wallace.tharp

Re post 117, in reply to the good Dr: Why the Hacker at 3 times the price? Why do people drive the Benz & BMW? Kind of joking, but, of my 5 or so electrics, the 3 Hackers have never missed a lick except when I bounced my P A Extra 260 off the ground in a close to the ground inverted flat spin "brown out," at least I think it was a Brown Out. I say that beacaus I am not unable to "dumb thumb" it once in a while. When I flew for Continental RPV's from 2000 to 2003 the first thing we would say when a new guy crashed one of our 78 pound UAVs was, "you dumb thumbed it." At which time he would have to convince us that he did not. I digress. The Hackers run beautifuly and they are beautiful...I love the purple...kind of like the beauty of the BMW or Benz. The final decider of the purchase of my Hacker 60L wa that it was offered to me by a club member that had accidently shorted it out by atempting to plug in the Deans reversed fasn smoked it band new. Hacker rewound it and I bought it for $120 with 4 props including one Vox. What a deal aye?? Great info here. I am learning a lot. Thanks a lot! wallace.tharp

DrMotor

HYPERION-Z MOTORS -FANTASTIC BARGAINS AVAILABLE
Was just looking at the Aircraft World website, and there are some really terrific bargains available there on Hyperion-Z motors
See: http://www.aircraft-world.com/shopdi...que+outrunners

-Of course, all Hyperion-Z motors are made in the Sunray factory along with E-F Torque, LiPolice, Shulman Aviation FURY, Gens Ace, Turnigy SK3 motors etc etc etc .... And Hyperion-Z motors are totally identical to Hacker motors, apart from the fact Hyperion are blue, whilst Hacker are purple ...

In many cases, as you can see below, the totally identical Hyperion motor is less than one third the price of the very same Hacker motor. (All prices converted to $ )

HYPERION Z5025 24T 200 KV IS EXACTLY THE SAME MOTOR AS Hacker A60-24 S V2, Kv 195
HYPERION Z5025 22T 215 KV IS EXACTLY THE SAME MOTOR AS Hacker A60-22 S V2,Kv 217
HYPERION Z5025 20T 235 KV IS EXACTLY THE SAME MOTOR AS Hacker A60-20 S V2,Kv 245
-The HYPERION Z5025 motors are all $95.90; The Hacker A60- S motors are all $299.15

Hyperion Z5035-20, 20T, 170Kv $103.10 IS EXACTLY THE SAME MOTOR AS Hacker A60-20 M,Kv 170 $327.32

HYPERION Z4035 14T 299 KV IS EXACTLY THE SAME MOTOR AS Hacker A50-14 L V2,Kv 300
HYPERION Z4035 12T 343 KV IS EXACTLY THE SAME MOTOR AS Hacker A50-12 L V2,Kv 345
-The HYPERION Z4035 motors are $75.80; The Hacker A50- L motors are $215.72

HYPERION Z4020 14T 574 KV $58.80 IS EXACTLY THE SAME MOTOR AS Hacker A50-14 XS V2, Kv 564 $161.68

HYPERION Z4025 16T 368 Kv $65.80 IS EXACTLY THE SAME MOTOR AS Hacker A50-16 S V2,Kv 378 $174.61

The prices for Hacker motors are taken from West London Models - http://www.westlondonmodels.com/Electric/Motors/
However, the price of Hacker motors areTHE SAME ALL OVER EUROPE -e.g. Modellbau Lindinger has almost exactly same prices for Hacker as West London Models. And in some European countries, prices for Hacker are even more expensive than these ....!
http://shop.lindinger.at/products_fi...sort=4a&page=5

As you see, forALL these motors above,the price of the totally identicalHyperion-Z motor is lessthan one third of the very same Hacker motor.
How can we possibly explain this ....?

-Hyperion-Z motors have the reputation of beingevery bit as good as Hacker ( -and this makes sense, they are exactly the same motors ...!)

