Re: Slightly warped PVC foam


JMasal@...
 

If 110 is the one way back in the tail you'd need a midget to install it. I may not have it in my Q-1. I remembe calling QAC about
that last bulkhead and they didn't seem to get hot and bothered whether it was in or out. Best you might do is butter the edges with
flox and carefully seat it as best you can.


j.

-----Original Message-----
From: Sam Hoskins <sam.hoskins@...>
To: Quickie List <Q-LIST@...>
Sent: Thu, Aug 22, 2013 8:29 am
Subject: Re: [Q-LIST] Slightly warped PVC foam


Chris, welcome.

This is one of the kind of questions that new builders have that turns out
to be no problem. Warped foam is no big deal. Here is why.

When you are building a composite sandwich, the part doesn't become rigid
until the whole sandwich is complete. Take, for instance, your piece of
warped bulkhead foam. You lay it on the flat table and it's all
cattywhumpuss. You fret, worry and consider ordering new foam, but it's
not a big deal.

Now, you decide to glass one side with a single layer of BID. After it
cures, you may still have a warp and it will seem very loose and floppy.
Again, no big deal.

The key to a straight piece comes in when you glass the opposite side of
the sandwich. This is when you should make the big effort to make sure it
is laying flat while it cures. Naturally, your table must be flat. Before
the time the second layer cures, you may see that the piece isn't perfectly
flat, because of previous warpage in the first steps. Again, no big deal.
Simple weigh down the part with enough weight to hold it flat while
curing. You could also use pins/small nails to hold the edges down, but
using small weights is the easiest. You can apply saran wrap on the wet
epoxy to keep the weights from sticking, or you could use peel ply dacron.

Let it fully cure before removing the weights. As long as the second side
of the sandwich is nice and flat during cure, you will have a good part.

Clear as mud? Let us know how it turns out.

Sorry, can't answer the FS110 bulkhead question, as I built the two place
model and don't have the single place plans.

Sam


On Wed, Aug 21, 2013 at 1:28 PM, n7188u <n7188u@...> wrote:

**


Hi,

I am starting construction of my Q1 bulkheads and have a couple of
questions:

1.- On examination of the materials I have, I discovered that my 3/8" PVC
is slightly warped (not flat). I know that once I laminate it it will be
stiff so I will hold it down flat in my workbench with a couple dabs of 5
min epoxy but wondered if there is a trick for flatten it a bit. Maybe
slight application of heat and placing a flat weight on top of it?.

2.- I noticed that the plans call to not glass FS110. As much as I looked
I cant find where in the plans this eventually gets glassed. Well, I have
to admit just perusing the plans after the bulkhead construction section
but I can't seem to find that info and I am curious.

Thanks,
Chris







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