Today's Message Index:
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1. 11:33 AM - Cut Exhaust Stacks (RV7ASask)
2. 01:53 PM - Re: Cut Exhaust Stacks (Max Hegler)
3. 03:06 PM - Re: Cut Exhaust Stacks (John Myers)
4. 06:44 PM - Re: Cut Exhaust Stacks (rvaitor@comcast.net)
Message 1
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| Subject: | Cut Exhaust Stacks |
I marked my Vetterman Exhaust to cut the pipes off parallel to the bottom of the
aircraft. That would mean the hole is parallel to the airflow and the pipes
would come to a bit of a point. My local mechanic suggested I should leave them
as delivered, the hole 90 degrees to the pipe and the airflow. He said there
was better thrust/power/drag.
Looking at Larry Vetterman's Skunkworks http://www.vettermanexhaust.com/ he has cut the pipes as I proposed in a couple of his iterations. The one advantage I can immediately see is there is less pipe hanging out to drag plus it looks better.
Can anyone come up with a good reason one way or the other to cut or not to cut?
Thanks
David Lamb
RV7A
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=311556#311556
Message 2
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| Subject: | Cut Exhaust Stacks |
Maybe a little more thrust with the pipes cut off at 90 degrees. Other than
that=2C I would suggest contacting Vetterman and see if they have any pro'
s and con's either way.
Max RV-7 (#2)
> Subject: RV7-List: Cut Exhaust Stacks
> From: rv7alamb@sasktel.net
> Date: Mon=2C 6 Sep 2010 11:32:16 -0700
> To: rv7-list@matronics.com
>
>
> I marked my Vetterman Exhaust to cut the pipes off parallel to the bottom
of the aircraft. That would mean the hole is parallel to the airflow and t
he pipes would come to a bit of a point. My local mechanic suggested I shou
ld leave them as delivered=2C the hole 90 degrees to the pipe and the airfl
ow. He said there was better thrust/power/drag.
>
> Looking at Larry Vetterman's Skunkworks http://www.vettermanexhaust.com/
he has cut the pipes as I proposed in a couple of his iterations. The one
advantage I can immediately see is there is less pipe hanging out to drag p
lus it looks better.
>
> Can anyone come up with a good reason one way or the other to cut or not
to cut?
>
> Thanks
>
> David Lamb
> RV7A
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=311556#311556
>
>
>
>
>
>
>
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Message 3
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| Subject: | Re: Cut Exhaust Stacks |
Message 4
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| Subject: | Re: Cut Exhaust Stacks |
----- Original Message -----
From: "John Myers" <jmyers@FLYINGMRANCH.US>
Sent: Monday, September 6, 2010 4:53:41 PM
Subject: Re: RV7-List: Cut Exhaust Stacks
In my opinion, you probably get the most positive results from
slanting the existing length pipes at between 25 and 30 degrees down. Le ss
and you get exhaust pulses "thumping" on the bottom of the fuselage, more
than that and you get more drag. 25-30 degrees should give you a miniscu le amount
of positive thrust.
I seem to get a little vibration on the floorboards and have exhaust extensions
that tilt down. When I lift my feet off the floor I can feel the vibration. Any
ideas or suggestions would be appreciated.
Shelby Smith
RV7
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