DrMotor

MORE ON HYPERION MOTORS:
-A few more Hyperion-Z motors at Aircraft World, showing their prices:

HYPERION Z3025-8T 985 KV $66.39 IS EXACTLY THE SAME MOTOR AS Hacker A30-8 XL V2, Kv 1000 $112.49

HYPERION Z3019-14T 800 KV $59.96 IS EXACTLY THE SAME MOTOR AS Hacker A30-14 L V2, Kv 800 $100.78

HYPERION Z3019-12T 900 KV (Kv actually ~1000) $59.96 IS EXACTLY THE SAME MOTOR AS Hacker A30-12 L V2, Kv 1000 $100.78

HYPERION Z2205-34T, Kv1530 $37.56 IS EXACTLY THE SAME MOTOR AS Hacker A20-34 S EVO, Kv 1500 $57.83

-As you see, the price of the totally identical Hyperion-Z motor is about half of the very same Hacker motor.

DrMotor

I RECEIVED THIS MESSAGE FROM rosnik:
HERE IS MY REPLY TO rosnik:
Hacker A50-14 XS V2, Kv 564 -£106.20 - http://www.westlondonmodels.com/Elec...r-A50-14XS.asp

IS EXACTLY SAME MOTOR AS: Gens ACE Mars 4841-550KV, 14T -62.77 € =£52.92 - http://www.gensace.com/epages/genspo...s-BL4841-550KV

ALSO EXACTLY SAME MOTOR AS: LiPolice LP-4020 /14T-550KV -49.90 € from Schweighofer =£42.07 - http://www.der-schweighofer.at/en/pr...4020_14t-550kv

ALSO EXACTLY SAME MOTOR AS:
Torque 4014T/570 Kv 570
HYPERION Z4020 14T 574 KV-This is only $58.80 (=£38.62) from Aircraft World - http://www.aircraft-world.com/shopexd.asp?id=5594
Foxy C4020/14 550 Kv
Lipotech GTA4510 -14 575 Kv, 14T
also same as BOOST 50 Kv 600

IT IS QUITE AMAZING: THE IDENTICALHYPERION-Z, GENS ACE AND LIPOLICE MOTORS ARE MUCHLESS THAN HALF COST OF THE VERY SAME HACKER ...

DrMotor

Wallace, thanks very much indeed for posting. Please DO continue to contribute. I also hope that many other people will contribute.

I hear what you are saying, Wallace, about Hacker motors. BUT: The real point is that Hacker motors are EXACTLY the same, made with all the same identical parts, in the same Sunray factory, as: E-F Torque, Hyperion-Z; Shulman Aviation FURY, Gens Ace, Common-Sense-RC, LiPolice -and all the other "Sunraybrands"

I have tested on my Motor Thrust Stand: HACKER A10-9 L vs TURNIGY SK3 2122-1570Kv vs GENS ACE 2122-1580Kv
-They gave TOTALLY identical results, with currents for each prop almost identical, and thrust within 10g of each other ...
-It is clear that they are underneath, the very same motor ...

I have also tested on my Motor Thrust Stand: HACKER A20-22 L, 924Kv vs TURNIGY SK3 2830-920Kv vs GENS ACE 2726-960Kv
-They gave TOTALLY identical results, with currents almost identical, thrust within a few g of each other ...
The motors are indistinguishable ... -They are exactly the same motor ..

I have also just tested (yesterday) on my Motor Thrust Stand: HACKER A30-12 L 1000Kv vs TURNIGY SK3 3542-1000kv
-These motors also gave TOTALLY identical results, with currents almost identical for each prop, and thrust for each prop very similar indeed...
(See attached PRELIMINARY data sheets for these 2 motors)
I JUST COULD NOT BELIEVE IT -THEY WERE SO SPOOKILY, INCREDIBLY CLOSE ...
THEY ARE SO VERY VERY OBVIOUSLY -EXACTLY THE SAME MOTOR ...
-They just have different clothes on (i.e. a slightly different outer case), but underneath the outer clothes, they are totally IDENTICAL
And their performance is also TOTALLY AND ABSOLUTELY IDENTICAL -even down to the current generated,and thrust produced ...
They are exactly the same motor -There is just no doubt about it, at all ...
-And of course, the Turnigy SK3 only costs 27% of the Hacker -for a totally identical motor

Referring to your analogy about cars: Would you buy a Mercedes Benz for $100,000 -when it is EXACTLY the same identical car underneath as a $20,000 Ford ?(i.e. If it had exactly the same engine, gearbox, chassis, suspension, and every other working part was identical ...) -When the ONLY difference is that the outer body shell of the Mercedes is a different shape and colour ?

