Teignbridge Propellers Accessory
Velocity Aligned Rudders (VAR) and Velocity Aligned Brackets (VAB)
Teignbridge Velocity Aligned Rudders (VAR) and Brackets (VAB), CFD-designed to align with propeller inflow. Teignbridge reports typically 10% better fuel economy and 1–2 kn more speed on a 30 kn vessel.
Description
Teignbridge Velocity Aligned Rudders (VAR) and Velocity Aligned Brackets (VAB) are designed to work with the propeller to improve water flow and reduce resistance. This improves manoeuvrability, rudder response, fuel economy and speed, and also reduces noise, vibration and cavitation.
Design
- VAR packages are designed with CFD simulation of the varying inflow to the rudder. The section twist along the leading edge is adjusted to match the mean inflow, and the process is iterated to account for flow changes caused by the rudder, until drag is at a minimum
- A VAB improves water inflow to the propeller, which raises propeller efficiency and reduces cavitation on the strut
Performance (Teignbridge figures)
- Typically 10% better fuel economy
- On a 30 kn vessel, 1 kn to 2 kn more speed
Applications
Supplied for vessels including an 8 kn ferry, a 16 kn full-displacement superyacht and a 30 kn planing motor yacht, as well as military craft.
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