ORIGINAL: Druss
in RC helis, micros refer to 300 size helis and smaller. Minis are 450. 300 size electric helis are still about 18" long though.
by what rules? wattflyer calls the 450 class/325mm blade helis as 'standard' size, and doesn't list them with the mini. I feel anything under a 550mm blade is pretty small.......