VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #11  
Old 12-01-2019, 10:52 AM
bruceh's Avatar
bruceh bruceh is offline
 
Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,247
Default

Quote:
Originally Posted by pitts flyer View Post
I have 3 unused new ones. If you pay the postage via paypal and a bit extra for the paypal fee, I will send them to you.
Dave
Sent you a PM.

Thanks!
__________________
Bruce Hill
RV-9A N5771H flown over 700 hours!
http://www.overthehills.com/RV-9A-Project
APRS Tracking for KJ6YRP and New Flying Blog
2019 VAF donator
EAA Tech Counselor
Reply With Quote
  #12  
Old 12-01-2019, 11:06 AM
bruceh's Avatar
bruceh bruceh is offline
 
Join Date: Mar 2008
Location: Ramona, CA
Posts: 2,247
Default

Quote:
Originally Posted by Steve Melton View Post
I'm there at 800 hrs. Why did it fail? Was it connected to the engine or the somewhere else?
It is installed according to plans up to the tabs on the oil sump, but the plans also state not to bend the end of the tubing tabs. There is really no way not to bend them if you want them to fit around the engine mount.

The broken one is the one in the middle of the photo here:

You can see that without a slight bend on the tab, it won't line up with the other tube coming down from the sump.

The broken one is the lower one on the far side in this photo.


I'm not shocked that it broke, since I know of many other cases from reading these forums about this issue with bending the tabs and then allowing them to crack. 750 hours isn't bad! Just a reminder to others to always check them. In my preflight, I didn't notice any extra looseness in the exhaust pipes with a wiggle test.

Keith's suggestion is intriguing, to use auto exhaust hanger material between steel straps. Got any photos?
__________________
Bruce Hill
RV-9A N5771H flown over 700 hours!
http://www.overthehills.com/RV-9A-Project
APRS Tracking for KJ6YRP and New Flying Blog
2019 VAF donator
EAA Tech Counselor
Reply With Quote
  #13  
Old 12-01-2019, 11:26 AM
Steve Melton's Avatar
Steve Melton Steve Melton is offline
 
Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,253
Default

your arrangement is good. the design for a flattened tube is poor but it's light weight and fits a rubber tube so it's worth trying to improve. what about a set of dies that transition from round to flat smoother. I don't know if it's worth much but I'll give it a try. if it works I may also be able to put a bend in there. there has to be an optimal design for this transition. I'll poke around.

__________________
Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 700+ for all

Simplicity is the art in design.

www.rvplasticparts.com

Last edited by Steve Melton : 12-01-2019 at 11:39 AM.
Reply With Quote
  #14  
Old 12-01-2019, 01:07 PM
Jonathan Alvord Jonathan Alvord is offline
 
Join Date: Feb 2018
Location: Prosser, WA
Posts: 70
Default

Mine Recently broke as well. Was a simple fix however I suspect it was due to the fact that I had not been lubricating the exhaust joints, which I was not aware of. I am now. This was an easy fix. Clamped the ends and then drilled a hole and reattached.

Jon

Quote:
Originally Posted by bruceh View Post
I was doing an oil change today, and as usual, I give the entire engine a really good look over. I found one of the exhaust hangers had cracked.



The hanger is made from thinwall stainless steel 3/8" tubing. I know I can source this stuff locally, but making the end flattened looks like it might require some special skills/tools. I don't want to just beat it flat with a hammer. My vise is probably not sufficient to pinch this, and I don't have a hydraulic press.

Any tips, or should I just call Vetterman Exhaust and get a replacement?

Would you replace all hangers, or just the one that is cracked?
__________________
N122EF RV7A
S40 Prosser Washington
=VAF Dues paid 2019=
Reply With Quote
  #15  
Old 12-01-2019, 01:19 PM
Steve Melton's Avatar
Steve Melton Steve Melton is offline
 
Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 2,253
Default

yeah, we want to get away from this stuff. there could be a market for a fitting welded to a tube to take the place of these smashed tubes. perhaps anti-splat could pick this up.
__________________
Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 700+ for all

Simplicity is the art in design.

www.rvplasticparts.com
Reply With Quote
  #16  
Old 12-01-2019, 02:08 PM
Sam Buchanan's Avatar
Sam Buchanan Sam Buchanan is offline
been here awhile
 
Join Date: Dec 2004
Location: North Alabama
Posts: 4,014
Default

Quote:
Originally Posted by Steve Melton View Post
yeah, we want to get away from this stuff. there could be a market for a fitting welded to a tube to take the place of these smashed tubes. perhaps anti-splat could pick this up.
3/8" solid steel rod can be used instead of the flattened tubing, that's what I use for the hanger that goes between the tailpipes.
__________________
Sam Buchanan
1999 RV-6
1918 Fokker D.VII replica
Reply With Quote
  #17  
Old 12-02-2019, 06:30 AM
fixnflyguy fixnflyguy is offline
 
Join Date: Jan 2006
Location: Winston-Salem, N.C.
Posts: 1,047
Default What I did..

I used 3/8 Stainless tubing which I threaded the inside of the ends and put in Heim bearings similar to the hinges on the flight controls. I then cross drilled a rivet through the shank to prevent any back out of the Heim bearing. A Stainless tab is installed on the sump and the exhaust hanger at the tip bent to the correct angle, then bolt the tube/rod end assembly in. It allows movement, but has no flattened ends to fail. If you are flattening a tube, the best crack prevention is a small piece of steel (1/16"-1/8" thick)looking like a popsicle stick inserted in the tube an inch or so then squeeze the tube over it. This prevents the sharp radius failure point of the flattened tube.
__________________
Bill E.
RV-4/N76WE
8A7 / Advance NC
Reply With Quote
  #18  
Old 12-02-2019, 07:02 AM
turbo's Avatar
turbo turbo is offline
 
Join Date: Jan 2007
Location: Stuart, FL /Hartford, CT/Virgin Gorda,BVI
Posts: 3,084
Default

Quote:
Originally Posted by Sam Buchanan View Post
3/8" solid steel rod can be used instead of the flattened tubing, that's what I use for the hanger that goes between the tailpipes.
ditto on this method. replaced all my hollow tube supports with solid ones. flattening the end took some work but worth the effort. will never break.
[IMG][/IMG]
__________________
TURBO YES =VAF= Payed Jan2019
Ed D'Arcy
RV6-A 5,100+ hrs, R-44 1,600 hrs, Helicycle 320 hrs, gyro sold,35,000 miles flown in 2015
Stuart, Fl / S WINDSOR,Ct / Virgin Gorda, BVI - under major repair from hurricane damage
VAF #840 EAA AOPA FAC FABA QB SPA
RV HOTEL LOCATION oct thru may.
addicted pickle ball player
https://i.postimg.cc/tn3h4svg/IMG-3101.jpg
Reply With Quote
  #19  
Old 12-02-2019, 07:47 AM
DanH's Avatar
DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 8,880
Default



__________________
Dan Horton
RV-8 SS
Barrett IO-390
Reply With Quote
  #20  
Old 12-02-2019, 02:47 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is online now
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,182
Default

Quote:
Originally Posted by Sam Buchanan View Post
3/8" solid steel rod can be used instead of the flattened tubing, that's what I use for the hanger that goes between the tailpipes.
Or, 3/8 solid aluminum rod. This ended the problem of breakage on the first RV.

Carl
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 06:08 PM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.