Paul and group,
The ball flange Paul shows is a good solution. Another I saw on a

factory exhaust system used a

solid stub into a expanded tube with "flying buttress" like blade

attached to the flange and tube.

A hole is drilled in the end of both parts for a Jet-nutted bolt. This

holds the tube tight and

expands at the same rate as the tube. I wish I could show you a drawing,

can you translate a

solidworks drawing into Rhino? This system avoided most of the pitfalls,

the only worry would be

leakage in a tractor config. Paul, for the spring system wouldn't an

700x spring hold up? Bill

Jepson

Yes. Send the Solid Works file as a stp file. Also the S.W. native file

version

and I will try that. You can also just do a screen capture (hit Prt Scrn

key)

and import it into MS Paint and save & send it as a .bmp file.

I doubt any spring could withstand 1700 F for long. PowerSport needs
to reprogram their EFI computer if they are running 1700 F during cruise.

Paul Lamar

Vance W Jaqua wrote:

Springs are frequently used on exhaust system "ball" joints. They survive
since the thermal
path has limited condutivity, and they are out in the free air (under
cowling) stream.
Vance J

They might on a 1400 F piston engine exhaust but I have my doubts 
at 1700 F on a rotary :)

Paul Lamar
 
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