Electric Motors, Engines & Accessories > Motor & Accessories - R/C Aircraft > Motors R/C - Brushless - Aircraft [View Top Sellers for this Category] Bookmark this Page

O.S. - OSMG9526 OSM51011101 51011101 531028500273 4531028500273
Manufacturer Stock#
A Closer Look at This Product
  Tech Notes

Replacement & Optional Parts

Browse O.S.

Manufacturer's Product Web Page

O.S. .25 Brushless Motor 3820-960
Click for parts for this item
Easy Pay Yours for 2 Easy Pay payments of $39.99
Select Easy Pay Plan during checkout (currently not available using PayPal).

O.S. .25 Brushless Motor 3820-960
View Larger Picture

Instruction Manuals: Manual 1 (1.9 MB)
Parts Saver Eligible:Yes
Tower Catalog Page: 63

Stock Number
Retail Price
Tower's Low Price
Stock Status
In Stock
Buy Now
Add to wish list
—— Share ——

Quantity Discount
  Special Savings When Buying in Quantities
Special Stock Number Units at this Price Tower's Low Price Click to Order Quantity Discount Savings
O.S. .25 Brushless Motor 3820-960 Add to Wish List
152.76  Buy Now 7.20  
O.S. .25 Brushless Motor 3820-960 Add to Wish List
227.94  Buy Now 12.00  
O.S. .25 Brushless Motor 3820-960 Add to Wish List
453.54  Buy Now 26.34  

Tech Notes
This is the .25 Brushless Electric Motor from O.S. Motors.


For .20 - .25 size airplanes
Stainless steel prop shaft
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


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


60A brushless ESC


Rated Voltage: 11.1
Rated Current: 40A
Maximum Current (10 sec): 80A
No Load Current: 1.7A
Phase Resistance: 26.7 miliohms
Maximum Efficiency: 80%
kV: 960
Turns: 12
Poles: 14
Shaft Diameter: 0.20" (5mm)
Shaft Length: 0.45" (11.5mm)
Weight: 5.64oz (160g)
Lead Wire Length: 3.5" (90mm)
Lead Wire Gauge: 17AWG
Length of Motor Can: 1.7" (43.3mm)
Diameter of Motor Can: 1.47" (37.5mm)
Length/rear of Motor Can to Prop Washer: 2.3" (58mm)
Prop Washer Diameter: 0.87" (22mm)
Thickness of Motor Mount: 0.12" (3mm)
Width of Motor Mount: 1.96" (50mm)
Height of Motor Mount: 1.96" (50mm)

Performance for this motor with different props and LiPo cells is as
follows (all data with 60A ESC):
Prop Size Current LiPo Cells Wattage Thrust RPM
11x5.5E 31A 3S 391W 1.9kg 10,100
11x7E 37A 3S 466W 2.1kg 9,750
11x8.5E 44A 3S 554W 2.1kg 9,350
11x10E 49A 3S 617W 2.0kg 9,100
11x4.7SF 44A 3S 554W 2.2kg 9,400
11x7SF 59A 3S 743W 2.7kg 8,540
12x6E 40A 3S 504W 2.4kg 9,650
12x6SF 66A 3S 832W 2.4kg 8,280
12x8E 49A 3S 617W 2.5kg 9,170
12x10E 66A 3S 832W 2.0kg 8,050
13x6.5E 50A 3S 630W 2.8kg 9,040
13x8E 56A 3S 706W 2.9kg 8,730
13x10E 65A 3S 819W 2.7kg 8,120
14x7E 61A 3S 769W 3.1kg 8,520
14x10E 75A 3S 945W 2.9kg 7,600


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 10/31/12

– 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
  Postal Address:

Click here for Units of Measure Conversion Calculators

Tower Hobbies Has Been Serving Hobbyists Since 1971 • Call 800-637-6050 or 217-398-3636
See Tower Hobbies Reviews at Bizrate.com
Hobbico, Hobby & Model Construction Supplies - Retail, Champaign, IL
We accept the following: We accept the following payment methods: Discover, MasterCard, Visa, American Express, Diners Club International, JCB, China UnionPay, PayPal, and PayPal Credit.
Unauthorized use of any materials presented here is prohibited. Copying or reproducing any elements from this page is not permitted. All prices, descriptions and availability subject to change. Displayed within some areas of our web site, the Retail Price is suggested by the manufacturer or supplier, or estimated in keeping with standard industry practice. It may not represent the prevailing price in your area or a price that Tower Hobbies has ever offered for the item.
Copyright © Tower Hobbies All rights reserved. Do not duplicate or redistribute in any form.