HTHM Posted May 30, 2008 Report Share Posted May 30, 2008 Is there a formula to calculate pounds thrust from an electric trolling motor to horsepower? The reason I ask is, I can get about the same speed from my gas motor as I can get from my trolling motor. Link to comment Share on other sites More sharing options...
brickNblock Posted May 30, 2008 Report Share Posted May 30, 2008 (edited) A great Q HTHman..... I dont have an answer for ya tho pal....... I'd sure like to know tho..from them do know??????? Mine dont work like your'n tho' Got a 115 johnson main w/9.9 merc.... on the front end ive a 74lb minn kota..and have been wondering the same thing lately. Its enough that in semi calm waters to not just steer but propell the boat whre i wish to go. Great 'Q' EDIT: wheres Wayne when you need him? Edited May 30, 2008 by brickNblock Link to comment Share on other sites More sharing options...
jace Posted May 30, 2008 Report Share Posted May 30, 2008 Is there a formula to calculate pounds thrust from an electric trolling motor to horsepower? The reason I ask is, I can get about the same speed from my gas motor as I can get from my trolling motor. simple answer, no. just like you can't calculate torque from the HP rating. generally speaking, the physically larger engine will have higher torque and much more push behind it which is why a 600HP 4cyl is useless for real get up and go off the line. For electric motors, it's comes from the amperage and, like gas engines, the physical size of the motor. Link to comment Share on other sites More sharing options...
John Posted May 30, 2008 Report Share Posted May 30, 2008 Torque x Engine Speed/5,252 = HP eg., 200 pound feet of torque x 4000 rpm / 5,252 = 152 HP The 5,252 number is a derivative of a series of calculations. Link to comment Share on other sites More sharing options...
Mike the Pike Posted May 30, 2008 Report Share Posted May 30, 2008 I have a 10 year old Minnkota Transom mount 46lbs of thrust with maximiser the motor has 3.1hp indicated on top of the motor. Link to comment Share on other sites More sharing options...
Guest skeeter99 Posted May 30, 2008 Report Share Posted May 30, 2008 roughly 1 h.p. = 15lbs of thrust (on most applications) so a 50# thrust motor would be roughly 3.6 h.p. 50lbs/15lbs=3.6 h.p. Link to comment Share on other sites More sharing options...
Tybo Posted May 31, 2008 Report Share Posted May 31, 2008 There is no true theory on hp to thrust. HP= torque Trust=propulsion Thier is a way to get close though. You need to know how much hp's and torque there is at the prop shaft and the rpms. from this you can convert it in to kilowatts. Then from kws you can convert to thust. Link to comment Share on other sites More sharing options...
forrest Posted May 31, 2008 Report Share Posted May 31, 2008 Here is a super informative link, unfortunately it was designed for rocket scientists: http://www.aerospaceweb.org/question/propulsion/q0195.shtml Link to comment Share on other sites More sharing options...
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