Why don't we sink?!

[pampas]

Re: Why don\'t we sink?!

Many years ago in an early PBO there was an article about using a horizontal pipe,closed ends with a ball inside. Cockpit drains crossed ,on top inlets with one centre drain. Thought when I was a yung,un that this was the bees knees, but have never seen one, except a variation of this methed was used in early model aircraft before the common clunk tank method was developed.

 

[BlueSkyNick]

Re: Why don\'t we sink?!

[ QUOTE ]
...which is why we close the seacocks when we leave the boat - otherwise your pride and joy is at the mercy of some hose and a couple of jubilee clips!

[/ QUOTE ]crikey Simon, all of them??? I dont even know how many there are, just that some of them are blighters to get to easily, eg under the forward berths for example.

 

[srp]

Re: Why don\'t we sink?!

[ QUOTE ]
So your cockpit remains wet when heeled or have you found a way to move water uphill? Weird indeed. /forums/images/graemlins/confused.gif

[/ QUOTE ]
If you're heeled you're usually moving. The pressure at the outlet will be low because of the speed of the water flowing over it so it will suck water from the cockpit drain hose. That's how the self-bailer works on a racing dinghy.

 

[Leighb]

Re: Why don\'t we sink?!

[ QUOTE ]
So your cockpit remains wet when heeled or have you found a way to move water uphill? Weird indeed. /forums/images/graemlins/confused.gif

[/ QUOTE ]

My drains are crossed over, but the heel angle would have to be considerable before the angle from the down hill cockpit opening to the uphill outlet to sea was horizontal or above.

So water does not flow uphill, and sea does not come in through lower drain which is well immersed. /forums/images/graemlins/grin.gif

There are interesting gurgles from the immersed drain.

 

[Dougal]

Re: Why don\'t we sink?!

My cockpit drains are glassed in, and have no seacocks. Is that a good, or a bad thing? I've had some folk look at them and then do that big deep sigh..... you know the one.... Then go on to say something like.... "what you want to do is....". You know the type i'm sure.

 

[damo]

Re: Why don\'t we sink?!

There was at least one grp boat I read somewhere where that feature was built in - seems very sensible to me /forums/images/graemlins/smile.gif No worries about corroding seacocks and clips, perishing hose etc.

 

[damo]

Re: Why don\'t we sink?!

There was also at least one production boat with a bonded horizontal pipe and a drain feeding the centre of it. Maurice Griffiths??

 

[rhumlady]

Re: Why don\'t we sink?!

Carefull folks, the nice people at Jubilee don't take kindly to people using their name as a generic. You all mean hoseclips I think.

 

[ex-Gladys]

Re: Why don\'t we sink?!

[ QUOTE ]

If you're heeled you're usually moving. The pressure at the outlet will be low because of the speed of the water flowing over it so it will suck water from the cockpit drain hose. That's how the self-bailer works on a racing dinghy.

[/ QUOTE ]

Errr...no... A self bailer works because the lowered flap (Elvstrom type) creates a low pressure area BEHIND it to suck the water out. An 'ole in the bottom won't suck water out, without an induced low pressure area. There was one version I remeber that went stragiht down, but that had a venturi (as with a carburettor) to induce the pressure drop.

 

[srp]

Re: Why don\'t we sink?!

Well, I'm not going to argue about it. I know that's what happens on my boat - seen it suck the water out before my very eyes. It may not be quite as efficient as a proper dinghy self baler but it happens all the same, as long as I'm not heeled over on my earoles /forums/images/graemlins/smile.gif