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  Item found in the following categories;
> Electric Motors > Outrunners by size > Micro & Profile

  RATED:

HobbyKing AP03 4000kv Brushless Micro Motor (3.1g)

HobbyKing AP03 4000kv Brushless Micro Motor (3.1g)


High quality micro motors. Precision wound with silver-copper wire and ultra hard-press laminations.
Extreme performance and efficiency for your micro plane.

Factory Spec.
Kv: 4000rpm/v
Lipo Range: 1~2S (3.7~7.4V)
Suggested prop: 3020
Max current: 2A
Burst current (10sec): 2.5A 
Weight: 3.1g (including mount and wire)
Shaft: 1.5mm
Shaft length: 6mm
Dimensions : 13 x 10mm
 
Test data:
3020 prop (Recommended)
Voltage: 7.4V
Current: 1.7A
Thrust: 61g
 
For 30g 3D airplane and 60g normal flying.

PRODUCT ID: HK-AP03-4200

Kv (rpm/v) 4000
Weight (g) 3.1
Max Current (A) 2.5
Resistance (mh) 0
Max Voltage (V) 7
Power(W) 0
Shaft A (mm) 2
Length B (mm) 10
Diameter C (mm) 13
Can Length D (mm) 3
Total Length E (mm) 15
Update/Add my own data
Customer Data
15g Back warehouse: 0 10+ $17.99
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 Customer rated 5 crowns   
 
Total of 19 discussions.
Greg  1 points - 4/23/2013
 
HK-AP03-4000 Brushless motor it has 3 strands of wire comming out of motor on 1 insulation Question- is this what i connect to speed controller or is it faulty
 K9MGE 62 points
That is what you connect to the speed controller. Those three wires coming out of the insulation have like a clear varnish insulation like the wires used to wind a motor with. You need to remove this from where you solder them to your connectors. About 3/16 in or 4mm off the end. HK has a 3 wire micro connector that works really good. PRODUCT ID: 6pin M-plug
BEST ANSWER CREDIT AWARDED
 Greg 1 points
thanks your reply is perfect. i thort it was the case but not sure** now i am** thank you
 K9MGE 62 points
You are welcome. Glad I could help.
Brandon  6 points - 12/21/2012
 
****
Tressie  231 points - 12/20/2012
 
Anyone know how to determine the pole count?
 MadHatt 104 points
turn the motor upside down... look into it. each spool of copper wire is a pole. This one has 10 in it.
DodgeHobby  176 points - 12/20/2012
 
Anyone think this would fit the RadJet 420?
gilcd85  8 points - 7/11/2012
 
What kind of prop adapter/saver can I get for these motors? Not the alu cone type please - too heavy.. Looking for a prop saver with rubber bands.. oh, and I prefer not to have to buy the AP05 just for the prop savers :)
 nemoskull 49 points
bsdmicrorc . com had some propsavers made out of ply that might work.
 Roy_T 134 points
If you live in Europe, try **** micronradiocontrol. co .uk/prop_adapter.html
 Adverse Effects 23 points
you dont use prop adapters look for the GWS 3x2 Propellers (Standard and Counter Rotating) (6pc) that are sold here
 gilcd85 8 points
I have been using these.. they are made for smaller shaft size. When I drill them through I can make a tight fit with a 1.4mm drill bit but they do slip out eventually.. :( I tried gluing them to the shaft with CA but it makes it extremely difficult to remove them without damaging the motor when they get broken.
cgossett  1 points - 6/18/2012
 
Hi, I'm considering using these for a nano quad also. Was going to use it with either the "2.4Ghz SuperMicro Systems - Brushless ESC - 3.5A" or the "HobbyKing XP 3A 1S 0.7g Brushless Speed Controller"...I'm honestly not quite sure which is better or what the difference is...here's my question. I only see one lead coming from this motor. Do these motors have 3 leads like my larger brushless motors? If not, how do these things hook up to the ESCs?
 nemoskull 49 points
the XP 3A is eaiser to connect, and has more programming options. AUW of the ESC will be 1.3 grams. the supermicrosystems is lighter but much harder to solder. SMD soldering, super tiny. best weight of me is .89 grams AUW. no programming. good thermal cut off, well, slow down. both are very good esc. depends of skill level of soldering. i use the super micro systems ESC. cheaper.
 cgossett 1 points
Thanks for the reply. I'm not too concerned about my soldering skills. However, I'm such a noob programming the things never occurred to me. What significance does thermal cut off play? Also, does this motor have 3 leads?
 wesix 96 points
yes its a brushless so it has 3 leads. thermal cut-off is most important, should your esc run hotter than what is acceptable to the internal IC, it will shut off to protect it. or else it will go up in smoke.
K9MGE  62 points - 5/17/2012
 
