Ruddog RP540 540 Sensored Brushless Motor (21.5T)

Ruddog RP540 540 Sensored Brushless Motor (21.5T)
Out Of Stock Online
You may back order this item and it will ship when it arrives.
$1.99 flat rate shipping! Learn More
Price: $54.99
Read Reviews
Write a Review

Please Log in to receive a notification when this item arrives in stock.

Check Store Availability
Please be aware that pricing and product availability in-store may vary from what’s available online because each store is independently owned and operated.

The RUDDOG RP540 sensored competition brushless motor was developed using the latest technology in terms of manufacturing and production of competition grade motors. Weighing in at a lightweight 170g the motor is made using highest grade materials including Japan-made steel stator plates and high-temperature 99.9% pure copper wire. Large venting openings improve cooling and provide constant performance over the full run, even in hot conditions. The silver can color looks good on, and off the track.


Weight: 165-175g depending on turn count
Voltage: 2S/7.4V
Size: 540 = 36x51.75mm
Shaft diameter: 3.175mm
KV rating: 1760 RPM/V
Power: 100 Watts
Internal Resistance: 0.0875 Ohm
Max. Current: 21A
Rotor: 12.5x7.2
Timing: Adjustable from 20 to 60°
Sensor: Standard Sensor Port / exchangeable


  • 21.5T RP540 Motor
  • 200m Sensor Lead
  • Manual in German and English language

This product was added to our catalog on January 5, 2017

Verified Owner
Thursday, May 21 2020 (12 months ago)
Ruddog RP540 540 Sensored Brushless Motor (21.5T)
Bought this motor for the USGT class. Set it to 6 amps on a motor analyzer which ended up being 52 degrees of timing and and it is on pace with all other motors on the track. This motor stays cool as well and after a 10 min run is only at 130 degrees. For a motor this cheap its just as fast as my hobby wing v2 and v3 motors as well as my Fantom works motors. Really impressed with the quality and would recommend this motor to anyone.