Kontronik motors

[tonystevens]

Where's Ben ? I know your slightly biased but would still like to hear your view

Hes a bit busy with his new toy i imagine lol

[jimmyhorns]

Jimmyhorns , have you stripped out a Helidrive turnigy motor ? If yep , how does it compare to the said spoken already motors please ?

Like this one?...

20140502_213602.jpg

[ady]

Like this one?...

[ATTACH=CONFIG]73445[/ATTACH]

Thats the one

[jimmyhorns]

Once you take it apart, its certainly an inferior product when you compare it to the likes of kontronic/scorpion e.t.c.

In stock form then windings were pretty shoddy in terms of their regularity, and in fact one tooth was wound incorrectly from the factory, which probably explained why the previous owner had a couple of issues with it.... The winding density I would describe as moderate. I should be able to increase the cross sectional area with a re-wind by about 80%

The can itself is reasonably well made in terms of construction, and the magnets seem to be appropriately sized though I havent been able to find a reliable way of testing the magnetic field density without removing them (and likely destroying them in the process). I havent yet tested its balance, but efforts have been made to balance the can from the factory which is a good start.

The bearing arrangement is a little odd, as they have two very thin bearings on top of each other at the end of the stator holder (the bearing you dont see from the outside).


I think they will make a good motor to rewind and get pretty serious performance out of for not much money. I have been looking at buying a few of these and then selling them off in re-wound form, but HK are not playing ball with a reasonable price at the moment.

In stock form I think they represent a pretty good buy for the money, provided of course that the dodgy winding was a one off, but I wouldnt expect miracles from it either.

As for re-wound form, I will let you know

[jimmyhorns]

Oh, and I still owe Trillian for it

[ady]

Awesome cheers dude . I look forward to hearing how the tweaks go , I have a 530 kv which upsets my 700 if I wind it up , thanks again , ady

[Jez N]

I guess an interesting question for Jimmy is how much better do you reckon your re-winding service makes a standard scorpion motor? Can you comment on how they compare to an equivalent kontronik motor? Obviously you have to try to be unbiased.

[Jamin_00]

Everything on the Kontronik motor is made in house so the quality of it all can be controlled. All except the hardening of the shaft. The whole shebang

The design of the motor can also aids in better cooling than others as heat is off course lost energy. The copper used on the windings is a higher % copper base than others. There are many types of copper you can buy. The internal resistance is typically lower and even more so with the competition range. Effiency is unrivalled and I don't think you see ANY other brand quote their effieicny ratings. Most Kontroniks are greater than 90%. A few % difference here when you are talking of a 3.5kw and much more power motor is a lot in efficiency. Power is not everything, the 700 and the 4035 are still more powerful than a 120 engine and yet everyone raves about them

Also, run one of these motors for years and 100's and 100's of flights and it will still be as good.


Jez is correct, I have not run a different brand motor for a long time, I have always run Kontroniks 99% of the time after Gareth told me there was no comparing others even before any involvment. Oh wait, I had a 4535 in Spunky for a little while but then swapped it for a 750-50 Comp and the logs did not show much noticeable difference. Spikes where lower showing it was working not as hard but it is a bigger stator of course but other than that no drop in speed.

Other brands get hot not just because of the power as if you take 2 that are the same power output motors, Kontroniks will always be cooler. And to pick up on something Georges said on Rotors where he had a dig at them indirectly by saying about Kontronik always go on about industrial and professional quality, 50% of Kontroniks business is in industry beleive it or not so they have a wealth of knowledge here also and this is why reliability is so important and why they are so reliable.

Its like anything, quality comes at a price and you either go for it or you don't. You do not have to as every thing else out there will suffice but people like a choice and want a choice. Some spend the money, some don't can't justify it, can't afford it etc, whatever the reason but to dismiss something based on the wrong reasons is well, just that wrong For some reason we are power crazed at the moment with electric motors but there is no need to be.

