which is a collection of radiuses, straight=20
> sides, fillets and even a sort of non-tangential "fillet".=A0 It =
appears=20
> that a 1 7/8" OD tube could be hammered to match this shape if I had=20=

> it cut in the flange.=A0 A 2" OD tube left round=A0also looks like it=20=

> would cover the port, but would leave edges where the straight edges=20=

> of the port would dump into a round pipe.=A0 These areas are very=20
> small.=A0 My welder says that he routinely hammers exhaust pipes into=20=

> "square" shapes, that the ports usually aren't round anyways.=A0 He =
can=20
> stretch the pipe to a bigger dia., although I don't think that is a=20
> great idea, despite my using 1/16" wall 321 s/s.=A0 I realize that I=20=

> don't want the exhaust gas to collide with a smaller exhaust pipe=20
> shape, but what about a larger size?=A0 Is it OK to spill into a=20
> slightly larger size?=A0 Am I worrying too much about a small detail, =
or=20
> is this worth the time and effort?
> Kevin Lane=A0 Portland, OR
> e-mail-> n3773@comcast.net
> web-> http://home.comcast.net/~n3773
> (browse w/ internet explorer)

--Apple-Mail-2-27461148
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	charset=ISO-8859-1

Kevin, what I am doing  is  welding the 2" o.d. pipe  to the flange on
the inside. This should be a 360 degree weld.  Then use your die
grinder to knock down the bead and make a smooth path for the exhaust
gas.  On the  outside of the flange, just weld in three or four places
(one inch long welds)  to provide  good   structure, while at the same
time allowing  room for expansion and contraction.      Jerry



On Thursday, January 6, 2005, at 01:08  PM, kevin lane wrote:


<excerpt><fontfamily><param>Comic Sans =
MS</param><color><param>0000,0000,0000</param><bigger>I
decided to have my exhaust flanges recut to better match the ports.=A0
Originally I simply had a 2" dia hole.=A0 How important is it to match
the shape of the ports, which is a collection of radiuses, straight
sides, fillets and even a sort of non-tangential "fillet".=A0 It appears
that a 1 7/8" OD tube could be hammered to match this shape if I had
it cut in the flange.=A0 A 2" OD tube left round=A0also looks like it
would cover the port, but would leave edges where the straight edges
of the port would dump into a round pipe.=A0 These areas are very
small.=A0 My welder says that he routinely hammers exhaust pipes into
"square" shapes, that the ports usually aren't round anyways.=A0 He can
stretch the pipe to a bigger dia., although I don't think that is a
great idea, despite my using 1/16" wall 321 s/s.=A0 I realize that I
don't want the exhaust gas to collide with a smaller exhaust pipe
shape, but what about a larger size?=A0 Is it OK to spill into a
slightly larger size?=A0 Am I worrying too much about a small detail, or
is this worth the time and =
effort?</bigger></color></fontfamily><color><param>0000,0000,0000</param>

<fontfamily><param>Arial</param><smaller>Kevin Lane=A0 Portland, OR

e-mail->
=
</smaller></fontfamily></color><underline><fontfamily><param>Arial</param>=
<color><param>1999,1999,FFFF</param><smaller>n3773@comcast.net

=
</smaller></color></fontfamily></underline><fontfamily><param>Arial</param=
><color><param>0000,0000,0000</param><smaller>web->
=
</smaller></color><underline><color><param>1999,1999,FFFF</param><smaller>=
http://home.comcast.net/~n3773

=
</smaller></color></underline><color><param>0000,0000,0000</param><smaller=
>(browse
w/ internet =
explorer)</smaller></color></fontfamily><color><param>0000,0000,0000</para=
m>

</color></excerpt>=

--Apple-Mail-2-27461148--