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Old 12-28-2017, 11:45 AM   #11
JohnnieB
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Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
Default Re: Mechanical engineering question.

Quote:
Originally Posted by David Maner View Post
Plug the radius of the tire in your equation. What you're working with is foot pounds so you know that you start with 12 inches. if your tires are smaller than 24 OD then add to the figure you have, if larger then subtract whatever percentage of the radius to 12 inches is.

Heck now I'm confused too LOL
Oops. I never posted anything to say I'd figured it out. 37.4 Ft/Lb of torque at the motor gives me 656.8Lb of linear force where rubber meets road.

I also calculated what the torque applied to the axle/hub splines is and the reason the hub splines strip if the castle bolts aren't tight is obvious. The radius of the splines is about 25/64", so the gear ratio is 30.72:1, and the torque applied to the splines is over 30 time the force applied to the axle, or nearly 14,300 Ft/Lb is example above.

Here is a chart showing the gains and losses of various tire heights based on a stock 18" tall tire. That is the information most people are looking for. How much force is involved is mostly of interest of Techno-Nerds like me.
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File Type: jpg Tire Height vs Speed and Torque.jpg (178.6 KB, 0 views)
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