help needed installing a water pump!!

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help needed installing a water pump!!

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27 December 2009 at 16:36 #24764
john jones
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@johnjones88170
hello im new here, just wondering if any one could please help me. im trying to install a water pump in to my fire boat for the water hoses, but having no luck… has anybody got any instructions or plans on how i go about doing this? or cananybody show me a set up? i basically just want to know how to connect it all up to make it work off the switch on my transmitter. thanks in advance. John
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27 December 2009 at 16:36 #1934
john jones
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@johnjones88170
27 December 2009 at 17:30 #24769
Dave Milbourn
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@davemilbourn48782
It’s a straightforward job to show this BUT we need some further information.

What type of pump do you have? What is its rated voltage? Do you wish to run it from the same battery as your main motor(s) or use a separate battery? Do you have a spare proportional channel i.e. not one of those which is operated by a 2-way switch on the transmitter? And finally, what make and type of radio are you using e.g. Futaba Skysport 4 channel, Spektrum DX5E or whatever?

Dave M
28 December 2009 at 12:30 #24783
john jones
Participant
@johnjones88170
thanks for the quick reply, i have not purchased the pump yet, but the 1 im going to buy is a high flow water pump for model boats which operates on 6-12volts. heres a link to the pump: Here

The transmitter i have is a FUTABA T7C 2.4ghz. I want to run it on a separate small 6v battery. yes i do have a spare chennel.

John

Edited By Colin Bishop on 28/12/2009 22:21:36
28 December 2009 at 16:42 #24785
Dave Milbourn
Participant
@davemilbourn48782
I think this is the same pump that MFA market as a model aircraft fuelling pump. It’s quite a low current device and not terribly powerful on 6 volts, but I’d not recommend running it continuously. For switching it on and off this is the device you might consider using:

http://www.action-electronics.co.uk/pdfs/P91.pdf Just use one of the two outputs shown. The switch is good for 10A continuous current per load.

If the pump output proves inadequate then I’d suggest trying the Graupner 12v one (Part #1951). I’ve tried one of these, which will fire a stream over 5 metres through a Robbe monitor!

Dave M
3 January 2010 at 13:10 #24847
Mike Davidson
Participant
@mikedavidson22772
John Does your pump transmitter have a channel on the receiver which is just a switch? the alternative is a servo operating a slide switch to apply volts across your pump motor. your biggest problem as I see it is getting sufficient power from six volts to produce a jet of water, my approach would be to create an accumulator which would be full of air which is unlike water, compressable, so as your pump put water into the accumulator,it would displace air which would generate pressure withinand give some force to push the water through your pipework and nozzleenough to form a jet, and have enough power in reserve to keep it goingfrom the “compressed”air. If your receiver has a switched power output or an electronic speed control, that is the way to power your pump motor, but in a previous model of mine, I ues a servo output to operate a micro switchdriving a relay switch for the power, that worked as a reversing switch for an Arun Lifeboat……………………………………… Mike Davidson in Plymouth
4 January 2010 at 09:24 #24860
Dave Milbourn
Participant
@davemilbourn48782
Mike

Sounds like something from either Heath Robinson or Ronald Searle to me! Most folk just connect the pump to the monitors, and we’ve moved on a bit from microswitches atop servos – see the two Fireboat photos in my album (customer’s boat). That’s just the one pump working that lot.

Dave M
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