-Because that is PRECISELY what we are seeing with Hacker motors.
We have all had this idea for some years, that Hacker motors might in some way be "better", be "higher quality", or have "superior performance"
-when in reality Hacker motors are just one of the many brands produced by Sunray Technology
-and Hacker motors are completely IDENTICAL internally -and also totally identical for performance -to all the other brands i.e. E-F Torque, Turnigy SK3, Hyperion-Z; Gens Ace, Common-Sense-RC, LiPolice etc etc etc

The ONLY difference between Hacker and all the rest, is that Hacker are purple on the outside, and they have the name "Hacker" printed on the outside
-And that they cost 4 or 5 times more than many of the other totally identical motors(e.g. Hyperion-Z, Turnigy SK3, LiPolice etc etc ... )

QED .... ?

In reality, I can see now that it has all been a big con trick by Mr Hacker ...
It has all been down to clever marketing and publicity ...
-To somehow make us all think that Hacker motors might be "different" from, and "better" thanthe other brands ...
BUT: There is just no basis for this idea at all.-Scientific and objective tests and results are now showing very clearly indeed, that Hacker motors are just the same as all the other motor brands ...


Pics show: 1, Preliminary test results for TURNIGY SK3 3542-1000kv; 2, Preliminary test results for HACKER A30-12 L 1000Kv
-These 2 motors are almost identical -Indeed, it could be results fromtwo different Hacker A30-12 L motors-they are that close ...
-Please note these results are very recent -and more tests will be done, with different and larger props ...
see:http://www.rcuniverse.com/forum/fb.asp?m=11463161 for details of Motor Thrust Test Stand used

DrMotor

It was a pleasure, rosnik. Thank you very much, for continuing to contribute to the thread.

Here are DriveCalc results for 5S LiPo, on the Turnigy SK3 5055-430Kv motor, using different props: I have included the results for 16x8 to give a comparison with the other two:

prop Current (A) RPM Thrust (Kg) g/W
16x8 46.2 6606 4.57 5.3
17x8 50.1 6486 4.53 4.9
18x6 50.1 6484 4.82 5.2

There is no 17x6 prop on the database that I can test.
As you can see, a 17x8 prop draws more current than 16x8, and actually gives slightly less thrust.
The 18x6 prop draws exactly the same current as 17x8, and gives more thrust than the 2 other props. Its g/W value is good, at 5.2.

Seems to me, that props to definitely try on the REAL motor, would be 16x8 and 18x6 ...

Pic attached, shows the simulation for the 18x6 prop, with 5S LiPo (18.5V).

rosnik

I'll test 18X6 , nice idea!
Thank you for info DrMotor!

DrMotor

Hello fly210sv: Thanks very much for comments. Please keep contributing.
So: Do you think that the G46 is the IDENTICAL motor to the E-Flite Power 46 ? Does it look like it comes from the very same factory ?
Do you think the G25 comes from the same factory as the E-Flite Power 25 ? Does it look identical ?
-Please let us all know ...

DrMotor

Now - here is an unexpected fnding:
The Turnigy G160 motor has a similar large central circular plateon the rear housing, as the LiPolice 5030 F3A motor
-Of course, we KNOWthe LiPolice motor is made by Sunray Technology, the maker of Hacker, Hyperion-Z, E-F Torque motors and all the other brands ...

So: I just wonder, out of curiosity -which factory might make the Turnigy G-series motors ....?

