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O.S. - OSMG9550 OSM51014004 51014004 531028500044 4531028500044
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O.S. .50 Brushless Outrunner Motor 5025-375
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O.S. .50 Brushless Outrunner Motor 5025-375
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Instruction Manuals: Manual 1 (1.9 MB)
Tower Catalog Page: 63

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Tech Notes
This is the .50 Brushless Electric Motor from O.S. Motors.


For airplanes using a .50 size 2-stroke engine or 4-stroke .91 size
Centrifugal fan design with angled ventilation holes draws air
through the motor and across the windings and magnets for improved


.50 Brushless Electric Motor with Backplate, four Phillips Head
Mounting Screws, 4mm Gold Plated Male Plugs attached to leads,
three 4mm Female Plugs with Shrink Wrap, Prop Adapter and
Instruction Sheet


90A brushless ESC


Rated Power: 1550W
Rated Voltage: 25.9 - 29.6V
Rated Current: 50 - 60A
Maximum Current (10 sec): 90A
No Load Current: 2.0A
Phase Resistance: 27.5 miliohms
Maximum Efficiency: 85%
kV: 375
Poles: 14
Shaft Diameter: 0.23" (6mm)
Shaft Length: 0.45" (11.5mm)
Weight: 14.3oz (405g)
Lead Wire Length: 4.3" (110mm)
Length of Motor Can to Backplate: 2.3" (57.5mm)
Diameter of Motor Can: 1.98" (50mm)
Length/rear of Motor Can to Prop Washer: 2.9" (74mm)
Prop Washer Diameter: 1.06" (27mm)
Thickness of Motor Mount: 0.16" (4mm)
Width of Motor Mount: 2.67" (68mm)
Height of Motor Mount: 2.67" (68mm)

Performance for this motor with different props and LiPo cells is as
follows (all data with 100A ESC):
Prop Size Max Electric Current LiPo Cells
14 x 8 45A 8S
14 x 10 56A 8S
15 x 8E 50A 8S
15 x 8E 38A 7S
16 x 8E 62A 8S
16 x 8E 47A 7S
15 x 10E 60A 8S
15 x 10E 47A 7S
16 x 10E 57A 7S
16 x 10E 43A 6S


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 05/11/11

– If you need more information, use these O.S. resources –
Click Here: Manufacturer's Product Web Page
Email: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970
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