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Author Topic: Water pump - any good?  (Read 4382 times)

getemuphigh

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Water pump - any good?
« on: December 10, 2010, 05:22:00 PM »

Hi,
Seen this for sale on good old e-blag

http://cgi.ebay.co.uk/RC-Submarine-550-Rolling-water-pump-/280597466453?pt=Radio_Control_Vehicles&hash=item4154e98d55

Anyone know something about these or better ones available or have something for sale???

I'm looking for one for my OTW - HMS Vanguard.

Thanks.

Edit - detail of pump added from ebay for future reference after sale has finished. Admin

RC Submarine - 550  Rolling water  pump
from    rc-sub-workshop - 30 GBP
Specification:
8v-13v, rotary, reversible Rolling pump for water bladder ballast systems.
Ideal for Medium or large boats.
Voltage: 8v-13v
Size: 90mm X 54mm X 61mm
550 motor, pump head and mounting bracket
Weight: 350g
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nemesis

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Re: Water pump - any good?
« Reply #1 on: December 10, 2010, 05:56:04 PM »

Hi, Looks like a peristalsis pump to me, you can get better ones for your sub, cheaper as well. Nemesis
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Circlip

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Re: Water pump - any good?
« Reply #2 on: December 10, 2010, 06:48:49 PM »

Close Nemesis, It's a perestaltic pump. These were used as an alternative to the piston type pumps on the early DIY submarine builds. This type of pump is the one you see in the medical programmes with the operating mechanism as a clear unit with the three legged rotor turning and pumping blood to the "Cleaning" systems.

  Although very effective, they suffer from the silicone tubing splitting after a period due to the crushing action of the rotor.

  Regards  Ian.
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submate

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Re: Water pump - any good?
« Reply #3 on: December 10, 2010, 07:12:35 PM »

Hi

MFA Como drills do a good one, 11 small and reversable  part no 650

regards
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Mankster

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Re: Water pump - any good?
« Reply #4 on: December 10, 2010, 07:48:54 PM »

Are you replacing the pump in an OTW module? If so a geared pump will suit you better. Persaltic pump take forever to fill. Even those big ones are around 250ml per min.

Subculture

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Re: Water pump - any good?
« Reply #5 on: December 10, 2010, 07:54:40 PM »

The OTW pump is made by Shurflo, it's the nautilus model, but they use a different (smaller) motor with it which is better suited to model use.

http://www.shurflo.com/rv-products/rv-pumps/classic-series-water-pumps/nautilus/default.html

I'm sure Bob can supply you with one.

A geared pump will also work, but pumping will be very slow compared with the Shurflo pump.

getemuphigh

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Re: Water pump - any good?
« Reply #6 on: December 11, 2010, 09:55:21 AM »

Thanks for all the replies and info...very very helpful.

It is for my OTW Vanguard but not for their WTC module, its an home made one that I want to fit a reversing pump in to get the water in and out faster / better.
At the moment it has a pump to get the water in and then uses the "squashed" air pressure to get it out by opening a pinch valve on a tube, works ok but like I say I want to make it better if poss.

Thanks again.
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getemuphigh

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Re: Water pump - any good?
« Reply #7 on: December 11, 2010, 02:04:24 PM »

Hi

MFA Como drills do a good one, 11 small and reversable  part no 650

regards

Hi,
Looked on their web site but can't see part 650 ??
Is it listed somewhere else??
Thanlks
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HS93 (RIP)

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Re: Water pump - any good?
« Reply #8 on: December 11, 2010, 04:52:29 PM »

it depends industry spells it differently   http://www.tygon.com/peristaltic-pump-tubing-market.aspx   http://www.watson-marlow.co.uk/  same type of pump I think,but hey  :D

Peter
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Subculture

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Re: Water pump - any good?
« Reply #9 on: December 11, 2010, 05:36:05 PM »

You won't improve on the OTW system for speed unless you switch to centrifugal pumps, or fit a bigger pump (not available commercially) and you'll need to use a different approach too, as they only pump one way.

Peristaltic pumps are always slow and bulky compared with other types of pump. Why do people use them in some ballast system then you might ask? Well they're self sealing, needing no pinch off valve, bi-directional and they're easy to rebuild.

The shurflo pump can pump about a gallon a minute. Good luck finding a geared pump that will match that, and is small enough to fit in a Vanguard.

You could parallel ina  couple of geared pumps, but then you have a current hog of a ballast system, and it will still barely match the shurflo pump volume wise.

submate

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Re: Water pump - any good?
« Reply #10 on: December 17, 2010, 12:36:53 PM »

Hi

MFA Como drills do a good one, 11 small and reversable  part no 650

regards

The pump is not on their web site but you can order by phone or online quoting P.NO 650
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getemuphigh

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Re: Water pump - any good?
« Reply #11 on: December 17, 2010, 04:54:56 PM »

The pump is not on their web site but you can order by phone or online quoting P.NO 650

Cheers, thanks for the info, I'll give them a call.
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Subculture

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Re: Water pump - any good?
« Reply #12 on: December 19, 2010, 07:22:34 PM »

Bear in mind that the Vanguard has a high waterline if you're going for scale looks.

Assuming you have all of the cylinder bellow the waterline, you will need about 850ml minimum to get to the correct waterline, more if some of the cylinder pokes above the waterline.
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