The E-Flite Power 160 also has the same central plateas the Turnigy G160 -I guess this plate is used for bolting on the prop adaptor ...
Indeed, the E-Flite 160 and the G160 look identical -looks like they are probably both made in the very same factory ... ?
-probably the Himark Electronic Model factory (a.k.a. the ChinaHimark factory )

Also see: http://www.rcuniverse.com/forum/fb.asp?m=11466556

Of course, itmay just be pure coincidence that the LiPolice has a similar plate onthe rear housing, as the E-Flite / G 160 motors

DrMotor

E-Flite motors -same as Himax / JP-Energ / TopModel X-Power motors

The Turnigy G160 / E-Flite 160 -started me looking at a few other motors (always a bad idea ...)
-The E-Flite 160 is the same as the Turnigy G160 motor -already said that

-AND: the X-Power XC 6332-16 motor -also has exactly the same central plate on the rear housing (see pic 1) .... !

In fact, the front housing of the X-Power motor looks very similar to the E-Flite / G motor (pic 2)
-and is also nearly identical with the HIMAX HC 6330 front housing (pic 5)

and the X-Power 6332-16 motor is exactly the same motor as the JP-Energ C 63-32 motor (pic 3)
And is also identical to the: HIMARK C 63-32-18 motor -from Model Engines, in Australia (pic 9)

AND: Also, the E-Flite / Turnigy G motor, has almostexactly the same front appearance as a HIMAX HC 6330 motor (pics 4, 5)

SPOOKY ....

The reason that these motors are all so very similar ?
-E-Flite, Himax, JP-Energ, TopModel X-Power, and HiMarkmotors -are ALL made at the Himark Electronic Model factory (a.k.a. the ChinaHimark factory )
-Pics 7 & 8 show some typical HiMark / ChinaHimark "C-Type" motors
Clearly, these are identical to E-Flite / Himax /JP-Energ / X-Power /HiMark motors


Pic 10 shows that the Chinahimark C 3526 motor,looks to be the very samemotor as the E-Flite Power 25 motor(shown in pic 11)


Pics show: 1, X-Power XC 6332, rear housing; 2, X-Power XC 6332, front housing; 3, JP-Energ C 63-32, front housing; 4, Turnigy G160, front housing; 5, HIMAX6330, front housing (the Himax 6332 is identical);6, E-Flite Power 160,front housing
7,Chinahimark C 6320 motor; 8,Chinahimark C 6332 motor
9,HIMARK C 63-32-18,260Kv motor -fromModel Engines, in Australia-THIS IS IDENTICAL TO X-POWER & JP-ENERG MOTORS
And: Pic 10: Chinahimark C3526 motor-looks just the same asE-Flite Power 25 motor (pic 11); just has shaft coming out other side...

DrMotor

FOR F3A 2m planes: There is also:

X-Power XC 6325 /12 F3A motor, 562g (with prop adapter), KV 228, D63 L58; for 10S LiPo
This is relatively inexpensive: 124.90 € =$159
http://www.topmodel.fr/en/product-de...r-xc632512-f3a

From the naming code this motor has -"6325" -this indicates it is 63mm external diam, and has a 25mm long stator -the stator will be 5325. It will also be 12T.
-Most F3A motors have a 5030 stator, or a 5330 stator (-like the Himax 6330-210 F3A motor -has a 5330 stator)

So: This X-Power XC 6325 motor, with only a 5325 stator, is likely to be a little underpowered for F3A ...


PS: Does not the front housing of this X-Power motor, look identical tothe Himax / E-Flite / TurnigyG motors ...?

bradywat23

My Feedback: (16)

Hey great thread! Anyway do you have any idea of which factory produces the Dynam brushless motors that come with dynam planes. Thanks for your time!

bradywat23

My Feedback: (16)

I'm sorry I quoted the wrong brand. It is Detrum motors in Dynam planes Sorry about that.

