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HomeAircraftHelicopterMain Discussion › Motor Efficiency
08-07-2011 02:53 PM  6 years agoPost 21
BobOD

rrElite Veteran

New York- USA

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a motor gets hot because it's in contact with hot windings
There's more to it actually. There's also induction heating of the stator...magnetic losses. Probably more than the resistive losses in the windings but that depends on operating conditions.

Also, one of the things that makes it difficult to know what you're going to get is the fact that the 90% eff. rating (for example) is based on a particular set of conditions. But, a heli never runs at that one condition. The actual eff., I suspect, is dramatically lower at times.

It seems the best thing is to look at what others have and decide from that. Of course, if you're looking to stand out, you're probably just going to have to spend some dough.

Team POP Secret

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08-07-2011 06:56 PM  6 years agoPost 22
Terrabit

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Seattle, WA - USA

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I usually recommend that people first choose a headspeed that suits their flying style. Some require hypersonic ballistic headspeeds while others like myself are more moderate. Then pick a motor in the appropriate kv range that best represents the ideal compromise between weight, performance and price for them. MrMel's headspeed calculators are very useful in this endeavor. Then choose the esc based on the motor selection. Most folks, it seems, eventually settle on brands that they are familiar with or have had good luck with. It comes down to personal preference.

Scorpion motors have served me well. I know they are not the best but the dozen or so that I've had have been solid performers, particularly the LE versions. Kontronik motors, if you can stomach the price, are very high quality motors. Not the most powerful but very efficient, light and well made. I've also had good luck with Neu motors. They are generally high quality and efficient but not very light. Lots of folks like Xera motors. Have not tried one yet myself but hear they are good also. Choices are good.

I shaved roughly 120g (4.3oz) off of my 700E by swapping out the stock power system for a Pyro/Jive combo. I'm pretty stoked about that. My 700E weighs less than eleven pounds with 12s 5300's. And I'm getting seven minute flights at 1950.

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08-07-2011 07:49 PM  6 years agoPost 23
robv

rrApprentice

SoCal

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I usually recommend that people first choose a headspeed that suits their flying style. Some require hypersonic ballistic headspeeds while others like myself are more moderate. Then pick a motor in the appropriate kv range that best represents the ideal compromise between weight, performance and price for them. MrMel's headspeed calculators are very useful in this endeavor. Then choose the esc based on the motor selection. Most folks, it seems, eventually settle on brands that they are familiar with or have had good luck with. It comes down to personal preference.
+1

helixangle,

The minimal modification is to make the 4025-630 fit. It requires cutting into the frame a little bit. It sounds a little complicated but really it's an easy job. It took me about 10 minutes to do. 2650mah 40C.

IMHO, 12S setups on 550/600 helis are "smarter" setups. Just my opinion.

Team JR | Gens Ace | YS Engines | Scorpion Motors | Pure Tech

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08-08-2011 01:03 AM  6 years agoPost 24
helixangle

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Mamaroneck, NY - USA

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@ rob and Tera...

You guys are awesome, thanks. I have been looking for someone to answer this question in the way you guys did.

Thanks again for the help, now I at least have a direction to go in

Be sure the juice is worth the sqweeze
Remember life is hard...even harder for stupid people

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