REFLECTOR: Suprise in my duct

[Scott Derrick]

Fred,

I can only assume you missed the original post I made as to why 
something is needed.

Believe it or not,  do something or not. 

Scott

Fred Marconi wrote:

>Velocity airplanes have been flying for many years and to date this has not
>been a concern.  The only place where we are advised to drill holes is in
>the bottom of the winglets.
>
>Fred
>
>----- Original Message -----
>From: "Chuck Jensen" <cjensen at dts9000.com>
>To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
>Sent: Monday, June 20, 2005 2:09 PM
>Subject: RE: REFLECTOR: Suprise in my duct
>
>
>Micro-ing a straw or some other permanent drain hole in place is probably a
>good-practice, but I believe the foam is closed cell so it shouldn't
>absorb/wick water.  Others may know better?
>
>Chuck
>
>-----Original Message-----
>From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
>Behalf Of Juanita Londenberg
>Sent: Monday, June 20, 2005 1:43 PM
>To: Velocity Aircraft Owners and Builders list
>Subject: RE: REFLECTOR: Suprise in my duct
>
>
>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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>>    
>>
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>>
>
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>  
>