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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