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 Dumas US Army 74' Tug

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barriew
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PostSubject: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptyThu Sep 10, 2020 2:10 pm

Dumas US Army 74' Tug Dscn1768 Dumas US Army 74' Tug Dscn1769

This is my next project! If you read my log for building the Dumas Chris Craft 24 ft Sedan you may be surprised I bought another Dumas kit lol!  Well, I did think more than twice about it, but it is a model of a type of ship I wanted to build, and the length is manageable. However, it will have a few challenges Rolling Eyes  There is some balsa in this kit, but not as much as in the other. It also seems a little harder. There is also a sheet of laser cut ply and three of die cut expanded polystyrene. The hull is vac formed plastic, but what plastic I don't know - ABS possibly. According to the comprehensive instructions normal epoxy style glues and fillers wont stick to it.

Dumas US Army 74' Tug Dscn1771

As well as a full instruction book, there are 72 illustrations.

First job is to remove the excess plastic from the hull. In fact not all is removed at this stage. A flange is left to assist in joining the two halves. In the photo the front half has been trimmed.

Dumas US Army 74' Tug Dscn1770

After clamping the two halves together, glue is run into the joint on the inside. the flange will be removed later, so you are only gluing as small area. To strengthen the joint, glass fibre tape is stuck over the joint using thin CA. It seems  to work Shocked

Dumas US Army 74' Tug Dscn1772

This is where I hit the first problem. The two halves did not meet up correctly along the whole hull. Around the stern one half was shorter than the other. I could find no way of making them align correctly, so I joined them leaving the problem to be sorted with filler after the hull was in one piece. I tried to photograph the problem, but there is too much white lol!

I do have to resolve this on the outside before I can proceed to drill the hole for the prop shaft. I am not using the one in the kit Shocked  This consisted of a steel shaft, threaded and drilled at one end and a plain piece of brass tube the exact dimension of the shaft - no bearings. The prop was fixed by inserting a pin in the hole then tightening the prop onto it with a nut. Rolling Eyes  I have replaced it with a slimline M2 from Caldercraft.

I have added a sliver of plastic card and some filler to re-shape the area for the prop shaft. After more bodging tomorrow I should be able to drill the hole.

Barrie


Last edited by barriew on Fri Sep 11, 2020 2:12 pm; edited 1 time in total
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davidjt
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptyThu Sep 10, 2020 3:11 pm

hi barrie,
this looks very interesting  study well and fix once no going back  Laughing  i  hope it all works out better in the end, and should look great.

david
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barriew
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptyThu Sep 10, 2020 7:34 pm

Thanks David. I think that bit will turn out OK - its underwater anyway so wont be seen lol!

Barrie
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barriew
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptyFri Sep 11, 2020 2:05 pm

I'm still bodging the stern, but have done enough to install the propshaft and rudder tube.

Dumas US Army 74' Tug Dscn1773

As you can see these have been sealed with P40. I am hoping this will stick firmly to the glass strip.

I have also stuck on the deck supports - using super glue.

Dumas US Army 74' Tug Dscn1775

I dry fitted the deck and you can see the problem

Dumas US Army 74' Tug Dscn1774

I don't understand why the deck supports don't go to the end - they were specifically to be only 16'5 inches. Shocked  So I decided to extend them Rolling Eyes

Dumas US Army 74' Tug Dscn1776

and now the deck is stuck down

Dumas US Army 74' Tug Dscn1777

Next job is to finish bodging the stern and remove the remainder of the flange.

Barrie
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Swab
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptyFri Sep 11, 2020 5:42 pm

I have a liking for the Dumas Dauntless but this and your Sedan build has put made me ponder leaving it.
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barriew
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptyFri Sep 11, 2020 6:55 pm

Dumas have some interesting models, BUT they use some strange materials. I have no problems with the hull, and the deck seems to be OK, but liteply would have been just as good. The quality of the strip wood for the bearers was not good - cutting the slots left lots of stringy bits. Not an issue where they are fixed, but would be a problem if they were visible on the finished model.

Barrie
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Swab
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptyFri Sep 11, 2020 7:49 pm

I'm watching this one because I'm slowly building up to buying a hull and plan set so this fits in well with my learning so in the nicest way - get on with it! Razz
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barriew
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptyFri Sep 11, 2020 8:53 pm

I think you will find that I usually build pretty quickly - in fact much too quickly, despite only spending about a couple of hours a day.

Barrie
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Swab
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptyFri Sep 11, 2020 9:11 pm

I take it the hulls vac formed? How thick is it (roughly)?
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barriew
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptySat Sep 12, 2020 7:13 am

According to the booklet 0.040 inches. I haven't checked it.

