|
Hell Alec.
This is in response to your question on fabricating Kort nozzles.
I like to use fiberglass for parts outside the pressure hull.
Making a mold is simple, and fiberglass is easy to shape, smooth, and
finish. It is also quite strong and doesn't rust.
Metal can be bonded inside for added strength in key areas like mounting
points.
All the materials are readily available at most hardware stores or marine
supply shops.
If you run into something, it's very easy to repair also.
You can start with a chicken wire and paper mache' mold for the
inside, made smooth with plaster and then painted. Next, spray it with a thin
coating of wax so the fiberglass doesn't stick to it. You can also buy "mold
release" at the same store.
Build up layers of fiberglass and don't forget to sand the surface for the
application of new layers to insure you get a good bond.
After you've got the nozzle to it's required thickness and shape ( 4 to 6
layers should be plenty for a 15" round by 1'' thick ) just sand it smooth
making the final shape and put a gel-coat of your favorite color on.
With metal brackets imbedded in the piece, drill the holes and bolt it
up.
I'm making my ballast tanks and dive planes like this and it's real
easy.
Fiberglass is very forgiving too. If you get it too thick, just sand it
down to the desired shape.
The final gel-coat is basically a colored coat of fiberglass resin and is
very durable.
Some words of caution.......
Wear a dust mask when sanding, and old clothes and gloves when bonding.
Also, do this in a well ventilated area and don't smoke. It's flammable.
Sanding also puts lots of fiber in the air, and it gets into your skin and
itches like hell.
Wear a long sleeve shirt, or better yet, one of those paper suits ( Tyvek )
for sale at any hardware store. When you're done, take a COLD shower to wash off
any dust.
I've built lots of things with fiberglass, and it's an easy technique to
learn.
Good Luck......Frank Dalgleish
|