Quote:
Originally Posted by AdamHeard
I think this is largely a function of how concentric the hub is. We went a little overbaord on our hubs and they are pretty darn concentric. I saw a few teams running wheels that had the slightest amount of runout and that really was noticeable audibly.
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I think we would have noticed if our wheel wasn't concentric. Our shooter ran very smoothly without much noise.
I think the reason these wheels fail is largely a function of time. When prototyping we ran a 4" 1:1 off a 550 for a few seconds and the wheel was fine.
Every we shot our wheel would expand considerably, and the stress of the repeated expansion coupled with how fast we were running the wheel was what caused it to fail. Like I said the failure is a function of time, not just speed.
I believe the urethane wheels are bound to fail at some point when run at FRC speeds. There's no magic rpm that they fail at, it's just a question of how long you want them to last. If you run them at 10,000 rpm or slower they'll probably last a season, anything faster and you're pushing your luck.