This is the replacement motor for the Tower Hobbies Mustang EP. FEATURES: Virtually maintenance-free; no commutators or brushes to wear out INCLUDES: One Brushless Motor with pre-installed 3.5mm bullet connectors and motor mount REQUIRES: Speed control for Brushless Motors such as the ElectriFly Silver Series SS-45 (GPMM1840) Propeller: 9x6E-12x6E SPECS: Aircraft Application: 75-100 Watts Per Pound Trainer & Sport Performance Weight Range: 3.9-5.2lb 100-150 Watts Per Pound Aerobatic & High Speed Performance Weight Range: 2.6-3.9lb Over 150 Watts Per Pound 3D & Extreme Performance Weight Under 2.6lb Can Diameter: 1.38" (35mm) Can Length: 1.18" (30mm) Shaft Diameter: .16" (4mm) Shaft Length: .65" (16.5mm) RPM/V (kV Rating): 1000 Weight: 2.47oz (71g) Propeller: 9x6E-12x6E Input Voltage: 7.4-11.1V Max. Constant Current: 35A Max. Surge Current: 40A Max. Constant Watts: 388W No Load Current: 1.8A COMMENTS: The three-number designation refers to Motor Diameter, Motor Length and kV Rating.