Big Bertha has been most modelers' first big build

Extensive safety features: Reverse voltage

Application: 1/10-1/12 Scale On-Road RacingFeatures:

Automatic throttle range calibration

NOTE: This rocket can also be launched on a D12-3 engine when you purchase the ESTES 9753 - 24 mm to 29 mm Engine Adapter

Futaba - BLS177SV S.Bus Brushless Hi-Torque Metal Gear Servo .11sec/513.9oz @ 7.4V ASC70024C Big Bertha has been mostFeatures: Input Voltage: 6. 6 7. 4V Speed @ 6. 6V: 0. 12 sec 60 deg Speed @ 7. 4V: 0. 11 sec 60 deg Torque @ 6. 6V: 472. 3 oz in Torque @ 7. 4V: 513. 9 oz in Power Supply: DC6. 0 7. 4V Specifications: Dimensions: 40. 5x21x38. 4mm Weight: 79g