REFLECTOR: Suprise in my duct

Randy Wharton rwharton at buckeye-express.com
Mon Jun 20 11:44:30 CDT 2005


Why do you need a straw or something similar? Why won't the hole through the
fiberglass suffice?

Randy W.

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Juanita Londenberg
Sent: Monday, June 20, 2005 12:29 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Suprise in my duct

Scott:
That's what I did for a drain hole in the strake
"cubby hole" at your elbow when you open the door --
only I used a scrap piece of some kind of the aircraft
tubing that Brian had left over that's "never"
supposed to disintegrate.  -- We're not flying yet, so
it hasn't gotten any real work out.

Juanita

--- Scott Derrick <scott at tnstaafl.net> wrote:

> Today one of my projects as to open up the left hand
> duct so I could 
> prepare the oil line for my secondary oil
> cooler/cabin heater 
> installation. 
> 
> This under the back seat oil cooler will be
> connected so its gets the 
> oil first, the nose cooler is second in line, have
> two 100 CFM fans, 
> with an air diverter to provide recirculated cabin
> heat or dump the air 
> overboard for additional engine oil cooling in the
> summer.
> 
> I cut a 12 inch piece of the duct off and started to
> pull wires out of 
> the way and noticed some really weird looking stuff
> that completely 
> filled the cavitys between the oil lines, vacume
> line, throttle/mixture 
> cables, etc.  It looked like burnt wood chips or
> something? 
> 
> It turned out to be rust particles from the
> throttle/mixture cables. 
> water/moisture had entered the duct and sat in the
> low spot and attacked 
> the steel wraps on the cables.  The outer wrap was
> completely gone and 
> it was working on the inner wrap.  The cables
> operation showed no 
> symptoms of an impending failure. The rust area was
> about 18 inches 
> long. I ended up opening up more of the duct  so I
> could get all that 
> corrosion crap out of there.  The cables are of
> course junk.
> 
> I had heard of people talking about drain holes in
> the ducts and though 
> yeah, that would be nice....
> 
> It would be more than nice, it should be mandatory! 
> If you don't have 
> them you should make it a priority!
> 
> Any suggestions on how to make the drain holes? 
> I thought of drilling a 1/4"  hole, than flox in a
> thin straw through 
> the hole, then cut off the straw when cured?  Any
> better method?
> 
> Scott
> 
> 
> 
> 
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