Water inlet

[Gezzer]

I need to fit a larger diameter raw water inlet into my hull and want to replace it with one of those scoop strainers, oval shaped.

The daft question is:

Which way round does it go, Long scoop facing aft, or the long scoop facing fwd, I would have thought the latter so that the fwd motion helps to push water up the tube, although I seem to remember something about keeping it out of the flow in PBO or something, does it matter ??.

I walked around the yard today but not many boats left and they all had round inlets.

I know it's a bit of a daft one, but any wise bods have any thoughts.



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[jleaworthy]

Apparently a slow boat has scoop facing forward; a fast boat has it facing aft - otherwise ram effect is too great. I assume fast means planing hull and slow means displacement boat.

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[bob26]

You can get strainers where the slots are machined for the whole length of the domed part so that there is no ram effect.


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[kgi]

On my own boat (30' cat) when i got it they were facing backwards, but i found that after a period of fast sailing/surfing it sucked my strainer dry and when i started the engines they overheated, turned them forward problem disappeared, could be i had a small leak in the system, i don't know, needless to say the problem no longer exists, my raw water strainers are quite away above the waterline so i have no idea if this multiplied the problem......keith

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[Birdseye]

mine was installed facing forward, but the problem was that if any piece of paper etc came against the inlet it was then held there by water pressure. so i reversed it and had the bulge forward and the gradual slope aft. no more blockage problems and no water starvation either.

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[paulrossall]

I have two water inlets for sale at half normal retail price plus some stop cocks. Brand new, bought as a job lot. If you are interested send me a PM detailing size required. Cheers. Paul

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[wiggy]

Mine have large part at front I suppose it keeps inlets clear of rubish and is more hydodynamic

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[Metabarca]

I was a little unsure of this too when I changed my water inlet this spring, so I sneaked a look at other boats: they were all with the bulgy bit forward and the narrower part aft. That's how I put mine, and no probs so far.

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[ccscott49]

They are "teardrop" shaped? The wide part faces forward.

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