Here's a cheap idea for making the pump filter! the motor is in fact a windscreen pump from a car! dont forget to cut off the handle from the tea strainer
Move water at a high enough velocity, concentrated at the right spot on the target's hull, and... Seriously, I have considered installing a rotating pump outlet in certain particular ships, as part of my evil plot to sink another boat with an "unarmed" transport
That's a neat idea! Just need to make sure you use a plastic or stainless strainer, the cheap plated ones would corrode away quickly.
hahaha I found a chinese/arab shop in paris who sell 3 for 2€ plastic or steel if folk need to know I got plastic ones cause they fill in all the gaps when slightly squashed. and they weigh nothing
I used half of a ball-style tea infuser for the pump inlet strainer on my USS Gearing back in the day. With the entire ring and latching mechanism retained, cleaning it out only took a thumbflick followed by a brief squirt from a reagent squeeze bottle. If I'm not mistaken though, most windscreen washer pumps are gear pumps, which would make them positive displacement (prohibited by the rules of most clubs if I'm not mistaken) and not dynamic pumps.
Eurobusker, I'd recommend a 12V fuel pump (got one for my MGB for <US$20), it flows far more than the washer pump... and it's not that much bigger...
talking of "gear pumps" what are they? I just took one citroen pump apart and its just a dynamic pump. It wont suck water unless its in water. Maybe this pump is an exception.
I think what he meant to say was 'positive displacement' pumps are not allowed by MWC... so diaphragm pumps, gear pumps, and piston pumps are all no-no's. Although as you say, you're a long way from here
what I seen is a rotor which turns and pushes the water outside, just as I seen in many other pumps. however the first cm is like a drill and it starts off small inside a 1cm tube. Whats folk's opinions here?
Just out of curiosity, does anybody know why positive-displacement pumps are not allowed? Is it uber-powerful, is it dangerous, could it be used as a weapon?
Short Form: Basically, it'd be super damage control. No flow restriction. Long form: Because for clubs that restrict pump output with a restrictor, a positive displacement pump would negate the restrictor. A PD pump will move exactly it's chamber capacity*, regardless of restrictions, up to the mechanical limits of the pump (i.e. the pressure breaks the pump) or the limits of the prime mover (i.e. the motor can't make enough torque to go any further). Furthermore, if one could build a system that'd hold under the pressure (not TOO much of a task), you could literally use a PD pump to cut through the balsa hull of the ship next to you, using the restrictor nozzle to focus it. *minus deadspace, and other insignificant details. If you really want to get into that, talk to Greg who probably has more knowledge about fluid flow in his little pinky than I have in my whole body.
A positive displacement pump is like a early windshield washer pump. Two gears which have close tollerance and pump water through them. The reason that the rule is there is because one of the founders of the IRC, Stan Wilkens, thought that they could overpressure something past the pump gears there was a potential for an explosian (sp.). So rather than argue with a founder, the rule was passed and has been in the rule set ever since. I was there when the rule went in. Marty
Well, technically he was correct. See my long form explanation. A PD pump will pump until something blows. From a regulatory standpoint these days, it means that the restrictor that MWC and IRC use doesn't matter, if you allow a PD pump.
