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Originally Posted by Joe Johnson
What he shows is that a 2 motor solution is going to be MARGINAL at meeting the 10fps top speed and the 150 lbs pushing force criteria.
20 seconds of pushing is a LOT of time if your driver is trained to know where the edge of the envelope is.
FINALLY, I want to emphasize that I am NOT saying that I agree that 10fps and 150lbs is acceptable. But if is were, it is (just) possible with a shifter OR with 2 motors.
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Joe, you are 100% correct.
I myself never double checked the breaker specs. While I DID know they were capable of exceeding their rating, I had no idea for how long. You are right, 10fps and 150lb are possible to achieve from the same gearbox, using nothing but 4-motors and a dream.
However... I should now revise my previous statement.
It may be possible, but it is not practical. (or at least... I'll NEVER do it).
Now this is more of a "personal preference" type debate... but when I design drivetrains/gearboxes: I keep my current draws down as far as possible. (Slower is safer!)
I almost always design for continual usage, because... who knows. In 2002, we saw matches where teams were forced to go into extended pushing matches for close to the full 2 minutes... since we're dealing with a hypothetical game... I guess you are correct. However, my read on Matt's statement is for 150 lbs of pushing continuously...
When I am designing, marginal is NEVER good enough.
I like my drivers as far away from the "edge of the envelope" as possible, at all times.
Why limit yourself to 20 seconds? Sometimes that extra second of pushing can mean the difference between victory and defeat, and a popped breaker (even one that resets soon after) can often mean you watch the rest of the competition from the stands.
Whenever one designs to live on the edge, he might eventually find himself plummeting over the side. This is why, I never push my motors too hard. (Those FP's sure have a distinctive smell when they're overworked and underpaid!)
In this competition, reliability is key.
So, you've gotta ask yourself...
Why not just downshift and call it a day?
John, who wonders if CD9 will have a shifter under the hood.