Just ordered one on Amazon, will be here tomorrow %uD83D%uDE0A
Thanks very much for the info
Steve

probably cheaper to get a watt meter

http://www.ebay.co.uk/itm/FT08-RC-150A-High-Precision-Watt-Meter-Power-Analyzer-w-Backlight-LCD-UK-D5DC-/252153701329?hash=item3ab58823d1:g:FFMAAOSwniRWN0ba

one example. They are cheap and made for the job ( probably not as accurate as a good multi meter but WAY cheaper and if you wreck it no big loss)

Thanks for that I will have to get a new volt meter as mine only gone up to 10A.

What do you think to clip-on ammeters as used by auto electricians? I think they can measure up to 75A.

Watch out most cheap multi meters only go up to about 10 A.

While that may seem a lot when you want to get power from low voltages ( 12V or so ) 10 A is soon exceeded what is the rating of your ESC?

You need to be able to measure round about that figure.

Teeny tiny 1806 motors can draw over 10A

http://www.radioc.co.uk/DYS-1806-2300KV-Motor-p/2014.htm

Thanks Dave I'll have a go at it, I have a multi meter so can do it with that, also have a good supply of water too we call it a pool so can do the full test at home Bril.

Thanks again Dave

Steve

Hi Steve
You use an ammeter. You can do this at the lakeside by holding the model in the water and running the motor at full power. This will give an indication of the max current drawn. it will be higher than on the water as the motor will be fully loaded with no forward motion, which will reduce the amps drawn.
There are many Wattmeter/Ammeters available for about £20 and allow for up to 100 amps . For smaller models you may be able to use the amp range on a multimeter up to about 10 amps. The meter is wired in series with the motor and Battery.
There are bits of kit that will measure the current on the water and transmit the info back to the TX. I use such a system with my TARANIS TX. There is a cost involved and if you are just starting the wattmeter is a cheaper and easier to use option
Dave