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Re: [PSUBS-MAILIST] Bilge pump/thrusters
Hi, Peter . . .
My boat will have high output bilge pump/thrusters.
Output of a Rule Mate1100 is roughly 1100 gph (5 amps @ 12 volts) ~ $80 USD
per.
http://www.powerboat-reports.com/sample/bilge.html
The bilge pumps would have to be fairly high output depending on the design,
of course.
A wet sub or dry ambient the size of a snowmobile would require lighter
thrusters, obviously. If the bow, for example, is lightly massed, then a
lighter output is called for in the front end.
The sub's moment arms are important, too. Overcoming long arms (greater
leverage) would require lighter pumps. Mind you, with the longer arms
usually comes more profile and more mass, so . . .
Once you factor in all the degrees of movement the cost starts to go up.
Critical use? Not really. Useful? Very.
I do know that windage, current and the sub's wet profile (elevation) all
make it worthwhile to shell out a few bucks and get high output pumps.
For those considering the bilge pump-cum-thruster idea, consider that,
except for docking under super calm conditions, I wouldn't trust light
weight pumps even if it means saving money.
Two pumps for bow sidle [one each for port and starboard] and two pumps for
stern sidle [one each for port and starboard].
Reversible pumps would be ideal - can avoid a lot of cost and all the extra
complexity and labour. I could also put in y-valves to divert the water
streams and buy less pumps, but I'd like to minimize physical effort and use
simple switches. It avoids all the complexity of extra plumbing and
creating elbow room for moving the y-diverter valve(s).
Pumps would have to be compensated.
Sample panel layout:
======================================
|
|
| port stbd port stbd |
| < rocker switch > < momentary rocker> |
|
|
| BOW THRUSTER |
| (label)
|
| ________________________________________ |
|
|
| port stbd port stbd
|
| < rocker switch > < momentary rocker> |
|
|
| STERN THRUSTER |
| (label)
|
|
|
=======================================
For docking or other situations that require constant flow, a non-momentary
action switch would be appropriate.
I prefer including both the non AND the momentary action switches.
Momentary switches are perfect for quick adjustments while u/w and the
non-mom. switches are great for keeping the sub against the dock while
hopping out of your seat, opening the hatch, jumping out on deck and onto
the dock while scrambling with the bowline and fighting an offshore breeze.
Hence the high output pumps.
Rick
========================================================
----- Original Message -----
Subject: Re: [PSUBS-MAILIST] [Fwd: take some time and view my web sites...]
> Hi Rick-
>
> $10 in parts and $100 of your time, that is.
> You have enough inventing to do without becoming a kit assembler, much
> less a circuit designer.
> An eBay search for "pwm speed control" gave a single result, 16 ampres,
> 36 volts, $40.
> My advice is: make the sub useable, dive with switches first. Then add
> speed control, then maybe USB/joystick.
>
> Also: How much thrust will your bilge pump provide?
>
> -Peter Korwin
> =======================================================
> On Sun, 5 Dec 2004 00:19:22 -0800 "Rick and Marcia" <empiricus@telus.net>
> writes:
> > Warren - I was born in the year of the monkey (per your remark below)
> > but I still have some questions!!!
> >
> > If I read your email correctly, it's possible to build a motor speed
> > control for under $10.
> >
> > I have a joy stick (USB compatible) that I'm thinking of hooking up
> > mechanically to some pots for static maneuvering (sidle, pitch, yaw,
> > heave).
> > Would I be able to use the USB function without having to rely on
> > software?
> > Or am I better off to just cut the USB cord and go with my original
> > idea of a mechanical connection?
> >
> > Why the 555 timer? Caps? FET? PWM? Vas ist?
> >
> > I'm thinking of using simple 12V bilge pumps to generate water jets
> > for static thrust but they're simple on/off's. Variable speed controls
>
> > on the pumps would be nice if it's simple enough to do.
> >
> > Circuit diagrams?
> >
> > Rick Lucertini
> > Vancouver, Canada
> >
> > ===================================================
> >
> >
> > ----- Original Message -----
> > From: "Warren Greenway" <opensourcesub@yahoo.com>
> >
> > Subject: Re: [PSUBS-MAILIST] [Fwd: take some time and view my web
> > sites...]
> >
> >
> > > Thanks for some real good feedback. I would like to
> > > point out, though, that by fly-by-wire I meant using
> > > the electric drive motors directly. If it is
> > > all-electric then you can upgrade from switches to PWM
> > > via potentiometer, to digital, as you see fit or can
> > > afford. For instance, you can use a simple 555 timer
> > > IC with a potentiometer a couple of caps and a FET and
> > > get a PWM with dial-a-speed ability for under $10.
> > > Cheap upgrade, reliable, can be built by a monkey, but
> > > it has to be all-electric for this to be viable. So,
> > > that is all I meant.
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