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Author Topic: Water pick up  (Read 2098 times)

STEVO

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Water pick up
« on: June 16, 2010, 11:47:15 PM »

Hello, has any one any thoughts on the best place to fit a water pick up on a 32inch delta force hull.

Thank you. ok2
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martno1fan

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Re: Water pick up
« Reply #1 on: June 17, 2010, 08:07:07 AM »

Usually the rudder has them ?,if not you can buy one that fixes on the transom,put it on the right side of the keel line so when your turning it stays in the water.Or you can buy flush ones that fit under the hull,these cause less drag but a bit more work to fit.
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w3bby

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Re: Water pick up
« Reply #2 on: June 17, 2010, 09:17:32 AM »

Do your own flush fit, brass tube and a hole in the bottom, cheap, easy and works well with minimum drag.

steamboatbob

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Re: Water pick up
« Reply #3 on: June 17, 2010, 11:06:50 AM »

curved brass tube going to opposite side of rudder works well
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ghost123uk

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Re: Water pick up
« Reply #4 on: September 26, 2010, 10:08:33 AM »

Resurrecting a slightly old thread  %)

Is there any downside to flush fit pick ups ?

My new(ish) to me Fairey Sword (deep V & submerged drive) has a moulded protruding twin pick-up to feed the Irvine 61.
Twice now I have had bits of weed get hooked on it.
Luckily I always keep an eye on the water outlets so no damage has resulted.

So, I was wondering whether to mod it to flush fit type to avoid that problem and also to reduce drag. (I wonder how much effect the drag of my moulded pick-up has ?)

Comments invited  :-))

Hope this is not considered a thread Hi-Jack  %)
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martno1fan

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Re: Water pick up
« Reply #5 on: September 26, 2010, 10:15:37 AM »

Flush pickups are def a better way to go,no drag and plenty of water and they wont clog up either,you can buy them off the shelf .

http://stores.ebay.co.uk/PMB-rc-parts__W0QQ_sidZ72990563?_nkw=water+pickups
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Arrow5

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Re: Water pick up
« Reply #6 on: September 26, 2010, 11:02:34 AM »

I presume we are talking high speed craft for flush pick-ups ?  At what sort of boat speed does the water get forced through the system or are they fitted where they get prop-wash ?
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martno1fan

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Re: Water pick up
« Reply #7 on: September 26, 2010, 11:13:24 AM »

You would be surprised how well they work,even 10 mph they work fine,also if you turn em wrong way round you can make a great auto bailer,as the boat runs they suck water out using the bernouli method  hope i spelt that correct lol.If you search on google you should find some info on how its done.Pickups are fitted under the hull near the transome arrround 1" away and similar distance up from the keel.
Mart
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Arrow5

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Re: Water pick up
« Reply #8 on: September 26, 2010, 11:35:47 AM »

10 mph, fast for a Springer !!!!! {-) Thanks Martin.
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martno1fan

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Re: Water pick up
« Reply #9 on: September 26, 2010, 11:38:52 AM »

They might well work slower than that i dont know m8
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ghost123uk

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Re: Water pick up
« Reply #10 on: September 26, 2010, 12:50:35 PM »

Thanks for the input folks  :-))

My multi race boat did not have fancy shaped pickups, (as in the link provided above by martno1fan).
It just had 2 x holes immediately behind the prop (that fed the motor and pipe via copper tube)
That seemed to pick up OK (presumably using the high pressure area that must exist in that location).
Just have to see how well a simple set-up like that works at lower speeds (as I don't want to start hacking the hull too much).

With that in mind I think I will remove my draggy moulded pick-up and try a simple surface mount type, if it does not work, I can always glue the moulded thing back on ! 
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martno1fan

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Re: Water pick up
« Reply #11 on: September 26, 2010, 03:39:45 PM »

Have you thought about a prop blast pickup ? this is just a tube that is directly behind the prop out of the water and is fed by the prop wash,they work well also,easy enough to make or you can buy them.Good idea if you dont want to cut holes etc.
Mart
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