KR> repairing bubbles

[Mark Langford]

I should also mention that I'd put in a "bleeder layer" of paper towels
directly above the bubble, then a layer of builder's plastic (to keep the
topsoil bag from sticking), and then weighted the topsoil bag with 70 pounds
of gasoline cans.  I really thought that would work, but only one of three
was anywhere near "close enough", and the other two have now been cut out
and patched, with excellent results.  It's amazing how quickly little
repairs like that go, when you're not talking about doing something as huge
as an entire wing or something.  Vacuum bagging would be the intelligent way
to do this, obviously.

A post mortem of the patches revealed no two part urethane foam, just a
fracture of the foam about an eighth of an inch deep, so the glass had a
good connection to the foam, but the foam itself broke.   The only cure I
can think of for that would be to use 4 pound Lastofoam instead of 2 pound
urethane, but that's a high price to pay when you're talking about the whole
airplane. I am using Lastofoam to build my baggage area behind the seats
though.

Mark Langford, Huntsville, Alabama
see KR2S project N56ML at http://home.hiwaay.net/~langford
email to N56ML "at" hiwaay.net

KR> repairing bubbles

[Joseph H. Horton]

Mark
I won't get to it today, just too hot. The only reason that I am going to
try it is the paint job. If it was unpainted it would be a no brainier.
The other thing that I did that we had talked about was you were saying
about your cowl lifting at the rear, I laid 2 more layers of uni cloth 1
1/2" wide along the back perimeter to stiffen it up/ and as it cured I
put a little reverse bow in between the screw holes so it had to sit
tight.
Joe 
On Mon, 3 Jul 2006 12:52:30 -0500 "Mark Langford" 
writes:
> I should also mention that I'd put in a "bleeder layer" of paper 
> towels
> directly above the bubble, then a layer of builder's plastic (to 
> keep the
> topsoil bag from sticking), and then weighted the topsoil bag with 
> 70 pounds
> of gasoline cans.  I really thought that would work, but only one of 
> three
> was anywhere near "close enough", and the other two have now been 
> cut out
> and patched, with excellent results.  It's amazing how quickly 
> little
> repairs like that go, when you're not talking about doing something 
> as huge
> as an entire wing or something.  Vacuum bagging would be the 
> intelligent way
> to do this, obviously.
> 
> A post mortem of the patches revealed no two part urethane foam, 
> just a
> fracture of the foam about an eighth of an inch deep, so the glass 
> had a
> good connection to the foam, but the foam itself broke.   The only 
> cure I
> can think of for that would be to use 4 pound Lastofoam instead of 2 
> pound
> urethane, but that's a high price to pay when you're talking about 
> the whole
> airplane. I am using Lastofoam to build my baggage area behind the 
> seats
> though.
> 
> Mark Langford, Huntsville, Alabama
> see KR2S project N56ML at http://home.hiwaay.net/~langford
> email to N56ML "at" hiwaay.net
> 
> 
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Joe Horton, Coopersburg, PA.
joe.kr2s.buil...@juno.com