Whatr size is the shaft? Factory specs says 1.5mm ****Product config says 2mm. which one is right? What prop adapter is suited for it or does one come with it? THANKS
 Nikers 192 points
the GWS 3020 Propellers fit perfectly with a little push.The shaft is about ~1,4 mm
BEST ANSWER CREDIT AWARDED
adammooren  616 points - 5/9/2012
 
does anyone have specs as to 1 cell and props? It is very hard to find this data on this website sometimes.
 Roy_T 134 points
Try this Gordon Johnson site. Should provide sufficient info for your need. *******home (dot) comcast (dot) net/~gordon-johnson/lcd-apo3.htm
BEST ANSWER CREDIT AWARDED
Helge  5 points - 4/7/2012
 
thrust (amp) on GWS2508 or GWS2510? Any Data?
cale  52 points - 2/14/2012
 
how well will this work in a 67 gram SCALE flying indoor hellcat????
 Roy_T 134 points
This may be underpowered for the Hellcat. Suggest you go with the AP05 motor with 2S lipo for more thrust.
 Matias Enrique 4 points
yo use este motor en un modelo de 50gr. y volo perfectamente. usando 1 lipo.
MrBuddha  2 points - 2/10/2012
 
I'm looking to use 4x this motor for a nano quad i'm building i'm thinking about using 4x Turnigy 7amp speed controller with a 3x2 prop does that seem like a good setup for a nanoquad mostlikly going to be running a 180Mah 2s lipo
 Roy_T 134 points
It's a good motor for a nano quad. However, you might want to consider using other props as the 3x2 props does not generate much thrust. I'm considering trimming 5x3 props for my own nano quad.
Dave  7 points - 8/12/2011
 
is it ok to use this esc with this motor using a 1s lipo? http://www.hobbyking.com/hobbyking/store/uh_viewItem
.asp?idproduct=10334
 steve g 60 points
id say yes you can from reading the specs it'll even make sure you've got 5v going to your reciever, go for it it looks just right for 1 cell operation
 Roy_T 134 points
Yes. My 3mm foam 13' F22 (31.5g AUW) is a great flyer. Powerful for loops but not vertical though. Pity it's been out of stock for a few months now.
Dave  7 points - 8/8/2011
 
ok the wires on this motor are THIN!!!!
im a newb at soldering so i twisted each of these little wires onto some slightly thicker wires and soldered them. i plugged them into my little 3amp esc and nothing happened. i tried them every combination but i got no response from the motor. is there a trick to soldering these little suckers?
 kingjamez 15 points
The wire's insulation (the gold color coating) is removed with heat. So when you solder this wire, be careful that you don't apply too much heat and then leave an easy short between the wire since the insulation could be burned away.
 Dave 7 points
hi thanks for yr reply. im using the HK xp 3amp 1s esc. does it matter which of the 3 wires go on a b or c on the esc? and i should be able to solder these wires to slightly thicker wire shouldnt i?
 kingjamez 15 points
It doesn't matter where you solder the wires to, a, b, or c. If it spins backwards, just swap any two wires. Yes, your should have no problems using thicker wire as long as you don't short the output of the speed control. There is not much space between the outputs on the speed control so thicker wire is more difficult to correctly solder for me.
 unleaded 163 points
kingjamez i know this is an old post but i have had this motor for a while i am going to use it in a 420radjet but was hesitant as the wires looked bare and i wasnt sure how i was going to insulate them you have answered my question many thanks
Dave  7 points - 7/21/2011
 
