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Remorqueur USS Nokomis (YT-142) Classe Woban 1:350 et 1:100 - Modèle 3D


Iceman 29

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Today I did some of the navigation lights, the bridge mast, and the lifeboat, a recycle from a previous project, which saved me some time.

 

I'll see if I can cover it with its canopy or not. I could add 2 oars.

 

The navigation lights are placed on the "upper bridge", but this was not always the case, on some, they were fixed to the railing in front of the bridge doors. 

 

Nokomis:

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Hoga:

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Drawing of the Pelorus (The Lionel Corporation, New York) azimuth compass used in the US navy at the time.

 

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In situation.

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Today's "Azimuth compasses" are no longer magnetic, at least those used on board, gyrocompass repeaters, also called taximeters, have been in use for a long time now, they indicate true north or so-called true north. 

 

The angular difference between true north and compass north (magnetic) is called gyro variation (Wg).

 

Personal photo of a taximeter (Tarragona, Spain), there are 4 of them, one in the centre of the bridge and on each wing in general. Another one is placed at the helm and autopilot.

 

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Magnetic North has moved a lot and is still moving, it has never been so close to true North (since it was calculated at least).

 

4 centuries of tracking magnetic north:

 

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The speed of movement of the North Magnetic Pole, which was on average about 11 km per year, suddenly increased from 1985 to reach nearly 56 km / year in 2005.

 

Since then, the speed has been decreasing and is expected to reach 40 km/year around 2025. Or not.

 

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I'm coming to the end now, I'm trying to erase all the small defects when possible and to draw small details.

 

Here the navigation lights, the foghorn, improvement of the stern tube connection, sacrificial zinc anodes etc..

 

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Small fire drill this morning. :)

 

It took me a while to find this style of fire cannon in pictures. This model is still made in China, in 1:1 scale, a classic on ships since more than 70 years. 

 

The only difference is that it can project physical foam now, thanks to an ejector integrated in the gun.

 

I still have some corrections to make. 

 

I've made a pleasure to detail the gate valve, it can be used for other ships/impressions. 

 

An example at 1:1 scale

 

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The fire cannon will be placed on the top of the bridge of the tug.

 

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A little doc on the various marine valves:

 

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1 hour ago, Iceman 29 said:

I've made a pleasure to detail the gate valve, it can be used for other ships/impressions. 

The fire cannon will be placed on the top of the bridge of the tug.

 

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That's a globe valve under the water cannon in the photo, not a gate valve as you've drawn it

I've seen gate valves used for isolating sections of fire main for maintenance purposes, but where you're needing valves for operational purposes they're globe valves for quick opening/closing.

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Good point Dave, I'll draw one. 👍

 

In place: 

 

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The USS HOGA (right) alongside the battleship USS Nevada on December 7, 1941. The HOGA is shown fighting the fire in progress aboard the battleship immobilized. National Archives photo 80-G-19940.

 

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2 hours ago, Dave Swindell said:

 

That's a globe valve under the water cannon in the photo, not a gate valve as you've drawn it

I've seen gate valves used for isolating sections of fire main for maintenance purposes, but where you're needing valves for operational purposes they're globe valves for quick opening/closing.

 

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2 hours ago, Dave Swindell said:

Working your way through the Econosto catalogue? That and the IMPA catalogue were never far from my office computer!

 

@Dave - Not for this plan, it comes from an English-French dictionary specific to the merchant marine. There are a lot of drawings, very practical.

But the idea is good for IMPA which I used for 20 years to order on board to shipchandlers the consumables needed to run the ship every month or month and a half. A real bible!

I still have a less cumbersome PDF version. I'll have a look at it.

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1 hour ago, Killingholme said:

Wow. I'm sure a lot of people of said it before, but if you found a good resin caster to team up with, you've got a business there- I can imagine a good international market for detailed standard US Naval fittings such as these. 

 

Will

 

Tks Will!

 

I don't have the courage to get into all this at my age. 🙄

 

Now I just want to enjoy life, my family, friends and do what I want, when I want. As few constraints as possible. Time flies.😉

 

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I was not sure about the shape of the cannon's lance at that time. It appears to have several setting cones on the end probably to set the cannon to the pressure pump.

 

I just found this image, it will allow me to modify.

 

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15 minutes ago, Iceman 29 said:

I was not sure about the shape of the cannon's lance at that time. It appears to have several setting cones on the end probably to set the cannon to the pressure pump.

 

I just found this image, it will allow me to modify.

That looks like an extension tube, reducer and a jet nozzle all connected with ANSI couplings, the period photo's look more like a purpose designed water cannon nozzle. Both appear to be for just water, but there may have been a requirement for the ability to swap between water and foam depending on requirements, which would require different nozzle design and size. 

A large nozzle would give a large volume jet over a shorter range vs a smaller volume over a larger range for the same pump pressure.

49 minutes ago, Iceman 29 said:

@Dave - Not for this plan, it comes from an English-French dictionary specific to the merchant marine.

Econosto is a large Dutch/European valve manufacturer - their catalogue is full of useful valve drawings and specs - standard issue in the C/E's office!

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Preparing a test print of the waterline hull, a first for me. It requires a little preparation in terms of drawing, including a good classification of the different parts.

 

I'm only printing the hull for the moment, the fittings will be printed separately. This will allow me to check the fitting of the 2 parts for the 1/100 in full hull.

 

First we have to make a cut! :)

 

The ship is 87 mm long at 1:350.

 

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I printed it vertically last night, it came out very well. I hollowed it out with Chitubox and made holes to connect its compartments, to avoid any suction phenomenon that would damage the surface.

 

The print is very good, the details are well rendered.

 

I will try a 5° print of the hull to see.

 

And another one at 20 microns / 38 microns hz with the Phrozen mini 4K printer instead of 50 with the mono X.

 

The advantage of the grey boats is that they are almost mono color, so you can print the elements together. Which is not a problem to paint them.

Some small rough pictures.

 

I'll try printing at 5 degrees later: 

 

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à 90°:

 

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I broke the rudder when I was unstuck, but I'm going to glue it back together. The connection with the hull is very fragile.

 

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  • Iceman 29 changed the title to Tug Boat USS Nokomis (YT-142) Woban Class 1:350 & 1:100 - 3D

I'm trying a print this way, as planned. 1 hour of printing against 6 hours for the vertical solution, we'll see who wins in terms of the advantage/disadvantage ratio of the method in the end.

 

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It printed well that way, better than vertically anyway.

 

I've got a bit of tearing at the bulwark at the front, nothing serious, a rectification to be done maybe.

 

The starboard steering wheel did not print correctly, that was to be expected.

 

The boat printed very well, many details are well represented, others will be replaced by PE, ladders (although they are perfectly printed), railings.

 

I had removed a lot of details, I will put back the fire gun, I still have a searchlight to draw too, it will print. The one of the loading mast was torn off during the printing, I will reinforce its support a little thin for 1/350.

 

At 1/200 ( To accompany the Hornet CV-8) and 1/100, it will be at the top! 

 

Conclusion, I did not expect such a result, frankly. Very happy with this project. I'll be able to use it for ST type tugs by replacing the castle and by putting the hull at the right size for these smaller tugs, 4 meters less.

 

Class and type Type 327-A Small Tug
Displacement 212 tons
Length 26 m (85 ft)
Beam 7 m (23 ft)
Draft 3 m (9.8 ft)
Propulsion 800 hp (597 kW) turbocharged diesel engine

 

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