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Author Topic: USN 45 ft Tug  (Read 4013 times)

Pat Matthews

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USN 45 ft Tug
« on: April 19, 2009, 12:54:25 AM »

Once described as "the Navy's Cutest Tug", YTL-710 is one of the few Army 45' ST tugs assigned to the US Navy. This one was built around 1954 on a pre-WW2 design, and was documented as working in the Washington Navy Yard in the mid-80's... current disposition unknown. Original builder's plan obtained through Paddlewheels & Props in the US.

The hull is built plank on frame with a fiberglass skin. Scale is a whopping 1:10, making it 54 inches long.
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Pat Matthews
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Pat Matthews

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Re: USN 45 ft Tug
« Reply #1 on: April 19, 2009, 12:56:01 AM »

More!
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Pat Matthews

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Re: USN 45 ft Tug
« Reply #2 on: April 19, 2009, 12:57:43 AM »

whew!
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awvs

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Re: USN 45 ft Tug
« Reply #3 on: April 19, 2009, 02:55:45 AM »

Beautiful model  :-))

Wilhelm
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dougal99

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Re: USN 45 ft Tug
« Reply #4 on: April 19, 2009, 10:00:35 AM »

Lovely piece of work - bet your really proud pf her - I would be.


Looking at the picture of keel and frames it looks like the frames are glued to the keel sides in two pieces rather than slotted over as I would normally do. Is that correct or am I seeing (or not seeing) things?

Doug
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Arrow5

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Re: USN 45 ft Tug
« Reply #5 on: April 19, 2009, 12:53:29 PM »

That is a georgeous piece of work,well done that man !  Great interior and exterior  detail , lighting is super.  :-))
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Martin [Admin]

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Re: USN 45 ft Tug
« Reply #6 on: April 19, 2009, 01:14:08 PM »

That is a georgeous piece of work,well done that man !  Great interior and exterior  detail , lighting is super. 

 :-)) :-)) :-))
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Pat Matthews

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Re: USN 45 ft Tug
« Reply #7 on: April 19, 2009, 01:57:51 PM »

Looking at the picture of keel and frames it looks like the frames are glued to the keel sides in two pieces rather than slotted over as I would normally do. Is that correct or am I seeing (or not seeing) things?

Doug

Thanks!
The frames are built up as one piece each-- sides & deck beam are joined with pegs and gussets.. then, yes, the "lower" ends are merely glued to the keel.
In this way, all the location work is done by the build jig. Target locations are marked on the keel, and the frame ends can be positioned as needed.
I'm not concerned with having a mechanically locked joint there, as the framing adds minimal strength to the model. The strength is all in the hull shell-- think of how strong a fiberglass or even an vac-formed ABS hull can be, once the shell is completed with a deck-- "monocoque". Indeed, the frame is just there as a form for the planking!
To pull this off though, you really need to pay attention to edge joining the planks, and/or covering the assembly with a layer of fiberglass.

BTW, planking is 1/8 inch x 1/2 inch pine, glued & pegged to the frames, which in turn are 1/2 inch thick, and built up from futtocks... Not for strength and certainly not for convenience, but for looks (I can't stand rough plywood edges!), and to provide a wide face for pegging.
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Pat Matthews

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Re: USN 45 ft Tug
« Reply #8 on: April 19, 2009, 02:14:27 PM »

A few notes on details:
Mostly scratch built... bought the BECC flag and shadowed numbers, the Prop Shop prop, and the marvelous RB Model shackles & bottle screws.

Real glass in the windows and port lights. Working dogs on the hinged doors. Built up the ship's wheel (4 inch diameter!), and operated with a servo Y'd to the rudder... Search light is fabricated from turned parts and flashlight bits... it turns with the help of another servo and chain drive.
A number of parts were photoetched... lamp lenses were poured in clear resin from a turned master... mast is a soldered brass assembly...
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Pat Matthews
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Pat Matthews

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Re: USN 45 ft Tug
« Reply #9 on: April 19, 2009, 02:47:38 PM »

Rudder: I like to have the appropriate rudder footing built onto the hull, which makes rudder removal an issue. So... the rudder is built up with a hollow tube framework inside, including a collar with grub screw at the top. Rudder tube in the hull is done in the usual fashion... and a rudder shaft is fabricated from stainless rod. The shaft inserts through the rudder tube and rudder, and rudder is locked to shaft with the grub screw. Easy!
BTW, the rudder was sealed with glass cloth for durability.

Ballast: The model will weigh in around 60 lbs... so the battery is designed for easy removal, and the majority of the lead-shot ballast is loaded into capped PVC pipes which are easily removed from cradles built into the hull. A bit of naval engineering was needed to locate these ahead of time... the chart was developed by analysis of submerged volumes (and thus, displacement) between frames, and the ballast "task" was calculated from estimates of the bare model weight by station.
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toesupwa

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Re: USN 45 ft Tug
« Reply #10 on: April 19, 2009, 04:16:31 PM »

But Pat...

.. you didnt tell them about Toledo!...  %)
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Pat Matthews

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Re: USN 45 ft Tug
« Reply #11 on: April 19, 2009, 05:01:48 PM »

But Toes, I've never been to Spain!
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Pat Matthews
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ggeorge

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Re: USN 45 ft Tug
« Reply #12 on: April 20, 2009, 11:48:06 PM »

Hi Pat,
  Nice work and I love the scale. But I am a bit partial to the larger scale.

G. George
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dougal99

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Re: USN 45 ft Tug
« Reply #13 on: April 21, 2009, 03:18:42 AM »

Hi Pat,
  Nice work and I love the scale. But I am a bit partial to the larger scale.

G. George

So get the dividers out then or just expand the plans on a copier then post the pictures  :-)) :-)) :-))

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