Re: [PSUBS-MAILIST] Kort nozzles

[MerlinSub@t-online.de]

Hi Alec, make a Stainless steel or aluminium conus ring from a sheet metal with one weld. 
This will be the outside. Than make the profil inside with epoxifiller - easy with a wodden negativ-template. 

Best regards Carsten 

<ShellyDalg@aol.com> schrieb:
> 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
> 





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