ORIGINAL: nitrosportsandrunner
1st, how can you have a xl-5 rusty with a 12t motor? did you use a different esc? cause the xl5 esc can only handle down to 15turns.
2nd, the sidwinder with 3s would be very fast. but really, all the RTR brushless motors will blow your mind on 3s. even the hottest brushed motors dont compare.
you can multiply the #KV by the # of volts.....5700kv X 11.1=63270. so, with no load on the motor it will spin at 63270 RPMs.
the xl5 comes stock with a 12t motor, but 550 size in a 540 size it only goes down to 15t (so the guy is pushing his ESC way too hard)
also, the sidewinder with 3S is not an approved combo, too many amps for the esc to handle on the 5700