REFLECTOR: Suprise in my duct

Juanita Londenberg i.fly.too at sbcglobal.net
Mon Jun 20 12:43:18 CDT 2005


I don't know what your fuselage is made out of, but
our's has a layer of foam in between the layers of
fiberglass.  I'm thinking water (or other liquid)
could soak into the foam and eventually separate from
the fiberglass??????????

j

--- Randy Wharton <rwharton at buckeye-express.com>
wrote:

> 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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