Re: [PSUBS-MAILIST] Thruster ideas

["Joseph Perkel" <joeperkel@hotmail.com>]

James,

This is way ahead of the planned learning curve for me but, if your going to 
hit the grindstone on thrusters, here are some of the questions stirring in 
my mind.

---When are magnetic couplers no longer appropriate (what torque level)?

---How much heat energy needs to be taken away from what amount of power 
generation at what rate?

---What is appropriate to fill with oil and, what is not? (can you fill an 
AC motor with oil?).

I wouldn't worry so much about the prop direction issue, your solution seems 
correct and, working field examples show it to be not too much of a worry.

Joe


> From: "Lil Brother LLC" <lil_brother_llc@bellsouth.net>
> Reply-To: personal_submersibles@psubs.org
> To: <personal_submersibles@psubs.org>
> Subject: Re: [PSUBS-MAILIST] Thruster ideas
> Date: Sat, 28 Jul 2007 01:08:52 -0500
>
> Well,
>
> It didn't take long....and I've run into a snag.
>
> Here is the problem....and I would like opinions of the best choice....and
> it is a choice.
>
> Props are optimized to thrust in one direction. Which direction would be 
> the
> best for thrusters?
>
> I figure forward for a horizontal thruster.....what about a vertical one?
>
> My thinking is ofcourse thrusting (pushing water) down.....giving you an
> upward movement.
>
> This discussion is for fixed thrusters not movable ones. Movable would be
> optimum, but life doesn't always work that way.
>
> If anyone disagrees please let your ideas be known,
>
> James Long
> Owner/Designer
> Lil Brother LLC (Instrument Division)
> ----- Original Message -----
> From: "Lil Brother LLC" <lil_brother_llc@bellsouth.net>
> To: <personal_submersibles@psubs.org>
> Sent: Friday, July 27, 2007 5:10 PM
> Subject: [PSUBS-MAILIST] Thruster ideas
>
>
> I'm working on some ideas....and would like to know how many people would 
> be
> interested in the design.
>
> The thrusters will probably start off small, but they should be the
> following (pending research):
>
> 1. Approximately the thrust of the ones used on the K-350.
>
> 2. Magnetically coupled shaft (reduced shaft pressure)
>
> 3. Oil filled. (Greater depth capacity) I know some oils that I believe can
> be used that are not environmentally hazardous.
>
> 4. Phased type motors, so the controls will be more complex.
>
> Let me know your thoughts,
>
> James Long
> Owner/Designer
> Lil Brother LLC (Instrument Division)
>
>
>
>
>
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