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Exhaust Stacks

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Jerry Cochran

Joined: 10 Jan 2006
Posts: 111
Location: Wilsonville, OR

Posted: Sun Apr 08, 2007 10:26 am Post subject: Exhaust Stacks

Anyone here have opinion/facts on effect of exhaust stack length  on power and/or aerodynamics of stacks hanging out in the airstream? I have  standard Vetterman stacks and as they come extend from the bottom of cowling  about 9". Anyone shorten them up with positive results? Just noodling as  usual..

  

 Jerry Cochran

 RV-6a Phase One





See what's free at AOL.com. 

  [quote][b]

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Gary.A.Sobek

Joined: 09 Jan 2006
Posts: 217
Location: SoCAL USA

Posted: Sun Apr 08, 2007 11:11 am Post subject: Exhaust Stacks

Jerry:



I shorten mine 10 years ago. It makes more noise in the cockpit and more 

vibration on the floor.  After about a year of that, I installed 22 degree 

turn downs (purchased from Vetterman) to get the exhaust away from the 

airplane.  Less floor vibration and appears to be less noise.



I did not see any speed difference.  I will let others that have done more 

flight testing with and without make claims to speed increases.

Gary A. Sobek

"My Sanity" RV-6 N157GS O-320 Hartzell,

1,988 + Flying Hours So. CA, USA





----Original Message Follows----

From: Jerry2DT(at)aol.com

Reply-To: rv-list(at)matronics.com

To: rv-list(at)matronics.com

Subject: Exhaust Stacks

Date: Sun, 8 Apr 2007 14:25:26 EDT

Anyone here have opinion/facts on effect of exhaust stack length  on power

and/or aerodynamics of stacks hanging out in the airstream? I have  standard

Vetterman stacks and as they come extend from the bottom of cowling  about 

9".

Anyone shorten them up with positive results? Just noodling as  usual..



Jerry Cochran

RV-6a Phase One





************************************** See what's free at 

http://www.aol.com.



_________________________________________________________________

Exercise your brain! Try Flexicon. 

http://games.msn.com/en/flexicon/default.htm?icid=flexicon_hmemailtaglineapril07

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martin(at)gbonline.com
Guest

Posted: Sun Apr 08, 2007 3:14 pm Post subject: Exhaust Stacks

Jerry,

 I have tested both the longer stacks from Larry and the earlier versions  that were approx 4 -6 inches longer.  The longer stacks will give you a 1  to 2knot speed gain, however, they will also slightly increase the noise level  within the fuselage. The stacks with a down facing elbow are quieter and also  slower than both of the above.  These tests were done in my RV8. I do not  know if the above will apply to the RV6 &  RV7, however, I would think  that the same results would apply also.

  

 Dick Martin

 RV8 N233M

 the fast one

 [quote]   ---

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Jerry Cochran

Joined: 10 Jan 2006
Posts: 111
Location: Wilsonville, OR

Posted: Mon Apr 09, 2007 8:37 am Post subject: Exhaust Stacks

Thanks guys,

  

 Exactly the kind of info I was looking for. Guess I'll leave mine  alone...

  

 Jerry Cochran

  	  Quote: 	
		  From:    "Richard  Martin" <martin(at)gbonline.com>

Subject: Re: RV-List:    Exhaust Stacks



Jerry,

I have tested both the longer stacks from    Larry and the earlier versions 

that were approx 4 -6 inches longer.     The longer stacks will give you a 

1 to 2knot speed gain, however, they    will also slightly increase the 

noise level within the fuselage. The    stacks with a down facing elbow are 

quieter and also slower than both of    the above.  These tests were done 

in my RV8. I do not know if the    above will apply to the RV6 &  RV7, 

however, I would think that    the same results would apply also.

	


 

  



See what's free at AOL.com. 

  [quote][b]

- The Matronics RV-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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