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Author Topic: Neptune - next scratch build  (Read 2219 times)

Dr.Schmidt

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Neptune - next scratch build
« on: March 24, 2016, 11:28:05 PM »

I already have posted some drawings of my fantasy boat project, which is loosely based on a 209 type. This is a project that I'm slowly starting right now. After the extremely complex U-1 and the still very complex Nautilus build, the modelers heart longs for something much more simple. This is going to be it...a small boat with WTC, single screw, no milled parts (with exception of the hull masters). 

It's going to look somewhat like that:






I'll kick off with the WTC. All very simple. The structure parts were 3d printed. I'll make silicon moulds based on them and then cast PU parts. The dice system will use a peristaltic pump and an inflatable rubber tank.

This si the design::



And the first 3d parts arrived today....they are green because I ordered them on St.Patrick's day and green plastic was cheaper that day ;-)



Bajonet catch fits tight:



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ballastanksian

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Re: Neptune - next scratch build
« Reply #1 on: March 25, 2016, 05:30:20 PM »

Oh to have had more foresight at how 3d drawing etc would progress in twenty years :((

Excellent rendering and initial parts Dr.
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Dr.Schmidt

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Re: Neptune - next scratch build
« Reply #2 on: April 01, 2016, 06:30:38 PM »

And here we go: To make reproduction easy I want to cast the structure parts using PU resin. Therfore I have to make silicon moulds from the masters. Glue the masters to a flat board, frame.....



Cover everything in 2K silicon.....



and we have a mould.



And the first cast parts.



Couldn't be easier.

Moulds for the front and back bulkheads are next.
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ballastanksian

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Re: Neptune - next scratch build
« Reply #3 on: April 01, 2016, 09:05:01 PM »

Crikey, had you shown them to me without the mould being visible I would have said they were injection moulded. Lovely work Dr.
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Dr.Schmidt

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Re: Neptune - next scratch build
« Reply #4 on: April 03, 2016, 03:38:53 PM »

As promised, the silicon moulds for the front and aft bulkhead are done, and the first parts are cast:







The bajonet catch fits tightly:





The counterpart is already glued into the WTC tube:



And complete:



Next is the inner structure...
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ballastanksian

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Re: Neptune - next scratch build
« Reply #5 on: April 04, 2016, 08:59:28 PM »

It is like the mechanism from a gadget in a James Bond film! I like the bayonet system.
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Dr.Schmidt

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Re: Neptune - next scratch build
« Reply #6 on: April 04, 2016, 09:06:33 PM »

Well, a quick snap together of the inner structure:



The end plate of the peristaltic pump has been trimmed to fit the PU cast supports:



Everything is held together by two 4mm diameter GRP rods and a 5 mm diameter brass tube, which also serves as water intake for the pump:



Well, basic inner structure done in about 1 hour - had worse deals than that: 

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Dr.Schmidt

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Re: Neptune - next scratch build
« Reply #7 on: April 08, 2016, 06:55:02 PM »

During the week I glued together the part of the inner strcuture. The pump is screwed to the support frames. Behind it sits the pump controller on a 2 mm thick GRP board. The free space will hold the rubber sack for the water. Then the LiPos and behind them the two servos for the aft planes.

 







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Dr.Schmidt

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Re: Neptune - next scratch build
« Reply #8 on: April 16, 2016, 05:43:08 PM »

Slowly everything falls into place. The dive controller is screwed in place and I started wiring the whole thing:



The hoses are hooked up. The overpressure switch is new, not the one I got with the controller, as latter was too big. The new one fits tightly into place below the dive controller. The hose to the pressure switch starts in a T nipple and is routed over the pump motor to ensure that no water reaches the switch. And it looks cool....



The battery rest on two 2 mm thick GRP planks:

 

This way the battery can easily be fixed with cable ties:



The gap between battery the GRP deck has the advantage, that in case anything gets wet, the battery can easily dry. And the gap is well suited to route cable ties to fix additional gear:

 

e.g. the receiver. It will simply sit on top of the battery: 

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Dr.Schmidt

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Re: Neptune - next scratch build
« Reply #9 on: June 30, 2016, 10:05:05 PM »

Well, as the guy who milled the masters for my other boats doesn't have the capacity to mill the masters for this boat, I looked and found a new one and will give him a try. I'll be wiser in a few weeks. The final result should look somewhat like that:

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ballastanksian

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Re: Neptune - next scratch build
« Reply #10 on: July 01, 2016, 04:01:36 PM »

I love your well thought out layouts Dr! I am glad to see you have clamped the pipes onto their journals. I hope your new engineer does a good job.

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Re: Neptune - next scratch build
« Reply #11 on: July 05, 2016, 12:25:08 PM »


First pictures of the masters:








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Dr.Schmidt

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Re: Neptune - next scratch build
« Reply #12 on: July 06, 2016, 02:15:00 PM »

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Dr.Schmidt

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Re: Neptune - next scratch build
« Reply #13 on: November 28, 2016, 08:09:32 PM »

Found some time during the last weeks to make some moulds......

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Martin [Admin]

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Re: Neptune - next scratch build
« Reply #14 on: November 28, 2016, 08:15:29 PM »


Looking good dude!   :-))
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ballastanksian

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Re: Neptune - next scratch build
« Reply #15 on: November 28, 2016, 09:09:26 PM »

Crikey Dr, you do not hang about! Interesting to see the masters being machined.
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Re: Neptune - next scratch build
« Reply #16 on: January 05, 2017, 12:57:57 PM »

  I haven’t been lazy building, just lazy making photos of the build. Therefore, without many intermediate steps the current status of the Neptun build, my little fantasy boat.
 
The moulds are done and I laminated the first set of grp parts from the first boat. The rest is a bit of resin and 3D-printed parts. The prop is from the Prop Shop:
 

 

 

 

 
 
Neat little boat. Just the lower rudder is missing in the pictures.
 
The deck is removable. The WTC ha progresses quite far:
 

 
The rear part of the WTC is locked into two horizontal pins, which are glued into a grp bulkhead. Similar but vertical pins lock the deck into place:
 

 
The bow section of the WTC is secured with a single M$ screw. Right in the front an additional vertical pin for the deck positioning:
 
 
The stern tube was installed within 5 minutes:
 

 
1,5 mm thick grp sheets provide additional alignment of the deck. The bulkhead in the bow section will hold the watertight servo for the bow planes:
 

 
Thanks to 3d-printed parts from Shapeways the interfaces between the planes and the hull are perfect without the need for filling and grinding:
 

 
Same for the bow planes:
 

 
The sail is modern and simple:
 

 
 
 
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ballastanksian

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Re: Neptune - next scratch build
« Reply #17 on: January 06, 2017, 08:04:39 PM »

Is the torpedo shaped protrusion on the upper sail side the aerial deployment system?

She looks lovely. She looks like the sort of boat that an armaments firm would make for smaller navies, perhaps with an advanced diesel electric set up.

 
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Dr.Schmidt

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Re: Neptune - next scratch build
« Reply #18 on: January 08, 2017, 12:37:49 PM »

It's a fantasy boat, so not everything must have a real funtion. But most of the stuff is more or less lended from 209, 210 and ULA class subarines from Thyssen Krupp.

The potusion on top of the sail e.g. is adopted from an ULA class boat:


The things on the side are inspired by a 209:



The hull and sail dimensions are roughly taken from a 209/Prevez class sub, but I altered the lines to make it look mire elegant (well, in my view):


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ballastanksian

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Re: Neptune - next scratch build
« Reply #19 on: January 08, 2017, 06:25:59 PM »

Excellent.
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