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Old Jan 29, 2016, 11:28 PM
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Just Plane Nutts
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United States, CA, Mountain View
Joined Dec 2011
464 Posts
Outrunner comparison

I'm looking for a more powerful outrunner to try than my current Sapac 3200KV unit. My current knowledge of brushless motors is still limited...

I ran across another motor of similar diameter that is just a bit shorter in length, but higher in rated wattage. I wonder if it would be a better choice? I seek experienced opinions, please.

The Savox's wire-wound core is 5mm shorter and the overall motor 39 grams lighter than the one I already have, but is rated 120-watts higher continuous power. It's wound with thicker wire too. Do you think the Savox would be more powerful motor despite the slightly shorter length? Here's some specs for comparison:

Current motor in use:

Sapac 2842-3200KV Ducted Fan Outrunner (link)
Size: Φ28.5 x 68mm
Max lock-rotor current: 75A
Shaft diameter: Φ4mm
None-load current: 2.8A ±0.2A
Weight: 110g
Resistance(mΩ): 15.0
Maximum Continuous Power: : 417W
KV: 3200
Battery: 3S

Savox BSM-2940 3500KV Outrunner Motor (link)
Size: 29mm x 40mm
Rated Voltage: 11.1 Volts
Voltage Range: 2-4s LiPo
No-load Current: 2.7 Amps
Maximum Continuous Power: 538 Watts
Maximum Continuous Current: 51 Amps
Terminal Resistance: 0.019 Ohms
Motor kV (no load): 3500kV
Pole: 10 Pole
Slot: 12 N
Weight: 71g

NOTE that a good deal of that extra physical length of the Sapac is due to the design of it's rotating can. The wire-wound cores are only 5mm difference in length.
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Last edited by AirDOGGe; Jan 29, 2016 at 11:38 PM.
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