120 degree push/pull control system with single axis bell crank shaft, Main Gear Ratio 8.5:1, Tail Gear Ratio 4.66:1, Main Rotor Diameter: 1355mm (with 600mm main blades, will accept 620mm blades), Tail Rotor: 245mm, Programmable Rotor Head will suit pilots from beginner to competition, Collective Pitch Range +/-14.5 Degrees, Pinch style CNC fan hub for easy 'no dial' installation, Tail hub designed with dual radial and thrust bearing on each tail blade grip, 10mm hollow main shaft / 8mm solid head axle, 425cc (14.5 ounce) Fuel Tank, Designed with ease of maintenance and setup in mind, Modular servo and radio trays allow for very clean radio installation, Same sleek styling as the N9, just smaller. NOW INCLUDES ALI MAIN & TAIL BLADE GRIPS AS STANDARD