Removing water from the hull......

[ScarabChris]

....while underway.

I had one of those RAM bilge pumps in my 54" Fountain and after one run it failed. Not sure why but it just doesn't work.

So then I was looking at this fitting......
http://www.offshoreelectrics.com/pro...?prod=gnd-4191

The claim is that you can use the discharge side to suck the water from the hull at speed. Must work on some kind of venturi effect.

Anyone try something like this? I think as long as long as you make the suction loop higher than the outside water lever it should work..

I do understand the theory behind the venturi effect very well, thats how I know it must be set up perfect or it won't work. Just curious to know if anyone has a formula for this that works.

[jac4412]

Chris that system seems to be a simple siphon system, should work no problem. I've never used it on a boat but have used it in my lab...

I have run an old rc boat with a pump system that runs right off of the main motor... It was a slow brushed system and the boat most likely only hit 10-15 mph on a good day but I could swamp that thing and it would pump the water out as long as the motor ran...

On this note I don't thing that it is practical for a high speed brushless system, but you might be able to work up some sort of system on the same logic or idea.

Might I ask where the heck youre getting so much water inside your boat from?

[ScarabChris]

I'm not getting very much water in the hull, but if I do I would like it to leave on its own. With all the electricity in this hull I would hate for the prop shafts to throw water all over the place without my knowing it.

[carlcisneros]

Chris;
many years ago I used something very similar to that on my first deep V hull with an OS 10cc
nitro motor in the boat.
It worked great and yes, you need to make a loop of sorts that is higher that the water level
with the boat sitting in the water or the water will possibly syphon back into the hull.

[ScarabChris]

Chris;
many years ago I used something very similar to that on my first deep V hull with an OS 10cc
nitro motor in the boat.
It worked great and yes, you need to make a loop of sorts that is higher that the water level
with the boat sitting in the water or the water will possibly syphon back into the hull.

Yeah the loop is a given. I'm hoping someone has a drawing of this venturi system that works. I figure I have done enough experimenting with this hull.

[sundog]

I've used float-type auto bailers in the past (jet boat), and while they have worked, I always got that sinking feeling when not underway. You're depending on a rubber o-ring to seal against a floating plastic ball. A little piece of flotsam in there and you're sinking (granted, slowly). I've since removed them and instead installed 'one of those sponges that are hard when dry' in the bottom of the hull. It does a good job of absorbing any encroaching h2o. And low tech too - I like that best. Sdg

[ScarabChris]

I have used the auto bailers (or as I like to call them "auto sinkers") on my gas boats. They were especially scary when the gas engine would stall and be floating out in the lake. The rule is you must wait until the rest of the boats are brought back in before you can go out after your stalled boat.

During this time I can see the boat sitting deeper and deeper in the water.

I am on the fast electric thing because I was tired of yanking starter cords and stalling. I no longer use auto bailers because I was tired of the boats sinking while awaiting rescue.

I have to imagine a boat filling with water containing four 6s 5000 mHa batteries, two 180 amp ESCs and two huge Leopard 5692 BL motors will have a more expensive effect than just a gas engine.