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> Electric Motors > Outrunners by size > 35 to 44mm


HobbyKing Donkey ST3508-730kv Brushless Motor (US Warehouse)

HobbyKing Donkey ST3508-730kv Brushless Motor  (US Warehouse)

When pulling power matters and looks.. well.. just dont, then the HobbyKing Donkey ST3508 is the work horse for you. This tough-as-rawhide motor features a heavy duty mount, a 5mm shaft and self oiling bushings that just wont give up like some of the bearings in those little "Show Pony" motors.

RPM/v: 730kv
Dimensions: 41 x 28mm
Shaft: 5.0mm
Voltage: 11.1v~14.8v
Weight: 115g
No-load current: 1.9A @ 11.1v
Max Current: 35A
Max Watts: 330W
Mounting Holes: 51mm

Prop Data:
12x6 - 11.1v - 16A - 1060g Thrust
13X4 - 11.1v - 15A - 1140g Thrust
10x5 - 14.8v - 16A - 1180g Thrust

PRODUCT ID: ST3508-730

Kv(rpm/v) 730
Weight (g) 115
Max Current(A) 35
Resistance(mh) 0
Max Voltage(V) 15
Power(W) 330
Shaft A (mm) 5
Length B (mm) 28
Diameter C (mm) 42
Can Length (mm) 18
Total Length E (mm) 44
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Customer Data

Shipped from:
USA West Warehouse



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 Customer rated
Total of 12 discussions.
ROBERT E.  1 points - 9/13/2014
Hi I forgot to ask on my six glass 600mm frame I'm using 30 amp esc. If the 12x4.5 are not correct what size should I use 11x4.7 or what size?, im real new to this hobby, this is my first build I'm 65 and getting dummer everyday,,, please help me out thanx
ROBERT E.  1 points - 9/13/2014
I bought a 600mm glass six hexacopter frame from hobbyking, it now wights about 6 to 7 lbs ready to fly I have A2212/13T 1000kv motors w/10x4.5 cw/ ccw blades on it , no lift off. I'm useing 3-11.1v /2100 / 20c in parallel batteries , what I want to know if I install ST3508 hobby king donky 730kv motors with 12x4.5 props will I get the lift I need to fly
saltyisildur  33 points - 3/22/2013
can this motor run on 6 s?
 M1cie 35 points
Not for long. I never try, but i won't try.
Joseph  2 points - 2/19/2013
It has "oilite" bushings. powdered bronze bearings infused with oil . When shaft spins, it creates heat, which releases oil from bearing. My opinion, Joe
les  3 points - 2/15/2013
self oiling is oilite brass ie brass bushings that are oilsoaked
Customer Reviews
Overall Rating
Dirt Torpedo
Like it?
Nice beefy motor for a very good price. Tested in a .40 size Eindecker type plane on 4S and 11x7 prop, adequate for scale flight, ran cool with no signs of heating. Moved to a small balsa low wing aerobat (Tiger 400 / Mini Pulse type) and it's a real champ. Its a little heavy but I needed nose weight so its perfect. It is ugly and crude but nobody sees it under the cowling! Can't attest to longevity since I've only flown it less than one hour but so far its smooth and quiet. Very impressive. Only gripe is does not come with a prop adapter

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Overall Rating
Like it?
I bought it for a 5' 5" twin boom slow flyer. ButIt definitely draws more than 16A with a 12x8 and a 3S. I was using an SS 25-30A ESC but it burned out the first time I tried to fly it. Definitely use at least a 35 or 40A ESC. But it seems pretty powerful, but 4 crowns so far

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Overall Rating
Like it?
I found that this motor was fully capable as indicated in its description.
It is every bit as good as a Supre Tiger .10 that sells thru Tower Hobbies for 29.99.
The only problem that I found was a bit of imbalance. After about 30 minutes of tinkering, I had it balanced and running very smoothly with a Great Planes Slow Flyer 10 x 4.5 prop. It was pulling 18amps. Nice little motor for the price.

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Overall Rating
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All I can say is WOW! I bought this motor for a new quadcopter I built from scratch and, with a little work and forethought, they work unbelievably well. After I ordered these motors, I saw some YouTube videos in which people said not to use the Donkey series for multicopters because they vibrate too much. Based on that information, I used bonded neoprene washers between the motor mounts and the frame. This must have killed any vibration because they run as smooth as silk. One thing to note is that you need to order a 5mm-to-5mm prop adapter as the shaft on this motor is a thick 5mm. I personally had a little trouble getting my prop adapter to stay on the shaft, but it was nothing a Dremel tool and some thread locker couldn't fix. Thanks to the sturdy construction, it is almost impossible to bend the shaft or bell, and you would have a hard time breaking the mounts. Many of the motors I have used in the past just can not withstand multi-rotor crashes. With the Donkey motors, however, it is like the crash didn't even happen. Here is my configuration: - Donkey 730Kv - 30A ESC - 10X4.5 props (balanced by hand) - HobbyKing Multi-Rotor Control Board (KK Board) v2.1 This thing takes off like a rocket and flies like a jet and I have to believe that the Donkey's are a major factor. I am even confident enough in this set up to attempt loops and rolls the next time I get to

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Overall Rating
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UPDATE: I stand by my earlier assessment that these are great motors for a multicopter; however, I have discovered now that the motor mount tabs do indeed break easily in a crash landing. Perhaps, though, this is better than bending your frame.

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