i am using a scorpion 1400kv heli outrunner, its rated at 1600W if i remember correctly. running on 6 cells though, only about the same size as a 540 can motor. it goes really well and it feels very powerful yet smooth to drive. faster accelleration than my caster engined car and about the same top speed, i do suspect i could gear it up though as it isnt getting too hot and the speedo is barely warm after 20 mins. ran it on local track for duration, cut out was 36 mins on 4500 6 cell lipo. have a look at some of the heli inrunners on giantcod, some interesting ones on there, was tempted to try one but the outrunner is plenty good enough for me
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