DrMotor

Isn't "Detrum" a Dynam, brand ...?
I have certainly seen a range of ESC's called "Dynam Detrum" -They are just re-branded HobbyWing ESC's
- http://www.rcuniverse.com/forum/fb.asp?m=11216611

About Detrum motors, if you post a link to them, I will have a look later this evening ... Cheers mate

DrMotor

Here is post #11 from, RCU "Electric Pattern Aircraft" section - http://www.rcuniverse.com/forum/fb.asp?m=11466630 :
Silent-AV8R: It is not a question of me "thinking" that this is the case.And it is not at all about "HobbyKing" stuff -it just happens that they sell the Turnigy SK3 motors which are made by the SunRay Tech factory.
No, the issue is MUCH MUCH wider than HobbyKing, or Hacker or others. -It is about one single factory making the same exact motors for more than 25 different brand names.
We do know, without any doubt whatsoever, that Hacker, Hyperion-Z, OK Hobby Infinite and Turnigy SK3 motors are all made together at the Sunray Technology factory in Shenzhen, China.

-And not only are these motor brands made at this Sunray factory. Many others are also made at this factory, including: Extreme Flight Torque, Shulman Aviation FURY, Gens Ace, Common-Sense-RC, LiPolice, Pelikan Foxy, Viper VA, Apache, Pilotage Nova-Line, MegaPower Taurus, Lipotech, Sonic Electric, BMI Models "Spitz" motors, Precision Aerobatics Thrust motors, Waypoint E-series motors, Boost motors (from Pichler -sold by Robotbirds in UK), JP E-Pro motors; ELE motors (now discontinued) -there are probably more than this, we just don't know about them yet ..

-That is precisely why all these motors have basically identical specs and completely identical performance
-Hacker motors are just the same as all the rest -they are totally IDENTICAL internally and in performance -and there is no earthly reason at all why we should pay 4 or 5 times as much for a Hacker or E-F Torque motor ..

ALSO: We know that O.S. motors, and Futaba motors, are also made at this Sunray Tech factory.

In addition to this, we now know that Sunray also make the ESC's for most of the same brands that they make brushless motors for. -This a relatively new finding.
see: http://www.rcuniverse.com/forum/fb.asp?m=11452486 post #43 onwards.

We know for certain that Sunray make the following ESC's: Hacker X-Pro; Hyperion Titan; Extreme Flight Airboss; Common-Sense-RC; Sonic Electric; Gens Ace; OK Hobby Infinite; Shulman Aviation FURY ESC's; Apache; LiPolice; Pilotage Nova-Line; BMI Spitz standard ESC's; BMI Spitz data log ESC's; HDX Brushless 35A ESC; JP E-PRO ESC's; and also: ELE-RC "Advance" ESC's (now discontinued);

In addition, Sunray Tech also make Turnigy dlux ESC's., and Turnigy Trust ESC's.
It is also very likely indeed that Sunray make Jeti ADVANCE and Jeti SPIN ESC's; see http://www.rcuniverse.com/forum/fb.asp?m=11463027
They may also make Precision Aerobatics Quantum ESC's (after all, they DO make PA Thrust motors ...)

See: http://www.rcuniverse.com/forum/fb.asp?m=11465548(and also perhaps: http://www.rcuniverse.com/forum/fb.asp?m=11465908 )

DrMotor

Here is post #17 from, RCU "Electric Pattern Aircraft" section - http://www.rcuniverse.com/forum/fb.asp?m=11467123
Silent-AV8R: You overlook one very obvious point: The reason that the Gens Ace, the Hacker, the Turnigy SK3 and the Hyperion-Z motors all give totally IDENTICAL results on the Test Stand -is because underneath the purple / silver / blue /green coloured outside wrapper, they are all EXACTLY THE SAME MOTOR UNDERNEATH.

-That is why they all have the very same specs, and that is why on the test stand, they all give totally IDENTICAL resuts -for current, RPM, thrust, everything ....

I am not a dyed in the wool anything fan -I use whatever is best, and I always use the proper tools for the job -including brushless motors.

PLEASE NOTE: I am not just testing "HobbyKing" SK3 motors -I am also testing Hacker, Hyperion-Z, Gens Ace, Foxy, and I will also test some LiPolice motors.
-So we can eliminate your quite inappropriate comment, about this " ... only being to do with HK ...".
This whole re-branding business -is a MUCH WIDER ISSUE THAN "HK" or than Hacker...

