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Old Oct 10, 2012, 09:58 AM
itsme2 is offline
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Hobby King Premium Outrunner Motors - Worth It?


Is there anything superior or special about this series of HK motors: http://www.hobbyking.com/hobbyking/s...ner_Motor.html ??

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Old Oct 10, 2012, 12:05 PM
jackerbes is offline
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Jack
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Idon't own one and don't know for sure but I'd be surprised to find them much better than most motors. Some of the things they say about it are just plain silly.

A "string wound stator?" Give me a break, the use of lacings to keep stator windings from coming in contact with magnets is not uncommon.

"Double shielded bearings?" Virtually every motor sold anywhere in the world has double shielded bearings.

"..We instructed the engineers to source the best quality magnets, bearings and materials available to them and develop a motor that would not only rival, but surpass the quality of many leading motor manufactures on the market today..."

That is nothing more than absolutely unsubstantiated babbling from the advertising copy writers in the hopes of increasing sales at higher prices. If all of those things are better quality, tell me the makes and models of the bearings, magnets, and other bits and pieces. What are the N rating and termperature ratings on the magnets? What class are the bearing? Who made the bearings? Etc.,etc...

They say it is a 505W motor (not 550W as I said originally), I'm willing to bet that it would only last a short time at that power level. That is a peak reading and should be qualified as such in the advertising.

Jack
Last edited by jackerbes; Oct 10, 2012 at 05:38 PM. Reason: Correct the watt figure...
Old Oct 10, 2012, 12:20 PM
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It's like how they said that the Nano-Tech batteries had some new chemistry that made them better than all the rest... I've yet to see that claim proven.

And I do think that 505W is a peak number... I'd bet about 310W continuous from that thing.
Old Oct 10, 2012, 08:19 PM
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I have about four now and they are all perfectly balanced and have stood up well to crashes ie no loose magnets. These have been issues on some other HK motors I have owned. Power is about the same as other good HK motors but not as good as those 500% the price.
Old Oct 11, 2012, 12:55 AM
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see this

https://www.rcgroups.com/forums/show...postcount=4169

I also had one break in the same way...I don't recommend for 3d flight
Old Oct 11, 2012, 01:24 AM
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The cost of the parts to make a motor is the major determining factor for the retail price. The magnets, wire and bearings are purchased from outside company's. There is no low cost motor that can have top quality parts. Especially the magnets, as there are only two company's in the world that make top notch magnets so there is no getting around that cost. Being that a majority of electric motors are made in China and the government sets the wages I don't see labor costs being a significant factor in the difference in price between a (ie) Scorpion and and HK motor.
Last edited by zeroback; Oct 12, 2012 at 03:07 AM.
Old Oct 11, 2012, 01:45 AM
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In the picture you can clearly see the small-gauge spaghetti-bowl windings. I'd say there's nothing special about that motor.

That being said, I also don't see anything wrong with the stated power. The max current rating is 34A which isn't all that crazy for a 110g, 1050Kv motor. If we assume the battery is a 4S pack dropping to 15V under load, that's 510W right there. Either way, I could run it on 6S and hit 505W at just 22A, which would certainly be well within its useful capabilites.

How long will it be before people realize that the watt number alone is almost meaningless?
Old Oct 11, 2012, 07:51 AM
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Jack
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As far as I know HK does not manufacture motors even though the advertising babble there implies otherwise. And there are technical details to explain why the motor might be better.

Here is a better explanation of a motor design process and it has the specifics that explain why Scorpion motors are better than many other motors:

https://www.rcgroups.com/forums/show...0&postcount=35

At the end of that it is easy to understand why a comparably sized Scorpion motor would have a MSRP that is about three times as high. The Scorpion motor would also have higher continuous and peak power ratings.

That post also goes into an explanation of how motors work and explains motor efficiency. HK is not trying to explain anything to that level of detail but if they used designators or specific brands and grades to identify magnets, wire, and bearings they would be more believable. They would serve themselves well to mention some more specific details in the advertising copy if they want to overcome their long history of misrepresenting the qualities of their products. I am skeptical as to anything they say. .

Jack
Old Oct 11, 2012, 02:09 PM
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Ahem.. 'the above linked' reads like nothing more than Brochure Babble.
Those may be good motors.
But they have shown to benefit from a rewind and decent bearings.
Surprising to me at least..in view of their current price points.
Certainly my Lehners need neither albeit Inrunners, consequently beyond my meager skills to do so, in any event.
Smoke and mirrors seems a recurring rascal.
Old Oct 11, 2012, 04:22 PM
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Quote:
As far as I know HK does not manufacture motors even though the advertising babble there implies otherwise.
HobbyKing is the storefront for HexTronik LTD, which is the company doing the designing and manufacturing. Turnigy is their biggest brand.
Old Oct 12, 2012, 03:16 AM
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Imagine if Hextronic LTD existed in the environment that allowed Sony to be created. There really would be low cost high quality motors.
Old Oct 12, 2012, 03:27 PM
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Quote:
Originally Posted by jackerbes View Post
As far as I know HK does not manufacture motors even though the advertising babble there implies otherwise. And there are technical details to explain why the motor might be better.

Here is a better explanation of a motor design process and it has the specifics that explain why Scorpion motors are better than many other motors:

https://www.rcgroups.com/forums/show...0&postcount=35

At the end of that it is easy to understand why a comparably sized Scorpion motor would have a MSRP that is about three times as high. The Scorpion motor would also have higher continuous and peak power ratings.

That post also goes into an explanation of how motors work and explains motor efficiency. HK is not trying to explain anything to that level of detail but if they used designators or specific brands and grades to identify magnets, wire, and bearings they would be more believable. They would serve themselves well to mention some more specific details in the advertising copy if they want to overcome their long history of misrepresenting the qualities of their products. I am skeptical as to anything they say. .

Jack
Jack,

Thank you for the dissertation on the brushless motors! I really appreciated your post and even though it will take me several rereads to grasp all of that data, it is nice to see real science instead of technobabble. Would you comment on the Japanese competitor who has an internal fan on the armature. Is this an attempt to use cheaper magnets? It seems that if the armature fan is taking some of the available output power, less is going to the propeller.

Ron
Old Oct 12, 2012, 06:17 PM
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real science minus the bearings.
Old Oct 12, 2012, 11:39 PM
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Jack
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Quote:
Originally Posted by doublebuck View Post
Jack,

Thank you for the dissertation on the brushless motors! I really appreciated your post and even though it will take me several rereads to grasp all of that data, it is nice to see real science instead of technobabble. Would you comment on the Japanese competitor who has an internal fan on the armature. Is this an attempt to use cheaper magnets? It seems that if the armature fan is taking some of the available output power, less is going to the propeller.

Ron
I think I know the motor your mean. I don't own any or them nor do i own any Scorpion or higher end than that motors. I don't want to present myself as someone with a great depth of experience and knowledge. More just another guy with an opinion on the question asked.

As for the fan, it if works, I guess it works. In theory I guess it could break even. It consumes a little power but also improves the cooling which prevents some power losses. So maybe it breaks even in the end.

I don't like getting motors hot in use so I tend to over power and fly at less than full throttle except for occasional moments here and there...

Jack
Old Oct 13, 2012, 11:49 PM
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Originally Posted by jackerbes View Post

"..We instructed the engineers to source the best quality magnets, bearings and materials available to them and develop a motor that would not only rival, but surpass the quality of many leading motor manufactures on the market today..."

Jack
That is what they instructed them to do, but knowing HK i bet they didnt


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