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The rule says around a single vertical axis, but last year when my team was at state we saw a group with a tandem/chinook style helicopter. I was wondering if this is legal according to the 2914 rules, though I also see that it is still phrased th...

Chinook style helicopters are still legal under the 2014 rules, but will not receive any bonus. 3e defines a rotor as a blade or blades which rotate around a vertical axis. Each rotor may have it's own vertical axis.