REFLECTOR: Repairs

[Dave T Nelson]

Many EZ types have the exhaust end inside the cowl.  I've been doing that
for many years now on my Velocity.  It actually works quite well and can
increase overall cooling.  The exhaust gas is at such a greater velocity
than the air around it that  it actually acts as an augmentation and
"pulls" air out of the cowling.

Because your exhaust exits through the bottom of the cowl directly down
tangentially into the slipstream instead of exiting aft in parallel with
the slipstream, you probably are getting some of that hot exhaust gas back
into the cowl.

One other factor to consider is the large drag you are creating exiting
your exhaust down instead of aft.  It's a very "draggy" setup... I probably
gained close to ten knots when I got rid of it.

Dave

----- Message from Scott Derrick <scott at tnstaafl.net> on Fri, 21 Sep 2012
07:18:20 -0600 -----
                                                           
      To: Velocity Aircraft Owners and Builders list       
          <reflector at tvbf.org>                             
                                                           
 Subject: Re: REFLECTOR: Repairs                           
                                                           


Wow, I've never heard of ending he exhaust "inside" the cowl! That sounds
bad,  I definitely want my exhaust outside my engine compartment and away
form the plane!

here's a picture of my left stack.

Scott


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-------- Original Message --------
Subject: REFLECTOR: Repairs
From: Lou Stedman <stedmanlou at roadrunner.com>
To: Velocity Reflector <reflector at tvbf.org>
Date: 09/20/2012 11:08 PM
      I have two repairs to do to my bird.

      First, while I was on a trip this week, I was forced to tie my plane
      outside. There was a large storm with high winds that came through
      and blew my right rudder so that the bell crank  is now loose. What
      is the best way to repair this?

      Second, I am getting severe bubbling on my lower cowl, around the
      exhaust tube. I am running a straight pipe out both right and left
      side. The end of my pipe is about 1” inside the cowl. There is a
      metal heat shield applied to the cowl with high temp silicone. Do
      your pipes extend out of the cowl and how much clearance around the
      pipes do you have? If you have any pictures I would love to see them.

      Thanks for any advice you may have.

      Lou Stedman
      Velocity SEFG
      N7044Q
      Olean, NY


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