Author Topic: SDM Mark I  (Read 22504 times)

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sea monkey

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SDM Mark I
« on: April 14, 2013, 20:11:48 »
My last project (2 ATBs) took much longer than I had planned and towards the end I had already started to think about the next one. Usual story – short attention span, easily distracted.
This time it’s a 1/50 MkI SDM – Seabulk’s St John from Florida.
There are a few models of the MkII boats, Umi and JPCat have a couple of beauts, but not many MkI models.
Considering how little reference there is of them I’m not surprised. There were 4 built: Suwanney River, New River, Escambia and St John. They are all basically the same with minor differences to fittings, stacks, etc. None of them looks ‘as built’ anymore.


sea monkey

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Re: SDM Mark I
« Reply #1 on: April 14, 2013, 20:17:49 »
I got the basic hull shape from a pdf of the Barcelona MkIIs.
This needed to be modified to be 50% deeper to hold 2 Graupner ASD units. I was a bit disappointed with the units as they are very toy like and have been known to break. They don’t look to good either but I’m not about to built them from scratch so they’ll have to do.
The deeper hull raised 2 issues.
The hard chine hull looked like an oven dish so I decided to replace the hard edges with a smooth curve.
At 545mm(L) x 310mm(w) x 80mm (d) the hull displaces a lot of water so ballasting down to the waterline could be tricky.
From above it looks like a big dinner plate.

sea monkey

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Re: SDM Mark I
« Reply #2 on: April 14, 2013, 20:44:56 »
So... day one and then about 2 months later with the hull resin coated and undercoated. Still a few rough spots to fill and sand.
Putting in the bulwark supports using a piece of lego in a jig to make sure they are all square.

sea monkey

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Re: SDM Mark I
« Reply #3 on: April 14, 2013, 20:51:59 »
Having trouble with the images loading, try again tomorrow.

sea monkey

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Re: SDM Mark I
« Reply #4 on: April 16, 2013, 20:05:48 »
Try again!

sea monkey

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Re: SDM Mark I
« Reply #5 on: April 16, 2013, 20:20:21 »
The site doesn't seem to like photoshop files.
Anyway... The hull construction was quite straightforward. The straight sides are 2mm ply and the round ends are balsa sandwiched between ply ribs. 3 coats of resin/sanding/filler/primer and it's almost OK. The simple curve of the hull sure shows up any irregularities. Plenty of access room for the motor and electronics.
Next step was the bulwark braces, lined up square and perpendicular with a jig – the lego is smooth and square on all sides.
96 more to go... laser cutting takes away all of the boring work. The angle of the bulwarks change as the get further away from the ends. Each braces was a slightly steeper angle and shorter from the one before it.
« Last Edit: April 16, 2013, 20:53:33 by sea monkey »

sea monkey

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Re: SDM Mark I
« Reply #6 on: April 16, 2013, 20:40:45 »
Once the braces were all in place I used segments of thin cardboard taped together to make a rough pattern for the bulwarks around the braces. This provides the basic shape for the 0.8mm ply bulwark sheathing. Requires a little sanding to get the bottom flush with the deck – the top can be sanded down to the level of the braces later.
I usually use 2 layers of ply cut out of the sheet at 90º from each other and the second layer glued on after the first layer has been attached. It's surprisingly strong.
« Last Edit: April 16, 2013, 20:54:16 by sea monkey »

sea monkey

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Re: SDM Mark I
« Reply #7 on: April 16, 2013, 20:57:25 »
When the sides had been attached I put in the remaining braces (not required structurally) and cut out a strip where the freeing ports would be.

tugs53

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Re: SDM Mark I
« Reply #8 on: April 18, 2013, 15:05:04 »
Nice work sir...and a great build thread.
 
Keep up the postings :)
MIKE

sea monkey

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Re: SDM Mark I
« Reply #9 on: April 21, 2013, 18:59:27 »
Still not letting me post any pics – 'failed security' message.
Starting to be annoying. Anyone got any ideas?

tugs53

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Re: SDM Mark I
« Reply #10 on: April 22, 2013, 09:57:33 »
I've got the same problem angry
 
I'm hoping our TugMaster can sort this out. angel
MIKE

VANYA

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Re: SDM Mark I
« Reply #11 on: April 23, 2013, 01:43:16 »
Sea Monkey.

Hope you are going to paint them Red, Wellington colours.

You might also need to decal the deck with the words  bow and stern!

Not only have UFO's been seen off Kaikoura....now in Wellington. Great work.

Looks like my brother is building a Kupe for old times sake.

Just working on my springer. Better finish something before October I guess.

Hayden :)
VANYA

TWCFI

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Re: SDM Mark I
« Reply #12 on: July 12, 2013, 06:51:36 »
That could be my favorite tug of all time.  Great shape with a: " I can push, tow, run-over anything I want, and I still have space on my deck for recliners and a cooler when I am done doing it" attitude to it.

Very nice build!  Will definitely watch this thread.

Bob

sea monkey

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Re: SDM Mark I
« Reply #13 on: July 14, 2013, 18:51:16 »
The build is progressing but I can't post pictures any more due to the "security" warning.
I'll try another method.

sea monkey

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Re: SDM Mark I
« Reply #14 on: July 14, 2013, 19:27:46 »
Try this time