REFLECTOR: Water in the ducts....

[Jim Sower]

<... I am pretty confident the foam substrate is dry ...>
I wouldn't be.  Shop vac pulls maybe 10" on a good day.  Using a 
blanket, 4-mil plastic tarp and vacuum pump you'll get >20" over all the 
holes at once.  At much above 26" water can't exist at warm room temps 
and you will be sure you've drawn it all out.  For a pump, find any 
thrown away refrigerator at the local transfer station/landfill and pull 
the compressor out.  Connect the input end to your hose (wrapped with 
blanket material in a fold in the plastic) and let 'er rip

When bagging parts, I use a calibrated leak to maintain vacuum at <10" 
... Jim S.


Jeffrey Clough wrote:

> Thanx Jim...similar to what I did....I attached a bunch of hoses to a 
> bunch of holes and put playdoh (yep ...PlayDoh) to act as a putty to 
> hold them in place then placed the other end of the bunch o' hoses 
> into my shop vac and applied suction for a few hours....then moved on 
> to another set of holes...finally got to the point there was no longer 
> even VAPOR condensing in the hoses ( I had heat lamps shining on the 
> inside of the cabin and the air temp was in the 50's...Alaska evening 
> temps)...To be sure , I pushed q-tips into the most offending holes 
> and they came out dry and with no food coloring tracer...I am pretty 
> confident the foam substrate is dry...I let it sit for another week or 
> so and filled in all of the holes a couple of days ago....
>
> Jim Sower wrote:
>
>> What if you were to put some absorbent material, say, a towel over 
>> all those 100 holes, tape a piece of 4-mil plastic over that and 
>> vacuum bag that area?  Would be simple enough and would get a whole 
>> lot more moisture out than a heat lamp.  I can give you some details 
>> on cheap, easy vacuum bagging suitable for this purpose.
>> This is certainly a cause for some concern ... Jim S.
>>
>> Jeffrey Clough wrote:
>>
>>> OK...I have read all the posts about water in the ducts.....There is 
>>> a BIG question I have: Perhaps y'all read my posts about filling my 
>>> tanks with green water and finding leaks all through my floor 
>>> boards.......if water collects in your ducts it could /*as easily 
>>> */collect in the foam of *YOUR* floor.......WHAT happens when it 
>>> FREEZES?   Delamination? I would expect so.....
>>>  I put heat lamps on my floor boards for a WEEK and tonight drilled 
>>> test holes and found WATER.(I finally found the source of my leak 
>>> was a vent line I had to put in to the right tank as a retrofit for 
>>> the newer sump tank and vent system...).....I finally drilled a 
>>> HUNDRED holes through the fuselage to let water out and it WAS 
>>> coming out...of a LOT of the holes...now I plan on letting the 
>>> lights shine for some time before sealing all of the holes AND 
>>> putting holes in the ducts where I can....I think it would be a 
>>> GREAT idea to paint the area under your ducts (before assembly) AND 
>>> put drains in SEVERAL spots BEFORE glassing the ducts in!!!!  Does 
>>> this make anyone else sweat a little?     J Clough      173 RG 
>>> clamshell
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