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parastolic pump - pump

R/C Submarine modelers

Postby Rick Teskey » Tue Jun 17, 2003 7:39 pm

Has any one tried using a parostolic pump and in a closed system with no vent too the tank.?
The only thing that it may need is a pressure switch too cut out and in too prevent over pressureization.
If this will work it may be a viable alternative too gas or centrifical pumps that require a vent.
Rick :p
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Postby JWLaRue » Tue Jun 17, 2003 8:36 pm

Hi Rick,

I have heard of this being done.....can't quite remember who did it, however.

The idea of a closed system using a (air or water) pump definitely works. The dive modules offered by OTW use this same principle.

-Jeff
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Postby AdriaticSea » Wed Jun 18, 2003 4:58 am

Hello all,

I've discussed a lot on closed loop ballast system on another sub forum...it's used in Sheerline model submarines(United Kingdom), and it works really well.
In Sheerline's design a pressure switch is not needed because the tank is strong and sealed enough to withinstand the water pressure of the working pump.
The only thing is that the pump doesn't automatically shut off-but it must not be an issue, because, as some English told me, when the periscope of the boat are under there's no point in keeping operational the pump.
The pressure switch would be a good idea as auto-stop device.
Howewer I don't have a Sheerline sub...I simply discussed the pro and cons of this ballast system with people that have a Sheerline model!
BEST REGARDS MAURO
-Rapidi ed Invisibili-
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Postby Martin Entwistle » Wed Jun 18, 2003 12:27 pm

Hi Rick
Francis Fearn used one in his Delta research sub. If you go to www.modelboatmayhem.co.uk/ and then to "Your Models" you should find it. It works perfectly and won a Gold at the London Engineering Show earlier this year.

Martin Entwistle
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Postby raalst » Sat Jun 21, 2003 5:21 pm

Hi all,

Over here (europe) such a system is sold by
norbert brueggen,
have a look here
who puts it in a delta submarine kit. should be
the beast referenced in reply above.

Regards,
Ronald

PS, Norbert also sells overseas, I believe...
Regards,

Ronald van Aalst

--------------------------------------------
Just here to Learn
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Postby Martin Entwistle » Sun Jun 22, 2003 2:49 pm

Ronald is correct, Francis's Delta is from a Norbert Kit plus some extra's like the camera's

Martin
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Postby Bill Marks » Wed Jun 25, 2003 8:11 pm

Has anybody found a source for small peristaltic pumps?
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Postby smwarships » Mon Sep 08, 2003 9:15 pm

Hello All,

Does any know the Pros and Cons of using
peristaltic pumps?
I have looked at the photos of this pump and it looks
like it would be easy make .......

Darle
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Postby KOEZE » Tue Sep 09, 2003 2:51 am

Pro's
Watertight (no need for a valve)
Very precise (the amount of water per revolution is predetemined)

Con's
Low volume
Wear of the hose when wrong material is used.

Norbert Bruggen, by my knowledge, only uses it in his Delta as this sub has very limited bouyancy to overcome.

EJK
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you get older because you stop playing.
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Postby Art Broder » Tue Sep 09, 2003 8:47 am

Gents,
The Recirculating Compressed Air Ballast System is a CLOSED system that uses an on-board air compressor (pump) to inflate a Neoprene bladder. This forces water out of the wet hull, and is reversible, to adjust buoyancy.
See descriptive article and pictures at: Art Broder's Models and click on ballast system, docs and pictures.
The 6-12V pumps and Neoprene bladders are available for purchase on-line.
Art Broder
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RCABS- It's easy to control your own bladder!
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Postby SubCom#2021 » Tue Sep 09, 2003 8:50 am

I am (still) working on my FX Alvin.I have tested a pump which came with my Sheerline dive system,however pressure was too low and it could only fill 50-60% of closed tank volume.

Next I bought geared (fuel) pump for r/c planes and it fills 80% of tank volume.
http://www.hobby-lobby.com/fuelpump.htm (HLFK190)
I've heard that this pump isn't tough enough for continuous use,but in my setup,so far so good.

My setup is;
(pump)-(1way valve)-(closed tank)-(solenoid blow valve)
solenoid valve is McMaster #7877K55 or K25.Pump and solenoid valve are controlled by Subtec SES-2.




Edited By SubCom#2021 on 1063112159
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Postby KOEZE » Tue Sep 09, 2003 10:48 am

Art, I've been looking at your ballast system. The neoprene bags might be something I could very well use in my pump ballast system. What are they used for exactly. I understand that they are for medical purposes. Maybe my wife (nurse) can get her hands on a couple of them.

EJK




Edited By KOEZE on 1063118942
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Postby Art Broder » Tue Sep 09, 2003 1:26 pm

Koeze, and other modelers,
The replacement bladders are used in the arm cuff of a sphygmomanometer(blood pressure device). The kind to use for model use is the Neoprene bladder. The ones that come in the blood pressure monitors are now thin plastic, and do not have the strength nor the elasticity needed for our purposes. Internet sources are , AllHeart.com , or SafetyStore.
Also, the source for the small air compressor(pump) is , Goldmine-elec.com. Search for air pumps.
Hope this helps you and others who may be interested in RCABS. (Recirculating Compressed Air Ballast System)
Art Broder
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Postby Sub culture » Thu Sep 11, 2003 4:08 pm

Art,

Are those pumps you mention the same as these:-

http://sales.goldmine-elec.com/prodinfo.asp?prodid=6142

If so, any idea on the pressure these pumps can each?

Regards

Andy
'Why are you staring at an empty pond?'

Want to dive your boat in crystal clear water? Then you had better Dive-in- http://www.diveintomodelsubmarines.co.uk
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Postby smwarships » Thu Sep 11, 2003 4:23 pm

Hi Andy ,
That pump you located at goldmine-electronics is a small
air pump , it would be ideal for filling a flooded ballast tank
with air to remove the water.
The peristaltic pumps would be used to pump water into a
sealed ballast tank . Normally the peristaltic pump has a rotor
with 3 fingers , the rotor spins and the fingers are in contact
with a rubber hose , as the rotor spins the hose is
compressed forcing the water in the hose to travel in the
direction of rotation , this rotation also causes suction to
build inside the hose pulling the water in behind eash finger
on the rotor .
The problems with this pump is the wear caused on the hose
from the fingers rubbing it and compressing it .
There is some hose out there someplace that can be used
with this pump , however I do not know what type of hose
that would be or where to get it ....
Does anyone have this information ? ???

Darle
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