Exhaust hanger replacements / hanger designs

[gereed75]

I made a hangar system along the lines of the older “stock” system as shown in the photos linked above but but with the following mods -

I used the squashed stainless tube hangers as used by Vetterman, but substituted stainless steel springs for the rubber hose. The spring ID fits snugly to the tubes. One end of the spring is silver soldered to the tube. On the other end, the tube was drilled and a roll pin was installed perpendicular to the tube. The roll pin allows you to slide the tube into the spring up to the roll pin, then the roll pin engages the space between the spring coils so that by winding the tube into the spring, the length of the assembly can be adjusted.

The second part of the design is a spreader bar made from a stainless length of all thread about 10” long. I think it is 6-32 thread. It slides into an 8” length of aluminum tubing with 1” of all thread sticking out of each end. The aluminum tube is held in position by a pin through the aluminum tube and all thread. The threaded ends of the spreader bar assembly goes through the holes in the “stock” exhaust clamps and hold the exhaust pipes 8” apart.

The stainless tube spring assemblies are placed on the threaded ends of the spreader bar with the other ends bolted at the sump bolts, again just like the “stock” tube and hose arms.

The advantages are numerous - all stainless construction, no rubber hoses that slide on the tubes allowing the exhaust end to move, no bulky hose clamps in the cowling outlet airstream, full adjustability in exhaust position, the spring arms allow but control exhaust pipe motion, etc. etc.

This setup has been completely reliable in 500 hours. The SS springs came out of McMaster Carr. Neat, tidy, decent looking, works.

Traveling so No pictures. Might find some or take some if anyone interested.

[vic syracuse]

I agree with Walt. I?ve used the rubber hose hangars on all of my airplanes. I do use the heavie MIL 6000 hose, as it seems to stay clamped to the he tubes much better. Yes, once in a while th adel clamps need replacing.

Larry Vetterman, who has forgotten more about exhaust systems than I will ever know, tells me the setup shown with the clamps directly attached to the hangar mounts is OK.

Vic

[Ralph Inkster]

Funny how some planes I see never have a problem with the stock hose with hose clamp hangar arrangement. For those that come in with slipped apart tail pipe hangars I flatten the stainless tube & drill it, & the hose, for an AN3 bolt/AN970 washer/metal lock nuts. No more slippage problem.

[1bigdog]

Originally Posted by gereed75

I made a hangar system along the lines of the older ?stock? system as shown in the photos linked above but but with the following mods -

I used the squashed stainless tube hangers as used by Vetterman, but substituted stainless steel springs for the rubber hose. The spring ID fits snugly to the tubes. One end of the spring is silver soldered to the tube. On the other end, the tube was drilled and a roll pin was installed perpendicular to the tube. The roll pin allows you to slide the tube into the spring up to the roll pin, then the roll pin engages the space between the spring coils so that by winding the tube into the spring, the length of the assembly can be adjusted.

The second part of the design is a spreader bar made from a stainless length of all thread about 10? long. I think it is 6-32 thread. It slides into an 8? length of aluminum tubing with 1? of all thread sticking out of each end. The aluminum tube is held in position by a pin through the aluminum tube and all thread. The threaded ends of the spreader bar assembly goes through the holes in the ?stock? exhaust clamps and hold the exhaust pipes 8? apart.

The stainless tube spring assemblies are placed on the threaded ends of the spreader bar with the other ends bolted at the sump bolts, again just like the ?stock? tube and hose arms.

The advantages are numerous - all stainless construction, no rubber hoses that slide on the tubes allowing the exhaust end to move, no bulky hose clamps in the cowling outlet airstream, full adjustability in exhaust position, the spring arms allow but control exhaust pipe motion, etc. etc.

This setup has been completely reliable in 500 hours. The SS springs came out of McMaster Carr. Neat, tidy, decent looking, works.

Traveling so No pictures. Might find some or take some if anyone interested.

Hi Gary

I just got to this point so pictures of this interesting bit of engineering you've done would help.

Thanks.

[rightrudder]

Stock hanger system on mine, but before assembly I made a bunch of perpendicular cuts to the tubing with a Dremel cut-off wheel, to give give the hose something to bite into. No slippage issues.

[Onewinglo]

The aviation isle at Auto Zone has a solution that worked for us...
The subject of the image is the carb but you can see the rubber exhaust hangers in the background.
https://photos.app.goo.gl/zr33ydHECxqdhVyq9

[1bigdog]

Originally Posted by Onewinglo

The aviation isle at Auto Zone has a solution that worked for us...
The subject of the image is the carb but you can see the rubber exhaust hangers in the background.
https://photos.app.goo.gl/zr33ydHECxqdhVyq9

That helpful. It's the old style SAAB hangar. I might even have one in the garage from my old Talladaga:
https://www.eeuroparts.com/Parts/131...Rear-4235404G/

We don't have autozone in Canada but Canadian Tire might have an aviation section.

Thanks for the lead.