Capt Kremen Posted December 23, 2018 Share Posted December 23, 2018 I have a balsa/ply 'AcroWot' (Mk2?) fitted with a Hobby King SK3 Aerodrive 4250 500kv brushless motor. After a while 'resting' in my hangar, I'm dusting it down during the hols, in readiness for resuming flights with it. As is often the case, the HK web page for this motor is scant on best prop. (I had previously flown this model on 5S and a cautious 14x6). Having reconfigured the flight battery access to a 'top hatch', I can now easily fit a 6S LiPo. So anyone out there using this motor? If so, with what Cell Number & Prop Combinations or could you run data thru a e-calc programme to suggest best props. I reckon on using 5 and 6 cell LiPo packs. I have a 100A ESC fitted so plenty of headroom to cope with current draw and some in reserve. Thanks for any practical suggestions AND Compliments of the season to all. Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted December 23, 2018 Share Posted December 23, 2018 E-calc says that on 6S using a 13*8 you will draw 48A for around 1KW, that's getting near the motor's limit. A 14*7 shows as 60A and 1250W. IIRC my Wot'sWot currently has a similar motor running a 13*8 on 6S, not unlimited vertical but plenty of power for me. Quote Link to comment Share on other sites More sharing options...
Kevin Mander 1 Posted December 23, 2018 Share Posted December 23, 2018 I have one in a Phoenix Typhoon pattern type model, running 6s on a 12 x 8 apc seems just about right to me, plenty of power and no sign of running hot. Quote Link to comment Share on other sites More sharing options...
John Dennier Posted December 24, 2018 Share Posted December 24, 2018 HK posted spec for this motor is maxed at 57 amps. Use a watt meter to check your amp draw with a selection of props and batteries up to 5s until you find a comfortable arrangement. Minor short term exceedences from a fully charged battery probably won't hurt . Note that the voltage spec quotes 19 volts max Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted December 24, 2018 Share Posted December 24, 2018 Interesting as it also states 1350W, at 57A max that comes to 23v or 6S so there's some confusion there: Specs. Turns: 10T Voltage: 4~5S Lipoly RPM/V: 500KV Internal resistance: 0.018 Ohm Max Loading: 57A Max Power: 1350W Shaft Dia: 5.0mm Bolt holes: 25mm Bolt thread: M3 Weight: 269g Motor Plug: 3.5mm Bullet Connector Quote Link to comment Share on other sites More sharing options...
PatMc Posted December 24, 2018 Share Posted December 24, 2018 Max voltage is meaningless for a motor, max current is the limiting factor. Quote Link to comment Share on other sites More sharing options...
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