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Author Topic: Mighty Servant heavy lift vessel  (Read 6471 times)

oldiron

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Mighty Servant heavy lift vessel
« on: November 23, 2010, 04:33:33 PM »

  I'm looking for drawings, and specifically hull profile drawings, for the Mighty Servant or one of the other heavy lift vessels. Can anyone steer me in the right direction for a set? So far, a search of the net hasn't shown anything.

thanks
John
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boatmadman

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Re: Mighty Servant heavy lift vessel
« Reply #1 on: November 23, 2010, 06:38:24 PM »

John,

Have a look here, might be helpful.

http://www.modelboatmayhem.co.uk/forum/index.php?topic=9014.0

If I can help at all, shout out.

Ian
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Umi_Ryuzuki

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Re: Mighty Servant heavy lift vessel
« Reply #2 on: November 23, 2010, 07:42:10 PM »

Hasse Schiffsmodellbau offers the Mighty Servant bauplan in 1:100

http://www.hassemodell.de/HMS.html
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oldiron

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Re: Mighty Servant heavy lift vessel
« Reply #3 on: November 23, 2010, 08:41:56 PM »

Ian:
Thanks  very much for the heads up on your build. great job on the vessel and an informative thread.

Umi

  Thank you too.I had looked at that site earlier. However, there is a caveat to this project. I'm mentoring some 15 year olds, in a local high school, on boat building. One of them is very bright and not afraid of a challenge,which this one is. He wants to take on the job of building one of these. He realizes it won't be a fast job, but he seems to be prepared for that. I'm trying to lend a hand by finding drawings for him. Although the commercial hulls would be good, I think they're a little out of his price range, so scratch is the only viable way to go.

thanks again
John
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Umi_Ryuzuki

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Re: Mighty Servant heavy lift vessel
« Reply #4 on: November 24, 2010, 01:46:36 AM »

You don't have to buy the hull from Hasse Schiffmodellbau...

Just order the plans from them...  ok2
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oldiron

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Re: Mighty Servant heavy lift vessel
« Reply #5 on: November 24, 2010, 03:14:14 AM »

You don't have to buy the hull from Hasse Schiffmodellbau...

Just order the plans from them...  ok2

  Ok, thanks. I'll have to reread the site again.

thanks
John
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Umi_Ryuzuki

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Re: Mighty Servant heavy lift vessel
« Reply #6 on: November 24, 2010, 04:35:17 AM »

It's the difference between the Rumpf mit Deck, and the bauplan,

You want the Bauplan.  ok2
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boatmadman

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Re: Mighty Servant heavy lift vessel
« Reply #7 on: November 24, 2010, 09:45:18 AM »

John,

This type of model really is a challenge, I've built a few boats over the years and Blue Marlin left them for dead in the challenge dept.

One thing you need to think of very early in the build is how to set out the ballast tanks. Mine works ok, but hasnt the capacity to lift anything other than itself.

Make sure you have plenty of dividers in the ballast tanks to minimise sloshing about and the resulting risk of capsize.

I would recommend you have all the ballast tanks pumped as against a split between pumped and free flood. The downside with this is you may need more pumps (I used 4) to ensure you can trim the boat properly.

Stability when submerged is a real issue with these things as most of the buoyancy is at the bows and stern, with very little transverse - I used polystyrene blocks in the ballast tanks.

Let us know how it goes.

Ian
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oldiron

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Re: Mighty Servant heavy lift vessel
« Reply #8 on: November 24, 2010, 10:22:42 AM »

Ian:

  I suspected buoyancy would be a problem. I thought of several tanks all pumped separately to control the level on decent, but how to do it so some control could be achieved. Obviously its worked for you, but not without  a great deal of design effort involved. Its interesting you indicate the instability brought on by the flotation of the forward and aft flotation areas (the bow and stern chambers). My perception, initially, was they would add a measure of stability to the whole vessel.
  This is a far more interesting project than I had first imagined. Thanks for the help.

John

 I
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boatmadman

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Re: Mighty Servant heavy lift vessel
« Reply #9 on: November 24, 2010, 06:42:40 PM »

John,

I was caught out by the instability when Marlin was in the test tank. I submerged her - all was ok - turned away for a second, looked back and she was on the way to a full capsize! Managed to catch her before any harm was done, luckily!

