I’ve got an idea Mike. You add the second rotor assembly and a heat sink or two to your rotating mass and see how she pulls off the bottom and how she stops with all that rotating weight. (You would even clearly be able to tell while its on the still on the stand!) It’s going to be like watching an elecrtic grinder wind down. Being a pilot too, doesn’t sound like such a safety bonus to me. Try increasing the rotating weight of your prop by that percentage) Dual rear rotor / caliper assembly’s are allowed in several sanctioning bodies and I’ve never seen it run by anyone? Has anyone else? Hum, wonder why.
Doug is on his way back from the kart expo as is Brad and the weather has not been to favorable. But yes ask him what a couple of rotors and heat sinks will do (if anything) to the kart.