while the RS pro will take any brushless motor out there when you start running <=5.5's they start to get a bit warm. I had mine thermal on a hot (for the UK 25oC) day running only a 6.5. It'll power my SP v3 5.5 to finish a 7 min final, but it gets very hot with 6 or 7 LEDS lit up so doubtful it'd last much more.
I had to gear it down to a measly 19t pinion to do that. on a 20t it was too much for our grass track.
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