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  #1  
Old 10-04-2017, 04:18 PM
Tom Martin Tom Martin is offline
 
Join Date: Jan 2005
Location: Ontario, Canada
Posts: 1,288
Default RV14 Exhaust hanger

I am noticing a bit of vibration in the tunnel and side skins of the RV14. The aircraft is also a bit louder in the cockpit then I am used to.
When I installed the aft exhaust pipe hanger I wondered why such a solid metal arrangement had been used.
In the following picture you can see the stock hanger on the right side and the "rubber" isolator that I fabricated on the left. I made the hanger from automotive exhaust pipe hanger material. Both sides now have the modified hangars and I will test fly it tomorrow. I have never seen, on any equipment, such a rigid exhaust pipe hanger as was supplied by Vans' for the RV14. The new set up securely holds the pipe and I can not help but think it will help with both vibration and sound. I will report back

Finally something on the RV14 that looks like it was made by a homebuilder;-)


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Tom Martin RV1 pilot 4.6hours!
CPL & IFR rated
EVO F1 Rocket 1000 hours,
2010 SARL Rocket 100 race, average speed of 238.6 knots/274.6mph
RV4, RV7, RV10, two HRIIs and five F1 Rockets
RV14 Tail dragger under construction #153

Fairlea Field
St.Thomas, Ontario Canada, CYQS
fairleafield@gmail.com
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  #2  
Old 10-04-2017, 07:13 PM
VA Maule VA Maule is offline
 
Join Date: Apr 2016
Location: Bucking ham, Virginia
Posts: 40
Default

Really good looking riveting. On the rubber hanger strap I would use one on each side exhaust systems don't like to be rigid.
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  #3  
Old 10-04-2017, 09:02 PM
pilotkms pilotkms is offline
 
Join Date: Mar 2007
Location: ALTA LOMA, CA
Posts: 116
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I think u will be happy. I used the same rubber material for my RV7A rather than the slippery tube and hose fittings per plans. More solid retention but the same or better flex. Has worked fine for my first 30 hours of phase 1.
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  #4  
Old 10-04-2017, 09:42 PM
kgood kgood is offline
 
Join Date: Mar 2009
Location: Boulder City, NV
Posts: 149
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I did the same thing with the exhaust on my Diesel Sportsman. The rubber ended up getting brittle and melting. So i cut 3/4" x 2" strips from a silicone turbo hose, and they have worked flawlessly for over 400 hours. They have remained soft and flexible; still look like the day i installed them.

FWIW....

Kurt Goodfellow
RV9 / WAM diesel 570 hours
Sportsman / CD155 Diesel 440 hours
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  #5  
Old 10-05-2017, 05:46 AM
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DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 7,117
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The cable loop hangers in this photo have been bulletproof, 700 hrs so far. Credit where due; they came with the pipes.

https://awi-ami.com/

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  #6  
Old 10-05-2017, 07:01 AM
Tom Martin Tom Martin is offline
 
Join Date: Jan 2005
Location: Ontario, Canada
Posts: 1,288
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1st flight with new isolators on exhaust got rid of almost all tunnel vibrations. Sound is subjective but seemed a lot quieter at all rpms.
So far I am impressed with the difference. The stock isolators are not at all similar to Dan's cable mounts. I can see how his to work as they allow the pipe to move. More flight tests yet today but it this looks like a step in the right direction.
__________________
Tom Martin RV1 pilot 4.6hours!
CPL & IFR rated
EVO F1 Rocket 1000 hours,
2010 SARL Rocket 100 race, average speed of 238.6 knots/274.6mph
RV4, RV7, RV10, two HRIIs and five F1 Rockets
RV14 Tail dragger under construction #153

Fairlea Field
St.Thomas, Ontario Canada, CYQS
fairleafield@gmail.com

Last edited by Tom Martin : 10-05-2017 at 02:03 PM.
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