Stuart & Kathryn Fields wrote:

I'm looking for a source of 1 1/2" flexible exhaust tubing. Mild steel is
acceptable. I want to use it for a model of the headers of a tuned exhaust
for my 0320 Lycoming engine that I have mounted in my Baby Belle helicopter.
The idea is to have 4 equal length pieces attached to exhaust flanges bolted
to the cylinders, arrange the 4 pieces to intercept the 4-into-1 collector,
coat the tubing with epoxy resin so that the shape is maintained and then
present these pieces to be copied by the exhaust bender.

Stu



I did one a long time ago using elbows and pieces.
(Couldn't spend money on it, so)

To "measure" the pipes, I filled the sample pipe with water
and measured the volumn of water for each pipe.

Lengthen the short ones, shorten the long ones.

It was a bit of a hassle, but it did work ok.

For what it's worth...

Richard