Theoretically speaking ?

[DAKA]

HLBs issue got me thinking......

If I am sinking and I remove all the hoses from the seacocks

Black water out
Air con
head flush in
macerator out

Then I power up to 6 knots and open the seacocks, they will all act as bilge pumps as water is sucked out, the hole that is leaking also turns into a self bailer( as long as it is not in the bow directly facing the flow of water).

As long as I dont use a scoop pick up such as the engine cooling.

3 knots works in my tender self bailer........does depth/weight of boat make a difference to required speed ?

Volunteer required to test the theroy........

Anyone who has done a little pee pee on the move knows the head is emptied by natural suction .

 

[pentane]

How's about hacking off the raw water inlet hose to one of the engines? After you've closed the seacock of course /forums/images/graemlins/ooo.gif
Read this little nugget on a website somewhere.
Will take balls of steel I should think, esp wiv water pouring in, middle of nowhere, f10 gale etc
Still, deperate times require desperate measures.
Note to self, look up max flow rate of VP's finest....

 

[Fire99]

after you dear boy. I'll gladly hold your jacket (and valuables) for you! /forums/images/graemlins/laugh.gif

 

[LittleShip]

After an engine failure (dropped valve) I was towed in by a big Orange boat /forums/images/graemlins/ooo.gif
trust me water wont be sucked out.

How do I know............ well, never having been in this position before, nobody had told me to shut off the engine seacock whilst being towed. The water was forced past the water impeller and filled the exhaust which then filled the engine with sea water.

A self bailer may work on a dingy but trust me when the hull on a larger boat tries to climb the hump water definitely gets push in!! /forums/images/graemlins/frown.gif

Taking the hose off a seacock and dropping it in the bilge is a good way of removing lots of water as long as the engine keeps running.

Tom

 

[fireball]

The self bailer on a dinghy has a protrusion into the water creating a vacuum which the water in the dinghy then gets sucked into. They are not just holes in the bottom!

 

[ccscott49]

Emergency bilge pumping, I have an emergency pump belt driven off my stb main. Which is manifolded to all compartments and its a big swine, 4" impellor, 2.5" output and suction, shifts a lot of water.
I also have as has been mentioned a valve with a pipe into my engine room bilges, to allow the engine raw water pumps to draw from the bilges, on both engines.
I have seen massive paddle type pumps, on the shafts, cant remember where I read about those, but apparently they shift thousands of gallons! (as long as the shaft is turning) not a lot of use in Hadyn's case!

 

[DAKA]

The engine intakes have scoops to prevent the vacuum effect.

All other seacocks are flat and should act as a bailer.

I know if I have a pee at 25 knts there is a loud sucking sound from the head.


Fireball
My sailing dinghies did have a protrusion I agree but the dagger board hole didnt and it will suck air under the hull while goose winging and add valuable lift, dagger/centre boards should be made so you can remove them not just lift them.

 

[fireball]

Hmm - my sailing dinghies have centerboard gasgets to prevent this ... at ~15knots in the RS400 we still get some water up through the centerboard case ... I don't know about 25 knots - in an RS800 at just below this speed we have water bubbling up through the daggerboard case .... I suspect the same would happen to seacocks ....

 

[DAKA]

I am disappointed my theory is been eroded so please bear with me.

At 15-20 knots I assume you are on a reach and have 1/2 board ??????

The board at 15 knots could direct / force water up ??????

If the board was removed my theory would not let water bubble up ( unless you leave the water and splash down on a wave crest ?)

 

[photodog]

So,, if your sinking, just

A) Make a bigger hole in the bottom, (Or More)
B) Add power.

Good idea! Instead of a bilge pump, take a sledge hammer!

/forums/images/graemlins/laugh.gif

 

[DAKA]

Yes.

But remember you need to seal the hole once you stop/slow down.

Hole cutter and wedge standing by.

Anyone want to volunteer their boat ?

I am very good with fibreglass repairs or if wood I have a sealant gun.

/forums/images/graemlins/wink.gif

 

[fireball]

[ QUOTE ]
At 15-20 knots I assume you are on a reach and have 1/2 board ??????

[/ QUOTE ] Bugger that - at 15-20 knots I'm trying to stop the thing from hitting the blummin mobos that keep stopping in front of me /forums/images/graemlins/grin.gif ....

Made no difference - RS400 is centreboard, at 15+ knots the board has a tendancy to rise (due to drag) ... on the RS800 it is daggerboard and you'd not lift it even if you could spare the crew weight to try .... but on both boats water still bubbled up the casing ...
Now - on the Laser2000 in a F7 we actually had a fountain of water and that was through the centreboard gasget too! Kid you not - it was on Bala in Wales ... never been quite so quick in a 2k ... but we were last having had to do some penalty turns ... so threw caution to the wind and flew through the entire fleet in one leg ... /forums/images/graemlins/grin.gif

Make some flaps to put down in front of the seacock openings and I think you've got a winner there ... in fact - why not build in a purpose fit self bailer for mobos?

 

[DAKA]

I ve had a brain wave.

All I need is for someone to take out their paddle wheel while under way

say 10 knots.

A sucking sound will be herd and then reduce speed until water starts to come out ( could be as low as 2 knots) any water ingress can be sorted with an increase of speed)

No hole drilled, no hoses to remove.

I would do this myself only I am at work now and not due to return to my boat for a while.