Matilda

[michael kemishParticipant @michaelkemish72883]

water cooling

[michael kemishParticipant @michaelkemish72883]

I don’t know yet if I have to cool my motors yet, but has anyone ever measured the  water-flow?

 How much is needed to cool 1 or 2, 540 type motors?

 In IC speed boats, they use a pickup in the rudder assembly, and there seems to be a fairly strong output from the side of the hull. Matilda wont be going that fast.

I’ve got a windscreen washer pump out of a car, and at 7 volts it pumps 1.5 L per min. (at about 5 amps!)

Any info would be appreciated.

Mick

 

[Dave MilbournParticipant @davemilbourn48782]

Mick

A few points worth bearing in mind:

There are 540s……….and then there are 540s. I have some examples which would fail to disturb the skin of a rice-pudding and others which would rip your arm off at five paces. All were sold as “540 motors”. The relevant data to consider would be the voltage rating, the number and thickness of the windings inside, and the current drawn under load.

If motors are not overloaded with props which are too big, or run on a higher-than-rated voltage, then they shouldn’t need any cooling at all. Don’t make the mistake of using fast electrics as the yardstick for motor applications!

Washer-pump motors are not usually rated for continuous running, and 5A is a heck of current. You’ll need a fairly hefty battery on board just for the pump – unless you’re fond of pond-side charging.

If you simply want some cooling water to trickle out of the model for the sake of realism then there are ways of doing it which don’t involve such extremes.

I’d suggest you try the motors first. If they get too hot to touch then it might be easier to change the props and/or power supply than worry about water-cooling. “Matilda” sounds more like a pussycat than a wildcat to me.

Dave M

[michael kemishParticipant @michaelkemish72883]

Thanks Dave, I’ll wait and see.I thought 5A was a bit on the high side too!

Mick

 

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