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O.S. - OSMG9490 OSM51010110 51010110 531028500389 4531028500389
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O.S. Brushless Motor 2810-1250
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O.S. Brushless Motor 2810-1250
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Tech Notes
This is the 2810-1250 .28 Brushless Electric Motor from O.S. Motors.


For .28 size airplanes
Stainless steel prop shaft
One front bearing
Rigid rear mounting design
Centrifugal fan design with angled ventilation holes draws air
through the motor and across the windings and magnets for improved
Two year limited warranty through Hobby Services beginning at date
of purchase


.28 Brushless Electric Motor with Backplate, four 3x4mm Mounting
Screws, 3mm Gold Plated Male Plugs attached to leads,
three 3mm Female Plugs with Shrink Wrap, Prop Adapter and
Instruction Sheet


30A brushless ESC such as the O.S. OCA-230 30A 25V, OSMM1110


Rated Voltage: 11.1
Rated Current: 14A
Maximum Current (5 sec): 20A
No Load Current: 0.6A/10V
Phase Resistance: 94 miliohms
Phase Inductance: 30
Maximum Efficiency: 75%
kV: 1250
Poles: 14
Turns: 22
Shaft Diameter: 0.12" (3mm)
Shaft Length: 0.27" (7mm) front & rear
Weight: 1.8oz (51g)
Lead Wire Length: 1.6" (40mm)
Lead Wire Gauge: 17AWG
Length of Motor Can: 1.1" (28mm)
Diameter of Motor Can: 1.1" (28mm)
Length/rear of Motor Can to Prop Washer: 1.5" (37.5mm)
Prop Washer Diameter: 0.63" (16mm)
Thickness of Motor Mount: 0.078" (2mm)
Width of Motor Mount: 1.6" (40mm)
Height of Motor Mount: 1.6" (40mm)

Performance for this motor with different props and LiPo cells is as
follows (all data with O.S. OCA ESCs, and APC props):
Prop Size Voltage Current Watts Thrust Cells RPM
9x6SF 8.4V 18.4A 155 0.72kg 2S 6,650
10x3.8SF 8.4V 17.3A 145 0.84kg 2S 6,950
10x4.7SF 8.4V 19.0A 160 0.83kg 2S 6,650
11x3.8SF 8.4V 19.6A 165 0.90kg 2S 6,450
11x4.7SF 8.4V 22.0A 185 0.87kg 2S 5,850
11x7SF 8.4V 27.0A 227 1.05kg 2S 5,320
9x7.5E 8.4V 16.0A 134 0.65kg 2S 7,110
8x4 12.6V 14.0A 176 0.89kg 3S 12,350
8x5 12.6V 15.7A 198 0.95kg 3S 11,950
8x6 12.6V 18.3A 231 0.84kg 3S 11,450
9x6E 12.6V 24.0A 302 1.16kg 3S 10,100
9x7E 12.6V 27.0A 340 1.08kg 3S 9,150
10x5E 12.6V 25.0A 315 1.30kg 3S 9,930
9x6SF 12.6V 32.0A 403 1.21kg 3S 8,600
10x3.8SF 12.6V 30.0A 378 1.31kg 3S 8,700


Nomenclature is defined as follows:
0MA means 0.S. airplane motor
First two digits are the rotor diameter
Second two digits are the length of the magnets
Last digits indicate the kV of the motor

jxs 11/18/13

– If you need more information, use these O.S. resources –
Email: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970
  Postal Address:

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