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OTW NACKEN BUILD HMS Neptun

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Re: OTW NACKEN BUILD HMS Neptun

Postby tsenecal » Fri Jun 13, 2014 1:43 pm

D

Cornwall Model Boats is where i buy mine.

you get a choice of red plastic parts or black plastic parts:

http://www.cornwallmodelboats.co.uk/aca ... dular.html

http://www.cornwallmodelboats.co.uk/aca ... lings.html

use the "link spindle" to tie two of the u-joints together. both sets give you the ability to pick and choose which motorshaft and propshaft inserts you use.


you will want to replace the grub screws with stainless

http://www.mcmaster.com/#grub-screws/=se5bce
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Re: OTW NACKEN BUILD HMS Neptun

Postby dhffr » Fri Jun 13, 2014 2:50 pm

Thanks....


I rarely order from the UK. How are shipping costs with them?


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Re: OTW NACKEN BUILD HMS Neptun

Postby tsenecal » Fri Jun 13, 2014 3:35 pm

D

the shipping costs and times for Cornwall are basically identical to those from china. I'm a cheapskate, so i always use the slowest/cheapest option... 10 to 15 days, and $10 to $15.00. I never order just one part. always get a box of multiple props and shafts and couplings. oddly enough that is all i have ever ordered from them. propshafts, couplings and props for 6 boats and almost 5 subs.

Tim
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Re: OTW NACKEN BUILD HMS Neptun

Postby dhffr » Sat Jun 21, 2014 7:44 pm

Cornwall has everything I need in the red. Are they as beefy as the black ones? The black one I have does not say Raboesch on it so I think it is the same as the red.



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Re: OTW NACKEN BUILD HMS Neptun

Postby Sub culture » Sun Jun 22, 2014 2:36 pm

The red ones are usually Ripmax or Huco couplings. The splines, dimensions and strength are the same however.
'Why are you staring at an empty pond?'

Want to dive your boat in crystal clear water? Then you had better Dive-in- http://www.diveintomodelsubmarines.co.uk
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Re: OTW NACKEN BUILD HMS Neptun

Postby profesorul » Sun Jun 22, 2014 3:36 pm

I am very pleased about Cornwall and Postal Fees to my door (ROMANIA) was : 4,80GBP (way my keyboard for GBP symbol wont work :x !?!?!?)

Not to mention they whore more than understanding with me , considering that I ordered wrong a product and have changed ...... it is true that he had not been sent yet at that time but steel :D

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Re: OTW NACKEN BUILD HMS Neptun

Postby tsenecal » Sun Jun 22, 2014 4:54 pm

D

i own considerably more of the red than the black... and neither has given me any problem.

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Re: OTW NACKEN BUILD HMS Neptun

Postby dhffr » Sun Jun 29, 2014 7:35 pm

WTC mounting finished and all linkages are done. Ready for a float and trim test. Just need to pick up an inflatable pool to start trimming.

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Re: OTW NACKEN BUILD HMS Neptun

Postby dhffr » Sat Jul 05, 2014 6:26 pm

I finally got the Neptune in the test tank today. Surface trim done in about 5 minutes. Submerged trim within a half hour. Fastest one I have ever done.
First shot is leak testing the tube. 3rd shot is of the steel bars I used. Came out of some workout ankle weight belts. (local pool says "NO LEAD") Sprayed them and the blue foam with Plastidip. It really does a good job of preventing rust. It also seals the foam up better and makes everything black. Very clean......Final shot is the finished periscopes and tower. Just a few details to do in the bridge area.(electronics, zincs, etc...)


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Re: OTW NACKEN BUILD HMS Neptun

Postby dhffr » Sun Jul 06, 2014 12:05 am

Here is the final surface trim at about 95% full tank. Tail heavy like they used to run them on the surface. Also started cleaning up for final paint.

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Re: OTW NACKEN BUILD HMS Neptun

Postby Ralph --- SSBN 598 » Sun Jul 06, 2014 1:21 am

Beautiful work.

I would be careful with making the tail a little low.
I believe that the low stern is cause by hydrodynamics pulling the stern down when moving forward due to the hull shape.
Once the boat submerges the effect is in all direction and not just down balancing the boat's trim under water.

I see another research project.
I will no doubt start looking for photos showing the Nacken running on the surface and standing still ..... maybe next to the dock.
I am sure you have already done the research.

Again, very nice work.
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Re: OTW NACKEN BUILD HMS Neptun

Postby dhffr » Sun Jul 06, 2014 3:08 am

At rest and running, the tail is generally low based on about 20 photos I have. Looking at the photo, it's a bit higher than the actual trim when I set it up.
If I don't like the way it runs, I will just put a couple ounces up front and cut out some foam. No big deal.


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Re: OTW NACKEN BUILD HMS Neptun

Postby Ralph --- SSBN 598 » Sun Jul 06, 2014 10:17 am

I don't see it as an issue either.

I also wonder if the photos showing the bow high might be that those boats where not loaded with torpedoes or other weapons that would be up front.
I have been collecting photos of the Gotland as well as two drawings from Kockum.
Some show the boat tied tot he dock and the upper stern plane tips are exposed showing the Zinc tip bars.

Gotland and Södermanland
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And under way, the Uppland
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These boats are not the same class.
The Nacken is an A-14 boat and the Gotland is an A-19 boat.
Nacken is 144.4' and the Gotland is lengthened to 198'.
-------------------
At the Fun Run in June, I saw a few boats with the internal piston ballast tank.
Your Nacken looks like it also has the same type piston tank.
Is this a build it yourself item or is it available?
Is there a build log on it?
That system looks so clean.
In operation I watch one of the other boats hold periscope level for almost the complete run.
It didn't matter whether the boat was under way or sitting stationary in the water.
Control was remarkable.
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Re: OTW NACKEN BUILD HMS Neptun

Postby dhffr » Sun Jul 06, 2014 10:53 am

Ralph,

Slight rise in this photo. Just about where mine actually sits.

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Re: OTW NACKEN BUILD HMS Neptun

Postby Ralph --- SSBN 598 » Sun Jul 06, 2014 11:22 am

I saw that photo.
I can't tell if at the stern if that's a plane tip showing at the water surface or just wake turbulence.
It does look like all the deck lower drain holes are exposed back to the rear draft marks.

I am looking in amazement of your abilities and asking questions.
None should be taken as criticism.
I am no where near your level of building.
As I get older, I find I don't have the patience to work on the smaller parts.
I also find that I glue my fingers together more often.
Got to get hand cream and maybe some rubber gloves to try.
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