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  Item found in the following categories;
> Electric Motors > Outrunners by size > 35 to 44mm


HobbyKing Donkey ST3508-730kv Brushless Motor

HobbyKing Donkey ST3508-730kv Brushless Motor

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

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Total of 44 discussions.
Liam  2 points - 2/16/2016
So what kind of performance would I get from this motor if I used it for a 1500-2000g (2m wingspan) pusher style plane with a 4s 2200mah battery, 40a esc, and a 10x5 prop? I'm aiming for a stable slow fpv platform. Thanks for any input, I'm kind of a newbie with this stuff:D
Giladk  11 points - 7/20/2015
Is it possible to drive this motor with 24V? In any case I wont go over 300W
 blackboy 23 points
Hi Giladk Max voltage is 15V.......
Benjamin  11 points - 7/18/2015
Does this come with a prop adapter or any other hardware?
Milton  1 points - 4/29/2015
What frame are you guys using for this motor? I cannot seem to find a 42mm mount plate for this motor
Domino60  7 points - 2/7/2015
Why the shipping is so expensive ? The motor cost 10$ and i need to pay 60$ to buy it, lol. I like hobbyking and everything here inside, I never took anything because the shipping is too high. For 60$ shipping i can buy from ebay a 10kg thrust motor...
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niceee motor and full powerr...

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This motor seems to be very good for low cost big tri - and quad helicopters due to its large diameter. The no load current at 10V is only 1,A. Even at 20V no load is only 1,6A. The measured winding resistance = 0,77ohm. It seems possible to get 500-600gr lift at 2S=7,4V with a 13*4 prop at 7A. This is close to 10gr / W. This motor can also be used up to 6S due to the low no load current for other purposes. My motor had to be balanced due to an inaccurate bell.

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I have been using this motor on a powered glider I build, with an 8 foot wing span (see uploaded video). I have flown the plane about a dozen times, usually with an 1170 prop (slowfly or std electric), with a 50 amp ESC and a 30c 4S battery. I have had no problems with the motor for this type of slow flying / heavy plane application. Note that the 5mm prop adapter has a threaded shaft exactly the size of the propeller hole. so, you cannot for example use a Master Air Screw folding prop without drilling it out. Also, you really have to tighten the collet adapter well or it will fly off.

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Did not come with anything other than the motor. Brittle mounting tabs also. Great power though

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Works very well with an 11x7 on the Hobbyking Spitfire. After the modification original setup makes the spit look like a sitting duck in memories...

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