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Old 06 October 2004, 18:41   #11
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Country: UK - England
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Quote:
Originally Posted by lc0021
Is it not necessary to put a large U bend on it to stop water syphoning back when the exit is under water - say in the stern wave when slowing down ??
Don't worry about water siphoning in thru' a 1" tube, just worry about the wave coming over the top! You can control the stern wave with the throttle, anyway.
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Old 06 October 2004, 19:19   #12
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On the outside of the transom, the pipe only turns down enough to lock it in place.So its outlet is actually about 3/4 " below the top of the transom.
Havn't noticed any problem with flow back as yet; but if it does I will have to get up courage with a big drill and run it in flexi hose up higher through the transom. Hate to do that as dont want to get too crowded with wires and pipes.
On one side I have the VHF antenae and the other side, the Mount for the Nav.lights.So wanted to keep a space nice and clear to put a transom mounted swim ladder at a later date;
cheers Dal
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Old 06 October 2004, 19:26   #13
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Freeboard

Richard,
was undecided about that for a while when ordering the boat.
Whether to go for a longer shaft on the engine and have greater freeboard,which I thought "safer" . But on thinking again, If the boat gets swamped, thats a lot of water to empty out.Whereas with lower freeboard a lot of that just flows straight out over the transom.
So not sure what the "experts "think; but I went with the lower freeboard(As also I dont carry a heavy loading on the boat)
cheers Dal
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Old 10 October 2004, 04:31   #14
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Quote:
Originally Posted by Richard B
Don't worry about water siphoning in thru' a 1" tube, just worry about the wave coming over the top! You can control the stern wave with the throttle, anyway.

Sure - I realise you can control the sternwave with the throttle under most conditions.... and it's not really the quantity of water I'm concerned with - it's the back pressure on the pump - the issue is that if the exit is (say 2 inches) below the level of the transom - you now have the pressure of the stern wave coming back up the pipe and acting against the pump (which may be pumping at the time...) BEFORE the water is coming over the top...

I wondered if this

(a) would lead to situations when you effectively have no pumping action or

(b) might either damage the pump or blow a fuse from excess load....
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Old 10 October 2004, 04:37   #15
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The reason I mentioned this is because I just fitted a bilge pump - and I wasn't happy about drilling the transom - for all the usual reasons about putting another hole in the boat - etc - as well as hagving this thing about the back pressure... I had searched for a one-way transom fitting to no avail - If I had found one I may have gone ahead with the Black & Decker... - so I ended up putting a large (18 inches...) U-Bend on the exit hose and taping this on the A Frame with the exit hanging just below the top of the transom... (not pretty - but reasonably well disguised)...
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