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Old 10-25-2010, 02:19 PM   #41
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Originally Posted by gospeed81 View Post
I think we can agree that there are several ways to analyze this problem.

I was trying to demonstrate what I believe is the easiest method since steady state can be assumed at top speed.

Where I was wrong is in taking the tone that it is the only method, which it clearly is not.

There are lots of examples in this thread, and I can't go through all of them because actually getting a degree is more important to me today. A lot of them rely on assumptions or variables like equivalent gearing...therefore motor speed. I tried to account for this if you actually read my post...and am convinced that gearing is key, and variable, to take advantage of the power the two different motors will produce.

I'm only adamant about this because I had to write some code last week that optimizes gear ratios for max_speed given a torque curve and other forces on the vehicle (drag, incline, rolling resistance etc.).

Solve it however you wish, but don't discount the fact that my answer is still plausible (and received a 99 from the prof).
I agree, I think it is the external forces that require you to account for tq in the top speed. Without a certain level of torque, I think it might become difficult to overcome the wind resistance. OR, it requires more and more hp. Sounds like you have it figured out.
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