Archie wrote:

 In hard core racing, the same problems arose a number of years ago,
 mostly in funny cars, but dragsters also. The common denominator,
 other than various grades of stainless, was outside welds.
 Now you may see some tack welds on the outside, but the actual
 welding is done on the backside.(inside)
 Also in current use is a tube within a tube.
 I noticed the weld bead was quite wide, increasing the haz,
 and may have contributed to the failure.

 >  Archie

Tube within a tube is a good idea and very easy to accomplish.   The
outer tube can be expanded to slip over the stub and heavily tacked
to the flange.  Remember to smooth and blend the weld bead that is on
the inside of the flange.   I think I will do that portion of my
exhaust system over now that I have a clear view of this.     Jerry

Tailwind & Rotary Engine Support

http://www.j-winddesigns.com

mailto:j-winddesigns@thegrid.net

 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2002 All world wide rights reserved.