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The vortex fin is called HVAF (Hub Vortex Absorbed Fins) in China and PBCF (Propeller Boss Cap Fins) in foreign countries. The original technology originated from the ship owner's own energy-saving needs, with 2% to 5% energy-saving effect.
HVAF is attached with small fins on the boss cap,
The number of fins is same as that of the propeller blades. 
HVAF mainly recovers the energy loss of propeller hub vortex in propeller down stream.
The geometry shape of HVAF is very simple, 
And HVAF can be installed behind the propeller easily as original boss cap,which rotates together with the propeller.
HVAF can save fuel consumption by 2%~5% as operating at the same speed.
Low investment, short recycling cost cycle.

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