Re: [PSUBS-MAILIST] Water nozzle propulsion

[John Gaertner <jgaertner1@earthlink.net>]

Bill:

Right now my plan is to locate my 24V DC motor within its own sound proof housing, in the main hull. If this proves too noisy, then it would be possible to move its location to the main battery compartment, isolating it from any potential hydrogen gas source, for sure.

Your suggestion of casting the nozzles is a good one. My hand formed ones are only for testing their operational performance. I have experience in casting both bronze and brass and access to the necessary foundry equipment to do so in the future. That is a good suggestion. 

Regards,

John Gaertner 


-----Original Message-----
>From: Akins <lakins1@tampabay.rr.com>
>Sent: Apr 11, 2006 9:35 AM
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] Water nozzle propulsion
>
>Hi John.
>
>Is your electric motor brushless or sparkless? Take care if you install it in your battery compartment without first isolating it from the batteries. Risk of hydrogen explosion.
>Just an idea, but after you form the nozzles from wood, have you considered using that to make a mold and pour the nozzles out of brass? Brass would be more corrosion
>resistant than aluminum or mild steel. You could go to a local foundry or even make the mold yourself.. You could also use wax to form the nozzles
>and then pour the mold material over the wax, and then when the mold material had hardened and you drill a hole to pour your brass into the mold, the wax will evaporate and
>the brass will fill the void where the wax was. Called the lost wax process for molding an object. Unfortunately the mold is only good for one usage because you destroy it when
>you break it apart to get to the molded piece.  I am interested in these underwater water pumps for sub propulsion, but I know nothing about them. Is it something like the propulsion
>used for a jetski but with an electric motor instead of a gas motor? Or is it more like an enlarged bilge pump in operation? Or is it more like a submersible in pipe well pump?
>I only know about electric motors and propellers like on my wetsub. The water pump idea intrigues me because I like the idea of someone being able to install the electric part inside their sub
>and the rest outside and therefore not need any pressure compensation like you would on an electric motor with a prop. It would be great to see some video of this in action underwater.
>Bill Akins.
>




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