choice of bowthruster was unusual due to it being of the 'Archimedes Screw'
type rather than the conventional single or twin propeller propulsion.
These screw types are made by
ARS in Norfolk who realised that space (packaging) is important in all
boat layouts and secondly, so is the trapping of rubbish. Props,
particularly thrusters have a habit of sucking in debris and sometimes
clogging to a halt as the rubbish wraps around the blades.
The ARS Archimedes Screw thrusters proved to be incorrectly specified by the old ARS company and the new ARS owners only recommend these small thrusters for UK style narrow-boats. ARS were quick to assist Jenal by supplying two of their 23hp twin propeller thrusters hydraulically driven in the same way as the older ones.
The ARS bow and stern thrusters were initially installed into JENAL. The stern unit on the left has the vertical rear spud-leg for company and the Hydrosta blue hydraulic motor just behind it.
The bow thruster sits below the motorcycle mounting ramp and just behind the 2 bow anchor chain holds. Both unobtrusively installed but easy to access if any servicing is required.
Whilst the placement position was the same, the new twin prop thrusters used a straight rather than the curved Archimedes screw type.
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