Introduction
The document discusses the innovative gear solutions provided by RENK for naval propulsion systems, specifically focusing on a double stage CODAD gear box system for a Megayacht built at De Vries shipyard in the Netherlands.

Specifications
The gear system, RENK type BSL 2 x 130/140, is designed for two diesel engines, each with a power of 4,320 kW at 1,800 rpm. It features double helical gear meshes for noise reduction and is supported by sleeve bearings. The system includes a cyclo gear for slow-speed operations and a secondary driven PTO connected by a multi-disc clutch suitable for 320 kW power.

Innovative Features
The thrust bearing, equipped with elastomer elements, isolates structure-borne noise and compensates for radial and angular offsets. It also measures propeller thrust. The gear boxes are mounted on RENK double hard elastic mounts to further reduce noise.

Hydraulic and Control Systems
An integrated hydraulic system provides lubrication and control oil for the clutches. The gear box includes a RENK multi-disc clutch for smooth acceleration of the CPP shaft line.

Compliance and Design
The gear box is built according to Lloyds rules and features a RENK patented ATB type thrust bearing with a separate lube oil system, designed to handle a maximum thrust of 645 kN.