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Date: Wed, 26 Jul 2006 17:29:34 -0600
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Joe Hull's OSH Trip - Part 2
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Hi Mark,

I'm guessing you are asking about the weld of the short tube to the
flange. It's welded on the back side and tacked in a couple of places
on the front. The weld from the short tubing to the big can is 0.065
welded to 0.065 so I expect it's a full penetration weld at that point.

Bob W.

On Wed, 26 Jul 2006 10:49:58 -0500
"Mark R Steitle" <mark.steitle@austin.utexas.edu> wrote:

> 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
> > 
> > 
> > 
> > 
> > 
> 
> 


-- 
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