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

[hank pronk]

I am shocked that the motors do not need to be jettisonable 
Hank



On Monday, January 20, 2014 11:55:47 AM, Alan James <alanlindsayjames at yahoo.com> wrote:
  
Hi Joe,
it could be. Hopefully when I read through ABS it will shed some light on areas of uncertainty in G.L..
At the moment I intend to have two horizontal thrusters, two rotating vertical thrusters & no rudder.
This will mean I would have to have a malfunction on two motors on the same side to loose steering.
Alan
 

________________________________
 From: Joe Perkel <josephperkel at yahoo.com>
To: "personal_submersibles at psubs.org" <personal_submersibles at psubs.org> 
Sent: Tuesday, January 21, 2014 5:55 AM
Subject: Re: [PSUBS-MAILIST] G.L. Propulsion & Manoeuvring Equipment
  


Alan,

I'm going to assume that auxiliary steering means a secondary means of moving the primary surface. As in a sailboat using a tiller as backup for an inop pedestal.

Joe 

Sent from Yahoo Mail for iPad  



________________________________
 From:  Alan James <alanlindsayjames at yahoo.com>; 
To:  Personal Submersibles General Discussion <personal_submersibles at psubs.org>; 
Subject:  Re: [PSUBS-MAILIST] G.L. Propulsion & Manoeuvring Equipment 
Sent:  Mon, Jan 20, 2014 10:31:44 AM 
 

Hi Havard,
I'm going through the Germanic Lloyds rules for classification & certification of submersibles & 
summarizing it for people that may be interested. Most of the group come from the U.S.A where
they have the American Bureau of Shipping as the main submersible classifyer.
Alan
 

________________________________
 From: Håvard Hardy <haavard.hardy at gmail.com>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Monday, January 20, 2014 9:05 PM
Subject: Re: [PSUBS-MAILIST] G.L. Propulsion & Manoeuvring Equipment
  


sorry, have to ask.. G.L rules?



2014/1/20 Alan James <alanlindsayjames at yahoo.com>

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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