CKTS Series Controllable Pitch Propeller (CPP) Gearbox is a twin-engine combined drive gearbox (dual input, single output) independently developed by NGC Marine (Nanjing Accurate Marine Equipment Co., Ltd., NGC) for high-power marine propulsion applications.

The CKTS series allows two main engines to operate independently or in parallel, improving propulsion efficiency and operational redundancy. Customized and non-standard gearbox solutions are available to meet specific vessel power configurations, propulsion system layouts and operational requirements. The gearbox integrates reduction, clutching, PTO and PTI functions and is widely used in large CPP propulsion systems.