Wednesday, April 17, 2013

Re: [Electric Boats] Illusive gear ratio THE RESULTS ON PAPER

 

Andrew Im blown away by your analytics.       My appologies ,    I was double checking the gear ratio because   the   tack results  came to 4 :1 and sure enough the big pulley is  10 "      

       Was the fact the boat was tied to the dock during all the tests accounted for ?    Humbly   Orest   
  


On 2013-04-17, at 7:18 PM, Andrew Gilchrist wrote:

 

According to the performance graph the maximum amps draw, at full throttle should be 13.6 amps, where the rpm will be 1788 this will output 8.8lbs of torque.

 14"pully 5.6:1 is a straight reduction to allow the motor to run at 1788 rpm; however at 14 amps and 14"pully the torque to the prop is only 47lbs whereas in the present setup torque to turn the prop at 275 rpm is 41lb and the torque rpm relationship is liner so maybe 290?

 

Go for 13.5"first it may be the best compromise and if you can borrow or rent a few options

 

Yours, 

 

Andrew Gilchrist

fastelectrics.com

Australia

0419 429 201

 



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