What we have here, is the SunRay Technology factory making EXACTLY the same motor for at least 25 different brands -and to hide that they are all exactly the same motor, they just give them different outside colours, and some different shaped end housings ...
-But inside, underneath the outer clothes, they are all exactly the same ...

And for some of these identical motors, depending on their brand name,we end up paying 4 or 5 times as much, for the very same identical motor ...

-Dr Kiwi (Phil M) has also tested many OK Hobby Infinite motors (his test stand will go up tomotors of~100g) and it is very clear from his results that these Infinite motors are ALSO identical with Hacker, Hyperion-Z, Gens Ace, Turnigy SK3, LiPolice etc etc -and come from the same SunRay factory as all the others.

If Hacker really was 10% better, or 20% better, or 30% better, or 50% better than some of the others, then I would not mind paying 3 or 4 or 5 times as much for a Hacker. Not in the slightest ....

But what I do NOT like -and it is now incredibly clear -is that Hacker is EXACTLY the same motor as: Hyperion-Z, Gens Ace, Turnigy SK3, Common-Sense-RC, LiPolice, OK Hobby Infinite, Shulman Aviation FURY etc etc etc
-And yet we are STILL paying 4 or 5 times as much for a Hacker motor, compared to the others -when it is a completely IDENTICAL motor to all the others ...

That, I do NOT like

bradywat23

My Feedback: (16)

Thanks and about the motors, I cant find any information about them except that it is a BM3720-650 Hopefully you can work your magic and any information would be appreciated!

DrMotor

Thanks very much indeed for this comment. I am grateful.I do REALLY appreciate it.

I also hope many other people will contribute to this thread.

COME ON
LET'S ALL GET POSTING ....

DrMotor

REQUEST TO EVERYONE: PLEASE CONTRIBUTE TO THIS THREAD:

RE: ALL BRUSHLESS MOTORS: From small 5g motors,up to large 1000g or >1500g motors:

If you have used, or know someone who has used, brushless motors that have worked well and that you have been impressed with,
PLEASE post information about these motors (their performance, and also cost -and the supplier)
- on this thread.

Similarly, if you have bought a motor, and for some reason have not been happy with its quality or performance, please also post information about this, on this thread. This will be very useful to all of us.

COME ON
LET'S ALL GET POSTING ....

DrMotor

Yes, bradywat23:We DOknow the factory which makes these motors;
I will post information and motor pictures tomorrow

It is the TOPBAND factory, in Shenzhen, China- http://www.topbandmotor.com/en/chi/index.aspx

Topband make ALL the Dynam Detrum motors -all the standard airplane ones, and also the EDF ones.

In addition, Topband makeALL the Exceed-RC"Optima" motors, both the standard airplane ones, and also the Optima EDF motors.

Topband also make some of the E-Flite EDF motorse.g. The E-FliteBL480 Ducted Fan motor,4000KV - http://www.e-fliterc.com/Products/De...dID=EFLM1550DF (see pics 3,4)

Topband also make some of the Turnigy EDF motors e.g. Turnigy 2815 EDF Outrunner 4000kv for 55, 64mm fans (see pic 1)
http://www.hobbyking.com/hobbyking/s...r_55_64mm.html


Pics show:1, Turnigy 2815 EDF motor,4000kv; 2, Topband AE-2815D-01A EDF motor 3,4, E-Flite BL480 EDF Motor, 4000Kv;

DrMotor

DYNAM "DETRUM" MOTORS are made by the TOPBAND factory

The range of Dynam Detrum motors can be seen at: http://www.dynam-rc.cn/Products_31_1.html -However, Dynam themselves give no detailed specs -e.g. weight, dimensions, for their motors.
-Dynam motors are also sold by Hobbypartz and Grayson Hobby, and others. Very frequently however, there are very few detailed specs for these motors, I am not sure why this the case.Hobbypartz, for instance, give good detailed specs for their Rocket and Optima motors ...

