John's analysis is right as far as it goes in that his arithmatic is correct.
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.
His main objection is that of current draw exceeding the rated current of the breakers at the 150 lbs rating. Yes this is true. But this is where you have to balance your particular plan for the game and your drive skill.
While you cannot stall for long periods of time, it the breakers can go a quite a bit longer than many of you folks seem to realize.
I don't have the Snap Action data sheet handy, but from the
Bussman website, you can clearly see that a 40 Amp fuse can carry 80 Amps for 20 seconds before tripping.
20 seconds of pushing is a LOT of time if your driver is trained to know where the edge of the envelope is.
If you are Wildstang or Chief Delphi or one of the other teams that love Swerve, you can win not by brute force but by pulling at angles.
So... ...I feel I am just justified in the 10fps & 150 lbs with 2 motors per side. It is a close thing but not out of the bounds (especially if you recall that I discussed acceleration as essential a stall condition for the motors in an earlier part of this thread -- this is why you will likely have less than the calculated times to trip at the end of the match even if you did not get in any pushing fights during the earlier part of ther match).
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.
That's my story and I am sticking to it...
Joe J.