Re: [PSUBS-MAILIST] Golf Cart Motor over Hydraulic

["Dan H." <jmachine@adelphia.net>]

There pluses and minuses to consider,  I'm sure.  I just can't find the
pluses of a hydraulic drive for a small sub.

First, there is the power loss.  Yes as Peter says, you can make it up with
more available power, but it's still a loss in either power or space and
battery cost.

Second, there is the noise of hydraulics.  The drive motor is noisy but a
pump is really noisy, and in the hull with you.  My electric motors create
noise, but in external pods and not nearly very loud at all.

Third, now you have high pressure oil to deal with.  Take it from a guy with
experience showering off oil.  Three days ago I was operating my backhoe and
blew a hose.  It wasn't the first time I took an oil bath and I'm sure it
won't be the last.  I wouldn't want to be submerged, blow a line and have to
breath the air.   Much of the oil gets atomized.  Also the oil clean up
inside or outside of the sub can be an issue.

An electrical thruhull isn't that difficult to make.  I've made several.  A
controller for electric motor speed isn't any more expensive then a flow
control for hydraulics.  Unlike tires on the asphalt, the prop in the water
already gives you the cushion effect that hydraulics can offer so there is
no advantage there either.  There isn't much of a reason to purchase a pump,
hydraulic motor, hoses and fittings, just to save some on a thruhull.

Dan H.

----- Original Message -----
From: <atozed@juno.com>
To: <personal_submersibles@psubs.org>
Sent: Friday, June 25, 2004 6:55 PM
Subject: Re: [PSUBS-MAILIST] Golf Cart Motors? Good? Bad?


>
> Hi Pierre,
>
>   I heard 85% instead of 70% but either way adding a battery makes up for
> the loss.
>  A through-hull electrical connector is more work and expense than a pipe
> through the hull.
> Small differences, these.
>
> Peter Korwin
>
>
> On Fri, 25 Jun 2004 16:59:44 -0400 "Pierre Poulin" <pipo305@hotmail.com>
> writes:
> > Hi Peter!
> >
> > Your set-up looks like a good idea but what about power lost? I did
> > some
> > calculation for a Kart some time ago (another wild project to have
> > the best
> > transmision possible...) and I end up with 70% efficiency at the
> > pump and
> > another 70% at the hydraulic motor ending up with only about 50%
> > power from
> > the motor to the wheel...
> >
> > Just my 2 cents...
> >
> > Pierre Poulin
> >
> >
> >
> > >From: atozed@juno.com
> > >Reply-To: personal_submersibles@psubs.org
> > >To: personal_submersibles@psubs.org
> > >Subject: Re: [PSUBS-MAILIST] Golf Cart Motors? Good? Bad?
> > >Date: Fri, 25 Jun 2004 10:11:34 -0700
> > >
> > >Hi Curtis,
> > >
> > >My sub has a golf cart motor turning a hydraulic pump, valved to
> > >hydraulic motors fore and aft.
> > >Valves control pressure and direction, I might add a (Curtis)
> > electronic
> > >motor speed control later.
> > >No wires outside, no bearings needing sealing-- it's simple.
> > >-Peter Korwin
> > >
> > >
> > >On Thu, 24 Jun 2004 11:24:31 -0400 "Curtis S." <n6654f@msn.com>
> > writes:
> > > > Just to let everyone know who I am my name is Curtis Soles and I
> > live
> > > > near
> > > > Ft. Lauderdale Florida. I have been folowing this site on and
> > off
> > > > for about
> > > > 2 years. I am planning on building a 2 person 1 atm sub capable
> > of
> > > > depth of
> > > > around 250 feet. Ok now for my question? I have some old golf
> > cart
> > > > motors
> > > > and I was wondering does anyone have any experience or info on
> > using
> > > > them in
> > > > a sub?
> > > >
> > > >
> > > > Thank You,
> > > > Curtis S.
> > >
>
>
>
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