| Kevin Sevcik |
12-01-2017 14:06 |
Re: Realistic high goal scoring rate
Quote:
Originally Posted by Chris is me
(Post 1630026)
This isn't 2016 - volume and accuracy are tradeoffs where the right answer very well may be on the side of volume. Turreted shooter in 2009 could be more accurate than dumpers, but dumpers certainly were the more dominant design in general that year. This year's game has five times as many game pieces as 2009!
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I am in complete agreement with this, actually. The important shooter metric is balls scored per second, not accuracy or balls fired per second. Erring on the side of volume is almost certainly preferred because it's probably easier to increase accuracy for a high volume system than to increase volume for a high accuracy system. I think it IS interesting that if you're pursuing a single stream shooter*, at some point you have to start backing away from the goal to increase your rate of fire without running balls into each other.
*How long do you think until the first joke about crossing the streams?
Quote:
Originally Posted by Chris is me
(Post 1630069)
I don't think that's how it works. The motor is only at max power spinning half its free speed at full voltage, IE if the load the motor is under is slowing it down that much. If you're just spinning the motor at half its free speed with speed control, you're just applying a bit more than 6 volts to the motor (a bit more to account for friction losses etc). You definitely do want to be spinning a flywheel at less than 100% speed so it has some headroom to recover with, but I don't think it's exactly half voltage or half free speed either.
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Like I said, I need to revisit my spreadsheet to better account for this. But two things are true about my statement:
1. If your wheel slows down by x% per ball, the fastest way to spin it back up to target speed is at at the peak mechanical power point. (Physics, that) And the peak power is at 12V and 50% free speed.
2. Peak power is the MOST power you'll ever get out of the motor. That's 337W for a single CIM. If it takes 33J to fire a ball, the most balls you can fire without slowing down is 10 balls per second. And that's going to be with the motor running at 1/2 free speed. If the motor's running any faster, it won't put enough energy back into the system and the wheel will slow until energy out = energy in. |
