This is the Reedy Sonic 540 Mach 2 5.5 Turn Brushless Modified Motor. Small modifications have been made to the already competitive Sonic series to enhance performance, reliability and user-friendliness. An alloy end cap replaces the plastic version to prevent unwanted movement that could potentially make changes to the timing, but also helps to provide improved bearing alignment. Strategically placed vent holes are now slightly smaller to reduce the chances of debris getting inside the motor while still maintaining excellent airflow. Changes found internally include updated bearing sizes to help increase maximum RPM and to improve reliability, and silver-plated solder tabs reduce power-robbing resistance.

The precisio-balanced, high-strength sintered rotor has not been changed, and a variety of optional rotors are available to fine-tune for specific applications and tracks. Meets all ROAR, EFRA, and IFMAR specifications.

Features:

• Lightweight design
• Optimized air flow
• Dual precision ball bearings
• High-strength balanced sintered rotor
• Adjustable timing with alloy end cap
• Silver-plated solder tabs
• Completely rebuildable
• Competition proven
• 200mm sensor wire
• Ultra smooth, sensored operation
• Built to ROAR, EFRA, and IFMAR specs

Specifications:
Cells: 2S LiPo, 6-cell NiMH
Diameter: 35.8mm
Length: 52.9mm
Shaft Diameter: 3.17mm
Weight: 180g
RPM @7.4V: 45,397
kV: 6135
Power (W): 505
Max Current (A): 68
Efficiency: 93%