The range of Topband motors is at: http://www.topbandmotor.com/en/chi/a...=161&comid=113

Dynam Detrum BM2810A-KV850 (pic 1) - http://www.graysonhobby.com/catalog/...50-p-1979.html
-same as: Topband AE2810-01D, 47g (pic 2) - http://www.topbandmotor.com/en/chi/p...=195&comid=113

Dynam BM3715A-900kv (pic 3) - http://www.graysonhobby.com/catalog/...or-p-1975.html
-same as: Topband AE3715-01A, 113g (pic 4) - http://www.topbandmotor.com/en/chi/p...=251&comid=113

EDF MOTOR:
Dynam BM2815D-KV4000 EDF motor (pic 5) - http://www.dynam-rc.cn/Products_view_124.html
-same as: Topband AE2815D-01B, 71g, Kv 4000 (pic 6) - http://www.topbandmotor.com/en/chi/p...=244&comid=113

-It is clear that ALL Dynam "Detrum" motors, are made by the Topband factory in China

DrMotor

HOBBYPARTZ "EXCEED-RCOPTIMA" MOTORS -are also made by the TOPBAND factory

The Hobbypartz Exceed Optima motors are at: http://www.hobbypartz.com/optima.html

Optima 400 -2215-1050KV, 60g (pic 1) - http://www.hobbypartz.com/75m72-opti...15-1050kv.html
- is same as: Topband AE2815-04C motor (pic 2) - http://www.topbandmotor.com/en/chi/p...page=3&pid=162
(they have a very slightly different front housing)

Optima 400 2215-920KV, 60g -http://www.hobbypartz.com/75m17-opti...215-920kv.html
-is same as: Topband AE2815-04A
The specifications table for the Optima 400 -2215-1050KV -actually states that it is a "TopbandAE2815-04C" motor ...!
-The spec table for the Optima 400 2215-920KV -states that it is a "Topband AE2815-04A " motor ...!
SO WE KNOW FROM THIS,THAT ALL OPTIMA MOTORS MUST BE MADE BY TOPBAND ...

EDF Motors:
Exceed RC Optima 64mmEDF,4900KV, 59g (pic 3) - http://www.hobbypartz.com/75m94-ducted-2210-4900.html
is same as: Topband AE2810D-01E, 59g, Kv 4900 (pic 4) - http://www.topbandmotor.com/en/chi/p...=238&comid=113

Exceed RC Optima 64mm EDF, 4000Kv (pic 5) - http://www.hobbypartz.com/75m91-ducted-2015-4000.html
same as: Topband AE2610D-01C, 4000Kv (pic 6) - http://www.topbandmotor.com/en/chi/p...=226&comid=113

Clearly, all Exceed-RC Optima motors are made by TOPBAND

DrMotor

EXCEED-RC OPTIMA MOTORS

It is clear from the Pics below, that some Optima motors are simply Topband motors, with their shaft coming out of the other side ...

Pic 1 shows an Exceed RC Optima 450 2220-1050KV motor.

Pic 2 shows a Topband AE2815-01E motor; Pic 3 shows the same Topband motor from the other end.

Some Optima motors are just Topband motors, with the shaft pulled through to the other side ...

DrMotor

TOPBAND MOTORS:
I also notice that these motors are also sold as un-rebranded TOPBAND motors i.e. advertised as "Topband" motors
- by: XC-RC in Australia -http://www.xc-rc.com.au/index.php?ma...cPath=9_97_116
e.g. Topband AE2810-01B, Topband AE3720-01A

And they are sold by: Esky-Heli as a "Topband motor" e.g. Topband AE3715-01A, 110g, 1000Kv
http://www.esky-heli.com/topband-out...e3715-01a.html

DrMotor

POST:

Dynam BM3720A-650kv, Kv 650, 140g
http://www.graysonhobby.com/catalog/...6m-p-1349.html

same as: Topband AE3720-01B, 140g,
http://www.topbandmotor.com/en/chi/p...=254&comid=113