One big problem you will have trying to pump several ballast tanks individually is finding space for the pumps! Despite such a large model, the space for pumps/motors/batteries and electronics is really restricted. I just managed to fit 2 pumps, bowthruster, aux battery, 2 esc's, 4 switchers and 8 ch rx in the forward space, and in the rear was the main battery, 2 pumps and main drive motor.

The 4 tank system I used gave me control of the boat in all directions when submerging and floating up. I found that submerging and floating up stern down a little gave the best control. I fitted my pump suctions at the stern of the tanks for this reason so I could get most of the water out. (there was always a little left in to pump out when on the stand.)

Interestingly, the full size Blue Marlin submerges stern first as well, for the same reasons.

I looked for small (6mm/1/4") solenoid operated valves to enable me to direct pumped ballast as required, but, I couldn't find anything that didn't cost the earth.

Ian
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Navy2000

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Re: Mighty Servant heavy lift vessel
« Reply #10 on: November 25, 2010, 03:14:04 PM »

Hi John

I was wondering was the Marlin a single screw or twin screw when she was widened? I have not been able to find any pics to see how many screws she has on her.

Duane
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oldiron

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Re: Mighty Servant heavy lift vessel
« Reply #11 on: November 25, 2010, 06:35:20 PM »

Hi John

I was wondering was the Marlin a single screw or twin screw when she was widened? I have not been able to find any pics to see how many screws she has on her.

Duane

Duane:

 I don't know, Ian may be the best one to answer this question.

John
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Umi_Ryuzuki

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Re: Mighty Servant heavy lift vessel
« Reply #12 on: November 25, 2010, 06:35:42 PM »

Hi John

I was wondering was the Marlin a single screw or twin screw when she was widened? I have not been able to find any pics to see how many screws she has on her.

Duane

The Black Marlin, and the subsequent Blue Marlin were both built with a single main engine and propeller.
The Actual ships have up to 68 ballast tanks...

Quote from: oilpubs.com May 8, 2000

...

"The ships are powered by a proven, reliable, slow speed diesel engine combined with a large-diameter
controllable pitch propeller", explained Thorsen. "We felt that the highest level of reliability would be
ensured by adopting a direct drive arrangementwith no gearboxes".

A Becker rudder considerably increases steering reliability under slow speed and extreme weather, and
a large bow thruster has been installed in the bow in order to further enhance manoeuvrability.

...

Altogether, there are 54 large ballast tanks in the main cargo area, and another 14 tanks arranged
 fore and aft, thus providing a total of 68 tanks, making it easier to find suitable ballast conditions for
 awkward, difficult cargoes.

In addition to the ballast pumps, a total of 36 ballast tanks can be free-flooded, thus reducing the
critical contact period, a feature which the heavy lift specialist says will again reduce the time required
 for ballasting down during mating operations.

...


Post refit, I believe that additional retractable thrusters may have been added to the Blue Marlin.

.

Also, Check out the new "Super Heavy Lift" proposal that Dockwise is designing...  :o
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Umi_Ryuzuki

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Re: Mighty Servant heavy lift vessel
« Reply #13 on: November 25, 2010, 08:36:08 PM »

Here is a PDF of the new propeller installation on the Blue Marlin, and a text description of the modifications.

http://www.dieselduck.ca/library/11%20interesting/2004%20Blue%20Marlin%20being%20widened.pdf

 :-)
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soldier151

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Re: Mighty Servant heavy lift vessel
« Reply #14 on: December 13, 2010, 01:03:50 AM »

Hi Oldiron
I have some very good photographs of the sort of thing you want, send me a pm and I'll dig them out for you
Soldier151 :police:
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oldiron

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Re: Mighty Servant heavy lift vessel
« Reply #15 on: December 13, 2010, 02:02:56 AM »

Hi Oldiron
I have some very good photographs of the sort of thing you want, send me a pm and I'll dig them out for you
Soldier151 :police:


 Thanks very much for the offer and assistance. PM coming.

John
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