Re: [PSUBS-MAILIST] Pressure air drive.

[Coalbunny <coalbunny@vcn.com>]

And the waste N would have to be disposed of.  Disposing it into water
outside the hull may be considered a haz-mat issue.
Carl


jbarlow@bjservices.ca wrote:
> 
>       I think that those may be vane type motors.  I believe that one would
> want to use piston type to get maximum expansion (stored energy) out of the
> compressed air.  I think that it would be a simple cheap way to store
> power, but the energy density would be far lower than with batteries.  Also
> with the .6 hp at 25000 rpm you need a gearbox to make that into usable
> power, and to get 25:1 reduction (approximate) you need a gearbox with many
> stages and the resulting efficiency loss at each step.  Piston type air
> motors would run in the rpm range that be more usable, but to get the .6 hp
> the motor would have to be far larger.
>       The 3 cfm consumption rate would also be a problem I think.  For
> every minute of full power operation you would need about a 20 gal
> compressed air (at 90 psi) tank.  If you could store air at 2000 psi  (or
> use Nitrogen cylinders @ 4000 psi) then the storage problems would not be
> so bad.  But the compressor get expensive and slow, probably similar to
> charging batteries.  But at least the air motors - cylinder - compressor
> wouldn't go bad after 5-1- years, unlike batteries which have a limited
> life.
> 
>  Comments anyone?
> 
> Jay.
> 
> 
>                       "Pierre Poulin"
>                       <pipo305@hotmail.com>             To:       personal_submersibles@psubs.org
>                       Sent by:                          cc:
>                       owner-personal_submersible        Subject:  RE: [PSUBS-MAILIST] Pressure air drive.
>                       s@psubs.org
> 
> 
>                       08/01/2003 07:32 AM
>                       Please respond to
>                       personal_submersibles
> 
> 
> 
> Hi,
> 
> I've check some air grinders that could be transformed into motor.
> 
> Free speed: 25000 rpm
> - Operation pressure: 90 psi
> - 0.6 HP
> - Air consumption: 3 cfm
> - Weight: 1.5 lb
> 
> What do you think about that?
> 
> Pierre
> 
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