Oil Float Propeller Hub

Augmentias recently designed an oil float hub for a 950 kW renewable marine energy extraction device. Ship’s propellers were traditionally fitted to tapered shafts using machined keyways, but with larger propeller sizes the torque becomes too large for a keyway to work and a shrink fit is used to transfer the load instead. Installation and removal of a propeller hub in then usually achieved by the oil float method.

Rotating renewable marine energy extraction devices – both wave and tidal – work at very load rotational speeds; typically between 5rpm and 20rpm. This means that even when their power output is quite small, < 950 kW, the torque will be proportionally much higher than is the case for a ships propeller of similar power but operating at more than 80rpm.
Key Tasks Completed
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Mechanical analysis
Tidal turbine weight control
Complex installation problems solved