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.  Mark S. -----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, > >  > > 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.
> >  > > Mark S.
> >  > > ________________________________
> > 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
> >  > > 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.
> > No expansion joints: it will crack.
> Unless you use ridiculously thick material. Which is probably why the
> stock Mazda manifold is so heavy.
> > Finn
> > > > >