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Prop torque question
Joe wrote:
I'm hoping someone might have a refference site for free wheeling prop torque produced by a prop around the size of a 20X20 sailing at hull speed. (9kts) One goal on the boat we are designing and building will be an electric drive system and we are leaning towards a power phase 150 drive. http://www.uqm.com/propulsion_specs.php It's a 200 HP perm magnet motor, so as you sail and the prop turns it will generate power for the battery banks. These motors are now being used in electric hummers in the Army. They need 420 volt DC using two banks of batterys (35 batteries each bank) and will require 75 LBS or torque to generate electricity. Now I'm pretty sure the torque on a prop around the 22" size will be way over 75 lbs but do not know exactly. Im hoping it's twice that at least for gear reduction. So I'm hoping someone might have, or know where I can get data on prop torque. If not.... I guess I'm going to have to get a monkey wrench and a scale and find a boat of the proper size to test. Any suggestions? Joe As a starting point, it will probably make about the same amount of torque as it uses under power - for the same prop rpm. |
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