Engine and transmission sales and marketing professionals successfully use HydroComp NavCad® to size the main engines, choose gear ratios, and estimate shaft RPM and torque in order to support the construction of a new vessel or the repowering of an existing vessel. NavCad is able analyze a wide range of propulsion options including open propellers, controllable pitch propellers, ducted propellers, and waterjets.

Those working on sales of propulsion equipment for yachts, small craft and other vessels nominally under 75 m (250 ft) have the option of using HydroComp SwiftCraft® and PropExpert®. PropExpert can size propellers and estimate shaft torque and RPM for smaller vessels. PropExpert is limited to applications with monohulls propelled by inboard open propellers. SwiftCraft can predict vessel resistance and propulsion performance for propeller-driven monohulls and added resistance due to appendages such as rudders, shafts, and struts.

  • Sizing propulsion engines based on vessel resistance

  • Matching of transmissions, propellers and waterjets to engine performance

  • Optimization of transmission gear ratio


Transmission selection and sizing
Marine transmission and gearbox manufacturers need tools to accurately analyze and predict the impact of changes to RPM for a wide variety of propulsor options. HydroComp NavCad® is an ideal solution for analyzing performance for the most common maritime propulsor options found today – open propellers, ducted propellers, and waterjets. The performance data allow gear boxes to be correctly sized for new construction and provide accurate predictions of the impact of changing the gear box for ships already in the fleet.

Engine selection and matching
Marine engine manufacturers need tools to accurately match, analyze, and predict the impact of changes to engine RPM and torque for a wide variety of propulsor options. HydroComp NavCad® is an ideal solution for analyzing performance for the most common maritime propulsor options found today – open propellers, ducted propellers, and waterjets. The performance data allows correct matching of engines to propulsors for new construction and provides accurate predictions of the impact of changing the engine on ships already in the fleet. When forensic analysis of existing performance is required to study a customer’s problem, NavCad provides insight into the performance details and can analyze the impact of any changes in the propulsion system using the existing sea trial data.

Recommended software for Engine & Transmission Sales
NavCad: for all boats and ship applications
SwiftCraft + PropExpert: for work boats and pleasure yachts nominally under 75 m (250 ft)