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pump pressure? - psi?

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Postby robert lipsett » Sun Jul 06, 2003 3:50 pm

where can I find this dick smith's electronics for the pumps you are talking about
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Postby smwarships » Sun Jul 06, 2003 4:23 pm

Hello,
This link will take you to Dick Smith's website .
The pump that we have been talking about pumps in
one direction only .

Dick Smith's

Here is the link that will take you to the page listing the
water pump . This page shows 2 water pumps , the P8907
pump is the one that has been mention here .

Pumps page

I hope this helps ,
Darle :D
Scale Model WarShips
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Postby Don Prince » Thu Jul 10, 2003 8:09 pm

Hi Guys,

First off, I'm a amature at this hobby. I'm in my 3rd year as a member of The Subcommittee. Therefore, everybody knows where I'm coming from.... I have been doing some internet hunting for a water pump for my OTW Type VIIc U-boat (the hull is completed). I found a Surflo RV/Marine pump OEM 100-000-21. It is rated at 2.1 bars (30 PSI) @ 12 volts. The size is 4.8" L, and less than 2" W/H. I think it would fit into a 3.5" WTC. It will be a tight fit with the intake and outlet ports opposite at the pump head (2.6" tip to tip). I was going to use a pressure switch to stop the flood and a Check valve on the pump intake. I haven't figured out how to control blowing the ballast yet. I could use another valve and simply dump the ballast, or set-up a control circuit to reversing the water pump.

1. Is this water pump OK to use?
2. Suggestions on controls?
3. I'm willing to learn!

Regards,
Don_
"A man's got to know his limitations"
Harry Callahan SFPD
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Postby smwarships » Fri Jul 11, 2003 3:46 am

Hello Don,
I don't know how much the rv pump will cost you , but I
believe the cost of the water pumps from Dick Smith's will
cost less and do a good job for you .
You could always make a check valve using a steel BB
and 2 sizes of brass tubing .If done right the water pump
forces the BB off it's seat with ater pressure . When the pump
is shut off the water and air pressure forces the BB back onto
the seat and keeps it there .
To release the water in the ballast tank you could use a
normally closed KIP solenoid , use a small micro switch
that will be triggered by a servo to apply the voltage nec.
to open the valve .
I am going to be doing a little work on some electronic
fuel injectors , something that can be bought from the local
auto salvage yard for $10.00 each . I am going to try an
open up the injector so it has a bigger flow . If my
modification works this will be a good cheap source of a
water control solenoid . A KIP solenoid will cost about
$40.00 to $50.00 and about 4 or more weeks to get the
unit .

Darle :D

Scale Model WarShips
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Postby Don Prince » Fri Jul 11, 2003 7:31 pm

Hello petn7,

1. Where are you in South Carolina (The State Flag)? I'm in Lexington, just outside of Columbia.

2. You got more than the cost of a years subscription / membership to "The Subcommittee" with the help provided to you by this forum.

3. Join now, and drop me a line....

Regards,
Don_
"A man's got to know his limitations"
Harry Callahan SFPD
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Postby petn7 » Fri Jul 11, 2003 10:33 pm

i'm from Clemson
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Postby petn7 » Sat Jul 12, 2003 7:08 pm

ignore



Edited By petn7 on 1058069061
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