[PSUBS-MAILIST] tilting thrusters

Alan alanlindsayjames at yahoo.com
Sat Sep 14 14:18:56 EDT 2013


Forget the pictures Phil, we have a conference in Florida you could bring it to.
Alan

Sent from my iPad

On 7/09/2013, at 7:31 PM, "Phil Nuytten" <phil at philnuytten.com> wrote:

> Hi, Guys
> As a follow-up to Vance’s comments (which I fully agree with) you may be interested to know how we position thrusters on our new and much heavier Dual DeepWorker 3000. This 3000 foot (actually 3400 ft.) version of our Dual DeepWorker 2000 uses 6 thrusters – two verticals , (straight up and down, fore and aft on centerline, not in the vectored position of the much lighter single DeepWorker) ,  two aft horizontals and and two forward horizontals which are angled 15 degrees off the hull parallel plane to allow tight turns and very precise lateral  maneuvering  control while working with the dual manipulators on bottom.
> The first of the DDW3000’s finished certification sea-trials day before yesterday and will be shipped out next week – now we have seven more to build for our current contract and a lot of interest in follow-up builds. I got to dive the new dual for the first time last Thursday – pretty slick!
> The foregoing might be plainer if I post a couple of pics of the DDW3000.
> Phil
>  
>  
> From: vbra676539 at aol.com
> Sent: Saturday, September 14, 2013 8:38 AM
> To: personal_submersibles at psubs.org
> Subject: Re: [PSUBS-MAILIST] tilting thrusters
>  
> I don't condemn or recommend side thrusters, but I will give you a little experience and rumor based data to consider.
>  
> Side thrusters require durable and robust motor controllers and (preferably) a tilting control NOT requiring both hands.  Long transects either on the surface or underwater are difficult without some kind of autopilot or at least a trim tab/rudder aft.. If you lose power to one of them (short circuit, for instance) then you are reduced to strictly rotary steerageway (as in, running around in circles). Also, you will have no lateral capability with two thrusters on the centerline.
>  
> The Pisces class from Hyco used side thrusters successfully for many years, but were (and are) limited in close maneuvering as you have to back and fill rather than move laterally, as there are no maneuvering thrusters beyond the side units. This can be ameliorated to a great extent on relatively lightweight vehicles by the judicious use of vectored side thrusters (as in DW-2000 design). Four fixed thrusters, two aft and two in the aforementioned vectoring position allow very good maneuverability with the DWs.
>  
> Perry never used side thrusters as primaries save on the ARMs bells and the old Opsub (which was an early boat built to order for Ocean Systems and never, as far as anyone knows, actually put into service in the oil fields). Instead, they used pivoting centerline thrusters on the 18 series, which worked pretty well.
>  
> Other builders from the early days used side thrusters (Deepstar, Deep Quest, et al) with varying degrees of success. It might be instructive to remember that the Deepstar 4000 made only a very few hundred dives and was considered a limited success based on lack of payload and maneuvering/maintenance issues. Cool looking though, to be sure.
>  
> As to compensation, all the comp thrusters I have dealt with are compensated at the unit itself, so this was never a problem.
>  
> Vance
> -----Original Message-----
> From: Juergen Guerrero Kommritz <groplias2 at yahoo.com>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Sent: Sat, Sep 14, 2013 7:34 am
> Subject: [PSUBS-MAILIST] tilting thrusters
> 
> Hello 
> I need some help. I am seaching some information about lateral tilting thrusters as main propulsion for a submarine. Most of the newer subs have fixed vertical or horizantal thrusters. So there must be a big practical reason.  I asume it can be because problems with presure compensating of the motor. If this wasn´t a problem which other problems will have to instal lateral tilting thrusters?
> I thanks in advance for any information, ideas ore hints.
> Best wishes
> Juergen
>  
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