Typical WorkBoat Rudder and Propeller
A HydroComp Technical Report
graphic displays the typical placement of rudders and propellers
for commercial workboats. As the hydrodynamics of each vessel
is different, we cannot necessarily consider these to be the "best"
or "recommended" placements, but they are representative of existing
vessels whose operation has been considered successful. These
figures are suitable for both single and twin-screw vessels.
shown represent absolute minimum figures. Additional clearance
- up to twice as much as the minimum figure - is better and recommended.
Twin-screw vessels can typically get by with a bit less clearance
than single-screw vessels.
(i.e., projected) area of the rudder is often sized at 3.5% of
LWL * DRAFT.
to plan for the removal of the propeller and shafting. The space
from the end of the shaft to the rudder must allow enough clearance
for the hub of the propeller as it is removed or put in place.
Also, it is common to offset the shaft to the side of the rudder,
so that the shaft may be withdrawn without having to remove the