could someone recommend which esc and lipo to use with this motor? any links to HK products would be great. thanks
 Knifenslow 21 points
I used a GWS5030 prop with a turningy 130mAh LiPo and XP 3A 1S esc and it gave relaxed performance on a 35g flying wing. If you want to go vertical on a 35g airframe you need to get the 7500kV motor and run it with a 5030 prop
 one-flight 55 points
Hi, I use Turnigy 2S 138 mah( no balance plug!) also Zippy 2S 180mah - both with best results. More power on 180 Zippy. ESC only Turnigy plush 6A without shrink tube and shortened wires. Experimenting with small Cox props - good results!
Brrox  4 points - 5/27/2011
 
What battery and propeller are you using this motor?
 steve g 60 points
2 CELL 200MAH AND A 3.2 - 4.2 PROP HOPE THIS HELPS
 __Boom 39 points
I'm using a 2cell 180mah zippy and a GWS 3x2 prop. I tried something a bit bigger (3x3) but it got hot very fast.
Rhys Porter  8 points - 4/27/2011
 
Sorry but how do I wire this up? Its only got one wire going in... Well - its got 3, but theres no insulation so they'll all short out...
 steve g 60 points
the wires are coated in an elctric no conductive resin just solder them directly to the esc wires and insulate in heat shrink to be safe just be carfull as the wires are fragile
BEST ANSWER CREDIT AWARDED
 Matias Enrique 4 points
los cables estan recubirtos por un barnis q evita q hagan contacto unos con otros. al soldarlos acuerdate de aislarlos.
Daniel  90 points - 3/14/2011
 
Do HK sell a 1.5mm prop adapter? I've seen the cone one but it's massive compared to this motor, i'd prefer the rubber band type, I can get them at the LHS, but they are not cheap.
 Matias Enrique 4 points
fijate q tambien se venden helices para direc driver.. estas tiene un orificio de la medida del eje del motor
eilsel  8 points - 12/29/2010
 
Anyone tried 1s with 4x2.5 inch prop for thrust and current?
 Serzhant 56 points
GWS 4.5x4 1S 1.8A trust 36g
Stuart  19 points - 1/25/2010
 
What prop adapter can be used with this motor?

Any one used one to upgrade a Micro 4 Site?
 wim verleyen 70 points
The one that's delivered with the AP05.

Jason,

Would you please be so kind to put one in this motor's bag too?
 duzzo86 17 points
Hi, i'm trying to upgrade the Ultra micro Mustang from parkzone. I'm going to use 127mm x 76mm propeller with this propeller www.link took all the informations here: www.link hope this answers to you question. Bye
 SargeNZ 206 points
I dont know wether it's a fluke or designed that way, but the small GWS props will push on (firmly) to the raised part of the motor case that the shaft comes out of. Perfectly centered.
Customer Reviews
Overall Rating
Ramir
460 likes
ValueUNRATED
QualityUNRATED
4 thumbs up!
I use this motor in my depron P51 Mustang (31g flying weigth) with 1 cell 138mAh and I am very happy with.


2 comments. Reply..

Create an account
Overall Rating
met2t
25 likes
ValueUNRATED
QualityUNRATED
2 thumbs up!
I have purchased all of the AP micro motors and by far have been the best performing motors I have from Hobby King.All performed as specified.They work well on 2 cell with proper throttle management. Very pleased!!!

Can't wait to see whats next.


No comments. Reply..

Overall Rating
uwe_strecker
27 likes
ValueUNRATED
QualityUNRATED
1 thumbs up!
accurate weight of 3.1 gr.
easy to glue in firewall of 30r gulliwing Piper and drives a GWS prop with handmade plastic spinner.
pulls 25gr with 70ah single lipo


2 comments. Reply..

Overall Rating
Teh Tarik
233 likes
ValueUNRATED
QualityUNRATED
1 thumbs up!
I use this motor AP03 with Turnigy 5A 1S ESC.
It works fine with Lipo single cell.


No comments. Reply..

Overall Rating
Buzzsaw46
16 likes
ValueUNRATED
QualityUNRATED
Like it?
Nice running little motor, not what I had hoped for power wise on 1s.


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