Pnumatic bumper

[Woolly]

Originally Posted by dcarr

You probably have a bit of rule-reading to do

Defense is okay, and very important but an appendage specifically designed to cause damage to other bots doesn't align well with the rules.

Indeed. Though, what if you had an extendable wall made with bumper-like construction that you could use to play lead-blocker to allow offensive robots to get to scoring/feeding positions without harassment.
It's not intended to damage robots, it's intended to shove them out of the way. You might even be able to have it actuate out at an angle so that you can push them off to one side.
Granted, you would need a drivetrain with lots of torque and the ability to go fast (WCP/Vex Pro Shifters anyone?) but if that's all you're doing, why not?