REFLECTOR: Suprise in my duct

Terry Miles terrence_miles at hotmail.com
Tue Jun 21 07:43:20 CDT 2005 

According to M Collier, as best I recall the conversation, in the early
days, Danny M was testing an engine w/ a turbo that had an oil leak
dripping on the turbo case.  It created huge amnts of smoke in the eng
compartment and the smoke was sucked backward thru the duct due pressure
variance twix duct v engine compartment.  That's at least part of why
people close off the the aft end.  

I know it's too late for most who read this today, but for posterity, at
Hangar 18's suggestion I have gouged out the foam on the fuselage floor
where the cannel goes, then re-enforced in that area, then laid in the
channel cover.  This gives us more channel ID by almost double. See
three pics.  I intend to drill a few drain holes with what's been
recently reported. (Thanks for sharing!!)  I also hope to create some
kind of a splash plate on the nose wheel assembly to minimize water
spray during tkof/landing phase.  Also I'll be doing the spring
actuation on the nose doors instead of hydro...thnks for that too.  It's
way simplier and saves 5 pounds to boot.

Regards,
Terry

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Scott Derrick
Sent: Monday, June 20, 2005 11:21 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Suprise in my duct


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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>  
>
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