Old 10-27-2012, 06:56 PM
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Join Date: Oct 2005
Location: N.Staffs, UK
Posts: 2,350

Forget about pipes for a minute. If you increase voltage and leave the load (resistance) the same the current will increase. If you want to get the current back down to the original value you have to reduce the load (equals roughly increasing resistance). In our real world we do that by using a smaller propeller (no idea about cars). BUT NOTE - what we're talking about is the EXTERNAL load resistance. NOT the internal resistance of the battery. Different things all together.

And yes it's a good idea to keep the voltage limit specified by the motor manufacturer but note that there are other (current and power) limits which are also provided by all decent manufacturers. Exceeding the voltage (by a bit) usually does less immediate damage than exceeding the others.

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