Re: [PSUBS-MAILIST] Plywood and auto parts.

[MerlinSub@t-online.de (Carsten Standfuss)]

Michael B Holt schrieb:
> 
> On Mon, 06 Jan 2003 19:28:51 +0100 Carsten Standfuss writes:
> >
> >And plywood is not really pressuretight.. I use it to make the two
> >mold frames to blow a acrylic dome - and the pressure lost in the
> >longitudinal direction of the wood..
> 
> Was the plywood being used as a mold; that is, was the acrylic
> being formed against the plywood?

It was a rounded sheet of plywood, on top a plywood ring, than
on top a rounded sheet acrylic and finaly on top again a plywood ring.
All bolted and glued together in the ring areas. I heated the hole 
unit in a oven for two ours and than 
blow pressure air via a vale locate inside the first plywood ring. 
Its create the first form of a bubble - but the pressure was lost mostly
between the the inside plywood layers. 

  _        _      plywood ring
  ----------      acrylic sheet
  -        ===    plywood ring with air vale
  ----------      plywood plate

> >Why plywood ?
> 
> My project is a full-size working replica of Simon Lake's Argonaut
> Junior.   The original boat was made of two layers of pine planks.
> My version would be three layers of 12mm or 16 mm plywood
> under 12 mm of fiberglass.   This thing would not be put in water
> that would be much over my  head.   If the bottom is more than 10
> or 12 feet down, I'm not going in the water.
> 
> Mike H.

Mike .. -if- your replica should have any historic worth.. it should be
make close to the original as possible and as information are
available.. in this case from two layers of pine planks..
(and for the hardliners.. only with material and tools available 
at the time of the original). 

They build here a sailboat from year 1230 - with a compass and a diesel
motor.. From a research sientific-historian point you can not really
research history with this vessel.. 

best regards, Carsten