0rickharris 3 months ago ReplyUpvoteIF this worked, Then the system has been very unreliable and erratic over the past week or so..Now my REAL question that I asked a week ago.My electric racing car had a 250 watt DC motor that weighed around 4 or 5 Kg.Now this motor claims to be 4 K watts. https://hobbyking.com/en_us/turnigy-c580l-580kv-brushless-inrunner-motor-4000w.htmlOther than electric bikes I seen lightweight cars or velomobiles using such a motor why not. Am I missing something. The RPM will be very high but a suitable gear box isn't beyond engineering.So why are they not in common use? $000 watts is 4000 watts in my book. (about 5.5 HP)Expert opinion?