People are still running the Pyro 30-12, which was replaced by the 700-52 and they are fine and without issue



Horses for courses, you might drive a ford or a BMW, take your pick but at the end of the day its great that there is such choice. Now, back to the Mostro and my JD

[trillian]

i ran a hacker in the converted sceadu
the motor was trouble free

I have run a couple Hackers and have one now that's working very well and runs cool and very smooth.

[ChrisB]

Ive have Hacker motors in planes and rate them very highly and they were highly recommended to me.

Just so happens,lots of info to confirm,that Helidrives are made in the same factory to same spec as Hacker.its interesting to read about the internals and construction and justification of materials used but what im interested in is price,ability to plug it in,go fly my heli,make plenty of power,be efficient and come down cool,on the face of it my Helidrive matches all my other motors Align,scorpion(spit),and Kontronik.

An example post from rcgroups

Hacker motors are identical with Turnigy SK3 motors
You may remember the "Turnigy SK3 HeliDrive Competition Series 4962 motor", that we mentioned back in post #210 of this thread. This motor is used for a 700-size (90-size) helicopter. HobbyKing Page not found.

I noticed tonight, that this motor is essentially identical with the "Hacker A50-10L Turnado" heli motor, in appearance (apart from the front housing) and in all specification - http://www.hacker-motor-shop.com/e-v...&t=3&c=31&p=31 -Both motors even have the same "ribbed" outer surface (see the pictures below).

Specs: Turnigy SK3 4962-560kv: weight 448g; Kv 560; 10 turn; 10pole; Diam 49mm Length 62mm;
Hacker A50-10L Turnado: weight 455g; Kv 580; 10 turn; 10pole; Diam 49mm Length 62mm;

It is, of course, quite certain that they are the same motor, and that they are both of course manufactured by the SunRay Technology factory.
The very big difference is that the Hacker Turnado motor costs 189 Euros ( = $251), whereas the Turnigy SK3 motor costs $74.
The Hacker motor costs 3.4 times as much as the Turnigy SK3 motor. Or: The Turnigy SK3 motor costs just 29% of the cost of the Hacker Turnado motor -and all for a basically identical motor ....
ImagesView all Images in thread
Views: 72

Hacker A50-10L Turnado, front view Views: 68

Hacker A50-10L Turnado, back view Views: 114

Turnigy HeliDrive SK3 4962, front view Views: 146

Turnigy HeliDrive SK3 4962, back view

[mahbouni]

Just thought I'd add my little bit.

Whatever efficiency your motor has, I bet it's not that efficient when the temperature of the windings are over 100C.

If you've ever wondered why the bearings don't last long, it's because they get so hot. I have Pyro 600-11 in my Logo 480 with over 300 flights on it an I've never oiled the bearings. They're still good for another 200 flights at least.

If you compare a standard Pyro to another motor of same class, you will find that the Pyro offers more power yet weighs less. For example the Pyro 650 is a 3KW motor, yet it weighs only 275g. Try finding another motor that punches so far above it's own weight. When you run a lighter and more efficient motor, you don't need such a heavy ESC or LiPos to power it. The whole model becomes lighter and more efficient. Can you believe this guy is 3D'ing a 700 size machine with a 275g motor?

[Jamin_00]

And here is the log he sent me from it as I thought it was a typo.

When I asked why he was running that motor his answer was that all other motors deliver much more power that he simply does not need as most of it is wasted. They are too heavy also.

Here a pic of the log. You can see its not being over worked due to it being small and it handles it amazingly well.

[ChrisB]

Oh the irony is almost laughable,just come back from flying my E700 seeing what the Vortex is like and the last flight was cut short because the Helidrive motor blew itself to pieces.

Heli OK though but just wondering whether to risk another,i think there is only one sane answer to that.

[Jamin_00]

The other week I was saying about not crashing etc then I piled the Agile in lol.

Best to keep quiet about these things I reckon


But what caused it, any idea?

[Johnda]

just wondering whether to risk another,i think there is only one sane answer to that.

yep, you're right http://www.rcheliaddict.co.uk/sale/1...-52-motor.html