Friday, July 27, 2012

Re: [Electric Boats] Re: PWM output measuring

 


Geoff

to measure the difference in props absorption

measure the watts in + rpm - luckily the amps are the independent
variable which for the same rpm shows you how much extra or less torque
the prop requires to turn it

you could measure bollard pull for low speed or the over the ground
speed of the prop for cruise peak speeds

Compare how much power , particularly torque (amps are directly
proportional to torque), which also bears most heavily on economy. In
the end the least current draw probably wont be the most economical in
terms of the distance possible or the thrust made

Andrew Gilchrist
www.fastelectrics.com

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