CKV Series Controllable Pitch Propeller (CPP) Gearbox is a heavy-duty marine propulsion gearbox independently developed by NGC Marine (Nanjing Accurate Marine Equipment Co., Ltd., NGC), based on extensive experience in advanced marine gearbox design.

The CKV series features a vertical offset configuration between input and output shafts, enabling flexible machinery space arrangement. In addition to standard models, customized and non-standard gearbox solutions can be provided according to specific propulsion system layouts, power ratings and vessel requirements. The gearbox integrates reduction, clutching, PTO and PTI functions and is widely applied in CPP propulsion systems driven by medium-speed diesel engines.