HOBBYWING 30416051 Platinum 4125 SL 450KV Brushless Motor Era_1950s + Based on phase five units

Based on phase five units built in 1949

Adjustable upper spring retainer

HPb and all subsequent classes received twin hoppers

Also not compatible with KO I

HOBBYWING 30416051 Platinum 4125 SL 450KV Brushless Motor Era_1950s + Based on phase five unitsHOBBYWING 30416051 Platinum 4125 SL 450KV Brushless Motor Platinum 4125 SL 450KV Brushless Motor FEATURES: Dual Dynamic Balance Technology to control motor vibration: The rotor and the complete machine undergo dynamic balancing. The rotor dynamic balancing is completed first, then the operating conditions are simulated. A secondary dynamic balance test is performed on the motor to ensure smooth operation and eliminate any imbalance in the assembly.