Duke of Northumberland

[ashley needhamParticipant @ashleyneedham69188]

Neil. A rotary valve from . say, a French horn would do nicely. The tolerances are very tight, and there is no resistance to the turning motion at all. Some VERY SLIGHT leakage across the valve face would have little or no effect I would have thought. A competent engineer could make a rotary valve out of ally/brass surely??

Looking at the Ruthven drawing it seems the pump rotor is horizontal, so water would be admitted from an inlet in the keel almost I suppose. Are your pumps horizontal or vertical?? A hole at the keel would likely only let in water and not too much air.

Side outlets would allow great manoeuvrability at low speeds, ideal for a lifeboat.

Ashley

[neil hpParticipant @neilhp]

 

thanks for the confidence boost Ashley but you have more confidence in my engineering than I do………..I was a woodworker where we worked to the nearest 1/8 inch………..not thousands of a mm, lol………think I'm going to stick with Dave's solenoid switches and his other components once I have the plumbing installed. the pump can be either, Ashley, and the inlet scoop will take tandem 15mm pipes into a Y copper fitting​, so plenty of water into the pump will be available………but looking at the pump, I have an inkling that it would also fit better in the horizontal mode too……….hope to go over to Blackburn next week to have a look at one………taking my boat for a dry fitting lol.

 

Edited By neil howard-pritchard on 16/11/2017 22:30:44

[Dave MilbournParticipant @davemilbourn48782]

Neil

Don't spend any money until I've had another good think about this. These are stretching times for the old intellect.

DM

[neil hpParticipant @neilhp]

I wasn't intending to Dave……….and will wait upon your advice………….you know I appreciate it and listen to you.cheers.

[ashley needhamParticipant @ashleyneedham69188]

Laying the pump down horizontal will also lower c of g, important with all that water in there and copper pipe.

Ashley

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