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Old 10-28-2014, 11:18 AM   #1
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Question How about to extend the length of my 400T

My wife and I brought a new MS to Sweden in 2005 and we are happy with its performance in this part of the world.
Now I have an idea, that may sound weird, and its to extend the hull of my 400T, during the winter when we keeps our boats indoors. I did see a 400T 2008 for sale in Australia with an extension of the hull like 2-3 feet under the swim platform.
Does anyone know if its standard or special made?
If its standard, do you guys knows or have an idea were to find information about the purpose, the outcome like performance etc and maybe where to find some drawings? (also have needs for the standard drawings of the hull).
What are your opinions to put a smaller engine with a S-drive as a "limp home system" in this extension?
Would appreciate a lot any comments on this theme
boan400
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Old 10-28-2014, 02:38 PM   #2
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Wow, I saw your similar post over on the Mainship Yahoo forum and decided to stay out of it for now and see where it went. But here is a little easier to post and follow the responses, so here goes:

Are you sure that you are talking about the Mainship 400? The 390 came with an integral swim platform that extended the waterline length. Lots of problems with leakage and Mainship probably wishes they never had done it that way.

But I don't think that the factory installed one on the 400T. You might browse Steve Cyr's excellent website dedicated to his 400T at Steven Cyr's Stella Blue Site. It gives lots of ideas for upgrades but not adding a waterline extending swim platform.

If you were to add one like the 390 has then you might screw up the balance and could certainly affect the rudder response. You would be adding several feet of displacement behind the rudder pivot point, so it can't help but act differently.

And you are also thinking of adding a get home drive there!! Buy a Nordhavn if you want a get home engine.

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Old 10-28-2014, 03:12 PM   #3
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I've sent you a email :-)
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Old 12-07-2016, 02:33 PM   #4
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Hi robertgerle
It's 2 year since You encourage me to go on with my project. I'ts more or less finshed at the time being. I will thank you for that.
If you are interested there are articles in the Swedish magasin Praktiskt Batagande describing the project. It went out very well.
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Old 12-07-2016, 05:07 PM   #5
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Pictures or it didn't happen...
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Old 12-08-2016, 03:37 PM   #6
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How about to extend the length of my 400T

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Old 12-08-2016, 03:42 PM   #7
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Old 12-08-2016, 03:45 PM   #8
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Hi Clynn
I did it.
Boan
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Old 12-08-2016, 03:53 PM   #9
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Greetings,
Mr. b. Very nicely and neatly done. Do the new twin rudders work in conjunction with the existing rudder?
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Old 12-08-2016, 04:28 PM   #10
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Thank you. Normally in conjuction with the existing rudder. But also autonomously if needed.
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Old 12-08-2016, 04:33 PM   #11
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Okay, that's pretty cool. Nice work.
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Old 12-08-2016, 04:44 PM   #12
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Me no comprehend... Not fully anyway. Am I missing something here?

Single screw boat with added (in-line) single screw engine and pod/prop in/on/under newly expanded swim step???

Nice looking job. But why?? With two more rudders no less...

Is this so boat gets better nmpg? If so... how much better nmpg is outcome??

And, in correlation: Total financial amount and time cost for all the added paraphernalia... in regards to dollar savings reducing fuel use??
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Old 12-08-2016, 04:55 PM   #13
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Greetings,
Mr. A. If you read the OP's original post, it is for a "get home" system. I suspect fuel savings don't enter into the equation.
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Old 12-08-2016, 05:05 PM   #14
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Quote:
Originally Posted by RT Firefly View Post
Greetings,
Mr. A. If you read the OP's original post, it is for a "get home" system. I suspect fuel savings don't enter into the equation.
OK, RT... But, But???
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Old 12-08-2016, 05:35 PM   #15
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I understand it is a get home so not intended to run except in emergency. What is the impact on the drag? Propellor does not look to be foldable?
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Old 12-08-2016, 06:17 PM   #16
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Boan,

Nicely done sir! Have you had an opportunity to test the get back engine? Did the installation of the extension make any noticeable effect on the handling or performance? Lastly are you happy with the results?

Regards,
Bob
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Old 12-08-2016, 07:06 PM   #17
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I hope that the propeller is either folding or feathering otherwise there will be a possible big problem with heat build up if prop turns all the time. Based on the nice work done I would guess it does fold or feather.
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Old 12-09-2016, 04:17 PM   #18
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For your interest I would try to tell about my experiment with M/Y Maya.

The extension (X-drive) is now completed with assistance of a wellknowned designer.
The main reason for an additional engine is the speed limits on the European canals, max 10 or even 6 km/h (5,4 or 3,2knots). Its not acceptable with hundred of hours on idling for the 6LYA-STP.
The bottom lines of the hull is extended about 3 feet and top of the swim platform about 4,5 feet. The powerline is a VP D2-40 with saildrive and Autostream feathering prop, the speed is 1-6+ knots.

The advantages are several as, safety redundancy for propulsion and steering, the floating level has approved in many ways, the steering is very good, especially in low speed and very much in reverse, with an extra controlled generator it replace my genset, the noise from that engine is almost zero (the only noise is from the control cables, motor and gearbox, its on my list). Its fantastic to run a quiet boat!

The maximum speed has not been effected, its still +14 knots. Im not missing the trimtabs.
Maya act well on raff sea, as we have here in Scandinavia, also in following sea with her dubble rudder and the S-drive (xtra pivot center) in the very end of the hull. Its easy to reach the prop from the swimladder to adjust the the pitch or just clean the prop.
I'm happy to tell that 96 holes has been closed in the aft of the hull, non facing the water left.
The X-drive is secured bolted to the hull and guite possible to replace back to the original swimplattform, but I wont.
Your question about the fuel consumption is less than half, in low speed. We pay about $8/gallon.
I dont expext this is a good investment but it was a piece of mind when I got retired. I'm very happy with her performance and we are looking forward to spend some time in the canals of Europe.
/boan

See clip on Youtube.
----------

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Old 12-09-2016, 07:17 PM   #19
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Boan400 - Regarding your post #18: Thank you for clearing up my mind. I now completely understand and give my thumbs up to your choice. Enjoy retirement!

Your Boat Buddy - Art
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Old 12-09-2016, 07:23 PM   #20
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Boan,

Thank you for your reply! The armchair critics have been proven wrong!

Cheers,

Bob
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