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Subject: RE: [FlyRotary] Re: Joe Hull's OSH Trip - Part 2
Date: Wed, 26 Jul 2006 10:49:58 -0500
Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E0531F517@MAIL01.austin.utexas.edu>
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Thread-Topic: [FlyRotary] Re: Joe Hull's OSH Trip - Part 2
Thread-Index: AcawyLPeiyih23q5SK2cOrrmtwZ/zQAAikmw
From: "Mark R Steitle" <mark.steitle@austin.utexas.edu>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Bob,
I can't tell from the picture, but are the short tubes welded on the
backside or the outside, or both.  If they are welded on the outside,
that's where I would guess the cracks would show up first. =20

Mark S.=20

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Bob White
Sent: Wednesday, July 26, 2006 10:33 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Joe Hull's OSH Trip - Part 2

Hi Mark,

Your system has a little more room to flex than mine.  I think the most
likely place I will see a crack is where the short tube are welded to
the large can.

Bob W.

On Wed, 26 Jul 2006 09:49:10 -0500
"Mark R Steitle" <mark.steitle@austin.utexas.edu> wrote:

> Finn,=20
>=20
> =20
>=20
> Maybe that's why some of the aftermarket flanges are one piece.
That's
> how I made mine for that very reason.  So far, so good.
>=20
> =20
>=20
> Mark S.
>=20
> =20
>=20
> ________________________________
>=20
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
On
> Behalf Of Finn Lassen
> Sent: Wednesday, July 26, 2006 9:37 AM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Joe Hull's OSH Trip - Part 2
>=20
> =20
>=20
> Ground running won't necessarily get you into that thermo cycle range.
> Seems you consistently have to get above 5,000 RPM before anything
> happens.
>=20
> No expansion joints: it will crack.
> Unless you use ridiculously thick material. Which is probably why the
> stock Mazda manifold is so heavy.
>=20
> Finn
>=20
>=20
>=20
>=20
>=20


--=20
http://www.bob-white.com
N93BD - Rotary Powered BD-4 (first engine start 1/7/06)
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