Quote:
Originally Posted by EricH
The inspectors will be looking for both. One piece of prop shrapnel gets through, and <S01> is probably going to be called. Then you have to remove both.
Let's say those are 9" blades going at 7000 RPM. That's C=pi*d=pi*9=28.26" per revolution. That's about a 2' circumference (rounded down to emphasize the need for protection here). So, the tips of that prop are traveling at 7000RPM=116.7RPS over a 2' circle. That's a tangential speed of 233.3 feet per second--or about 4 FRC fields in one second. If a tip breaks off at that speed, you WILL get a safety violation if it leaves the robot! And, if I were the head ref, I'd make you either remove the props or add protection to the cage. Play it safe and add material now.
Edit: I just saw this: http://www.chiefdelphi.com/forums/sh...049#post812049
I would consider this, or something similar, much safer than your current setup. |
The propellers are perfectly safe as long as they don't exceed their maximum rpm, the rate at which we are spinning them is no where near their maximum rpm (the maximum is about 13k rpm). Having them spontaneously exploding is not a huge concern to us, having balls getting in the way of the props is a much bigger concern. (oh and its 12.25 in in diameter btw ;D)