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From: "Jeff Luckey" <JLuckey@pacbell.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: header parts source
Date: Tue, 19 Oct 2010 17:22:37 -0700
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I thought that people were commonly using 321 for Rotary exhaust systems
because it has a higher temp rating.

It's been a while, but I vaguely remember looking it up, and the max =
working
temps were something like this:

304 =3D 1200F
321 =3D 1600F

So, my question is, are people using 304 successfully for Rotary exhaust
systems.  If so, that's great, because it's cheaper & more readily
available.


-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ernest Christley
Sent: Tuesday, October 19, 2010 07:51
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: header parts source

Jeff Luckey wrote:
> Does Columbia now carry 321 stainless.  IIRC, I pinged them about a =
year=20
> ago and they did not carry 321 stainless=85
>=20
> =20

I also bought bends from Columbia.  Their service and delivery was
excellent.

I don't see any mention of 321, but I wasn't really concerned about it.
Given the diameter of tube we have to use for=20
exhaust flow, and the thickness we need to contain the exhaust pulse, =
and
the corrosion resistance characteristics of=20
the alloys at elevated temperatures, I couldn't see enough of a =
difference
to stress over.

>=20
> =
------------------------------------------------------------------------
>=20
> *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] =

> *On Behalf Of *kevin lane
> *Sent:* Monday, October 18, 2010 22:03
> *To:* Rotary motors in aircraft
> *Subject:* [FlyRotary] header parts source
>=20
> =20
>=20
> I have been happy with Columbia mandrel bending.  they make their own=20
> parts, family run, and significantly cheaper than burns. =20
> http://www.mandrel-bends.com/catalog/
>=20
> last week I finally got the v-band, another 90=B0, a flex joint, and=20
> muffler added to this header.
>=20
> =20
>=20
> =20
>=20
> KevinLane Carpentry
> www.KevinLaneCarpentry.com <http://www.KevinLaneCarpentry.com>
>=20


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