[PSUBS-MAILIST] G.L. Propulsion & Manoeuvring Equipment

[Alan James]

This is section 10 of 15. We are slowly getting there.
   In addition to the following rules, the propulsion & steering systems are  subject to G.L. rules for
machinery installations & the rudders to G.L. rules on hull structures.
   The motors are to be designed to be used continuously.
   Propellers need shielding.
   Electronic motor controllers shouldn't fail so the motor continues running, & the motors need to 
be capable of manual control.
   The propulsion equipment needs to be fitted with indicators & alarms to guarantee safe operation.
   Effective reverse thrust for braking has to be provided.
   The stress in the rudder stock can't exceed .5 of the yield stress.
   Independent submersibles (operated off shore without support ship), need to be equipped with
auxiliary steering gear (bit foggy about what this means)
   The steering gear needs to be able to move the rudder from 35 degrees one side to 30 degrees the other
within 28 seconds (how's that for nit picking)
   If horizontal rudders are a necessity on your sub, they need to have an alternative power supply that can
be operated from the control stand. The "slewing" movements of motors used for maneuvering are also subject
to the above requirement.
   There needs to be rudder position indicators & indicators to signal any failure of the steering gear.
   There are rules for dynamic positioning that are required for some operations, but probably don't concern us
& their equipment is examined on a case by case basis.
Regards Alan
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