This is a scaled down version of the AH-1W Super Cobra used by the US Marines. The S-60II frame is now added for simple installation and use of many Hirobo`s scale option parts. This model also uses the stainless steel pipe drive with the 130° angled transmission. This replaces the original "speedo" cable tail drive. Motor: .60 class ? Length: 1450mm ? Start System: Vertical Top Start ? Rotor Diameter: 1550mm ? Rotor Head: FFR ? Muffler: S60-II rear exhaust muffler (Box type/ 0414-263/not included) ? Gear ratio: 9.5 : 1 : 5.27 ?