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Re: [PSUBS-MAILIST] Pressure air drive.
I was looking at a couple gear drive industrial air motors, and the
cfm went like 1hp=55cfm, 3hp=100cfm, 8hp=230cfm. This seemed to be
more accurate then standard air-motors, sice these had integrated
speed reducers. I was thinking tanks to the tune of a pair of 144" by
16" at 3000psi. I believe that would leave you with approx 60min run
time with 3hp motor. These motors are "water proof", but not submersible
...So that would have to be resolved. Scaring the local fish silly is
one of the concerns that had me leaning back towards electric. I also
checked the air grinders, and the motors aren't suitable for a drive
application, they use a different design that has a low stall pressure.
You last remark was great, though, since the fact that I was planning
on mixing submersibles with diving was one of the reasons I was considering
air. I wonder how long it would take to charge the tanks with an 80hp
diesel compressor? Any ideas on how to find out?
Warren.
> Pierre Poulin schrieb:
> >
> > 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
> >
>
> Hmm.. 3 cfm means cubif -foot- minute ?
> than it is
> are equal (sorry I think in metric..)
> to 3 x 0,3048 x 0,3048 x 0,3048 m = 3 x 0,028 m3 or 84 Liter
>
> if we estimate that the boat need two engines of 0,6 hp we need
> 2 x 84 liter = 168 Liter a minute.
>
> A normal scuba bottle has 10 Liters at 225 bars = 2250 Liters
> air and run the drive just 2250/168 = 13 Minutes
>
> A yard size bootle for weld gas has 50 liter and is 1,5 m (4,9 feet)
> high with a diameter of 280 mm (11 inch) runs about
> 5 times longer = 65 minutes..
>
> Two tanks of 50 Liters gives you 2 hours and 10 minutes..
> Not so bad - Batterys has to be replace after some years -
> pressure bottles not - and a 50 Liter industrial one is about
> 300 Dollar new and maybe cost the half if you purchase a used one.
>
> Problems:
> - to get an engine made from seawater resistant material
> - the noise ? -> no fish around the boat
> - the air bubbles all the time ? -> no fish around the boat
>
> Most problem is maybe that high pressure scuba compressor
> is mcuh more expensive than a battery charger.. :-(
> But for peoples which are allready scuba divers - and have allready
> a compressor - a solution.
>
> Carsten
>
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