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Old 09-17-2008, 05:44 PM   #11
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Re: Translate into English please

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Originally Posted by mtnflyer View Post
Gee, I'm a Journeyman Electrician, and I don't know what a 5000 KV motor for hobby use is.
I work with 260 KV every day; and that's 260 thousand volts AC.

As an electrician, I'm not sure how they class small hobby electric motors. But, from what I read, neither do'es anyone else.

You ask a good question? How can the average Joe tell what is mean"t by the manufacturers sale specifications.

I'm a journeyman electrician, and I don't know.
Don't confuse kV with KV!
kV is kiloVolts - KV is Voltage times (K)onstant
Unloaded RPM is expressed in KV, so 5000 KV times 10 Volts would be 50000 RPM (approx. you have to figure in drag, efficiency...)
I'm a technologist.
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Old 09-19-2008, 08:12 AM   #12
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Re: Translate into English please

Eflite and Maxxpro have good glow to electric conversions similar to the GWS system. For instance the Mini Funtana may weigh 12 oz ready to fly and is a 3D plane. To handle that weight and 3D you have to go down to a 2808 model. Says equivalent to an .061 motor, which is moot as there's no reference to that anywhere, but does work when you want to pick a motor for a 40 size plane. I used that to pick a motor for a Twist 3D. But says it will carry 9 to12 oz. in 3D flight. If you want to swing a big prop with lots of pulling power, go for the low KV but watch out for prop to ground clearance. If you want lots of speed, go for the high KV which swings a small prop at high RPM but you need to watch out for flutter. I usually go for the middle of the rd. if you have three to choose from. Prop says 8-4 to 11-5. This is where you pick the prop in relation to the batt your going to use. If you were to use the 11-5 on a three cell batt, you would likely draw to many amps and toast the motor but on 2 cells it would work fine. Just the opposite when running an 8-4 on 2 cells. You wouldn't be getting the full potential out of the motor. Like driving in 3rd gear with a 4 speed transmission. This is where a wattmeter is a necessity. to get the most out of your motor.ESC and batt. An ESC only needs to be capable of higher amp rating than the motor specs call for.
Hope this helps a bit.
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