Flexible exhaust tubing

RST Engineering wrote:

Clothes dryer ducting.

Jim



To model the exhaust pipes for a 985 or 1340?

Think about the hot-air connections on old VW (bug) defrosters off the
exhaust shroud.

Or maybe the flex-line that conducts hot air from exhaust manifold shroud to
the automatic choke on older (carbureted) auto engines?

Flash





"Stuart & Kathryn Fields" wrote in message
...
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

"RST Engineering" wrote in message
m...
Clothes dryer ducting.

Jim

That is 3 inch.
--
Jim in NC

Stuart & Kathryn Fields wrote:

hey stewie go down to the local electrical place and buy yourself 4
vacuum cleaners, or find a 'vacuums are us' and buy 4 replacement
flexible wands. they are plastic, are flexible and are the diameter
you need.

good luck on the chopper.

btw I have seen an RV6 that used 4 pipes into one with no muffler at
all. it was the quietest aeroplane engine I've ever heard. I dont know
what the trick was in the geometry but it used the same engine as you
are using. some amazing stuff is possible there.

Stealth Pilot

Interesting idea If the flexible wands hold their shape to a reasonable
degree we may have a solution.

Stu



Stiffen the hose with a piece of 14-3 house wiring running through the center. Or encapsulate the shaped tube in about
3 layers of cheap duct tape.

On Tue, 8 Jul 2008 18:21:43 -0700, "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


http://www.flexatube.com/flex.htm has it for $1.84/ft.

--Andy Asberry--
------Texas-----

"Stuart & Kathryn Fields" wrote in message
...
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


Stu,

Why can't you model your headers with equal lengths of 1/4" steel brake line
tubing? It's easy to bend without kinking, and could be bent around simple
plywood templets to maintain the minimum radii of the larger tube. Just
route it to represent the center line of the 1 1/2" tubing, and maintain at
least 1 1/2" between tubes.

"Maxwell" luv2^fly99@cox.^net wrote in message
...

"Stuart & Kathryn Fields" wrote in message
...
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


Stu,

Why can't you model your headers with equal lengths of 1/4" steel brake
line tubing? It's easy to bend without kinking, and could be bent around
simple plywood templets to maintain the minimum radii of the larger tube.
Just route it to represent the center line of the 1 1/2" tubing, and
maintain at least 1 1/2" between tubes.

A trick I found while trying conduit was that if I had all 4 pieces cut to
the same length and had them connected to the cylinders thru a flange, then
I could kind of bend them all at the same time keeping their other ends
together and have them all come to the collector at the same time. Doing
one cylinder at a time presents a bunch of trial and error, re-bend and try
again. I think that having the flex exhaust pipe might just save some time
and using up all of my cuss words. (I've only got about 15 minutes worth
before I start repeating myself) I found some galvanized flex exhaust on
Amazon.com

Stu