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Electric Stunt => Gettin all AMP'ed up! => Topic started by: John KruziK on December 03, 2012, 05:16:41 PM
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i read an article in the Jan2012 CLW about turnigy motors. After doing a little research, i found they have a line of direct replacement motors sized like glow engines. My question is they have two .32 replacements, 1 is 770kv and 1is 600kv. Whats the difference? thanks
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Hi John
Turnigy, Rimfire and E-Flite (probably others) have all tried rating their motors directly with glow - problem is the match-ups are all wrong. Note that the Turnigy G32 data includes test data with 14" and 15" props - no IC ".32" on the planet could turn those props.
If you are really looking for a 32 equivalent (something that will turn a 10" prop?) consider a Turnigy 35-36, Eflite Power 15, AXI 2814, Scorpion 3014 or Arrowind 2815 - or countless others of similar size right around 4 oz. You should also be looking for a kv somewhere between 850-950 that will run on 4 cells.
BTW the kv rating is the expected revs the motor will turn per volt input. In practical terms the kv=770 will work well with a 5 cell pack, the kv-600 will work well with a 6 cell lipo.
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Thanks Dennis, I was on hobbyking site. They have turnigy 35-36 9 kv 910 375watts and their g15 950kv 500w. It's for an Ares. I know brodak also has electric, just dont know if Arrowind is any better than turnigy.
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Note that the Turnigy G32 data includes test data with 14" and 15" props - no IC ".32" on the planet could turn those props.
Dennis: http://www.modelenginenews.org/sparey/five.html (http://www.modelenginenews.org/sparey/five.html). 5cc, 16 inch prop. Neener.
John: The difference in Kv is basically the difference in how fast they'll spin at a particular voltage, or if you turn that upside down, how much voltage they'll need to spin at a certain speed. If 850-950 RPM/volt is right for four cells, then 770 RPM/volt means you'll probably need five cells, and 600 RPM/volt means you'll probably need six (!).