Barrie
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Swab
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptySat Sep 12, 2020 11:17 am

Proper measurements! that's accurate enough thank you.
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barriew
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptySat Sep 12, 2020 1:51 pm

Swab - checked a bit of offcut this morning - 0.8mm. I know what you mean bout proper measurements. I still think in Imperial, but find it much easier measuring in mm rather than fractions of an inch. Rolling Eyes

This morning I removed the tab round the remainder of the hull, and replaced it with a strip of the expanded polystyrene stuck with super glue - I've never used so much superglue on a model. Shocked Shocked

Dumas US Army 74' Tug Dscn1778

You can see from this shot that the misalignment at the stern carried through to the bulwarks.

Dumas US Army 74' Tug Dscn1780

That is being filled. Finally this session I stuck some rubber moulding to the stem.

Dumas US Army 74' Tug Dscn1779

When I've finished filling and sanding the stern, the same rubber goes all the way round, and two more strips partway along.

Barrie
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barriew
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptySun Sep 13, 2020 2:10 pm

Dumas US Army 74' Tug Dscn1782 Dumas US Army 74' Tug Dscn1781

A very fiddly morning Rolling Eyes Getting the rubber mouldings on was a challenge, mainly because they had been rolled up causing kinks and twists which were difficult to remove. I actually tried using a hair dryer to warm it up and make it easier. Its not perfect, but it is to be painted the same colour as the hull, so may not look too bad. Just an example where a little thought about packing the item would have simplified the use.

Next up were the coamings. This is how they tell you to fit them

Dumas US Army 74' Tug Dscn1783

No doubt a very accurate way of fitting them, but pretty wasteful as the support strips have to be removed once the coamings are glued Shocked Shocked I managed without using them Rolling Eyes
Next the fantail. The supports were fitted to the deck, then the fantail itself was made using 1/8th wide styrene strips o the polystyrene base. It just needs trimming.

Dumas US Army 74' Tug Dscn1784 Dumas US Army 74' Tug Dscn1785

Tomorrow its trim the fantail, then fit the capping strips and cut the freeing ports, which are covered with flaps, which make the cutting out rather pointless lol!

Barrie

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barriew
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptyMon Sep 14, 2020 1:46 pm

A bit of a disaster this morning Shocked  I started to trim the ends of the fantail strips and they kept flying off. Rolling Eyes  Then I realised I had tried to stick them on with liquid polystyrene, and the base is polythene Embarassed Embarassed
Two solutions presented themselves - re-stick with superglue, or cut a new base from plasticard. Wishing to avoid more superglue on my fingers I opted for the latter Rolling Eyes This has now been completed and sanded to fit.

Next job was the cappings. I wasn't happy about gluing these to the edge of the hull which is less than 1 mm thick. I find these cappings can take a lot of punishment when handling the model. I glued some 1.5mm square styrene down most of the hull to give a more substantial gluing surface, then stuck the cappings to that. These were laser cut from thin ply and I think the laser had not been correctly adjusted as the was a lot of ash on all the edges. The final piece of capping is ready to be trimmed and fixed down.

Barrie

Dumas US Army 74' Tug Dscn1786
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barriew
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptyTue Sep 15, 2020 1:38 pm

Dumas US Army 74' Tug Dscn1787

The last piece of capping was trimmed and fixed, and a piece of plasticard added to the front of the fantail. The piece supplied was not deep enough, so I cut a piece from stock.

Next up - cutting the freeing ports. Having cut them, they were then covered Shocked  Rolling Eyes  Shocked  Rolling Eyes

Dumas US Army 74' Tug Dscn1788

The instructions suggest now is a good time to paint the hull, but I think I will leave it for now. I want to experiment with painting the rubber strips. The instructions state that Testors enamels will work, so I want to try Humbrol enamels.

Onto building the superstructure - from Balsa Rolling Eyes

Barrie
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barriew
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptyWed Sep 16, 2020 2:00 pm

The framework for the superstructure is balsa bounce  It is then clad in 1mm expanded polystyrene. This means more superglue Rolling Eyes  I've never used so much superglue to build a model.

Dumas US Army 74' Tug Dscn1789 Dumas US Army 74' Tug Dscn1789

This base unit is now trimmed and finished. Next up is the roof - more polystyrene with some balsa bits.

Dumas US Army 74' Tug Dscn1790

After taking this photo (its not fixed down) I discovered that my attempt to work in inches and fractions had failed Shocked Shocked Shocked  I had mis-calculated the centre line. Rolling Eyes Rolling Eyes  So all the balsa has to come off. Embarassed Embarassed  I'm not sure if I can re-use the actual roof, if not I will cut one from plasticard. The balsa bits can be re-made from scrap. I do intend to give the balsa frames a coat of resin to try and stiffen them. I may even clad with plasticard the bits of them that hold the structure in place round the coamings.

I had to go to Aldi this morning and picked up a spray can of matt grey paint. I will do some tests to see if it will cover the black rubber. If its not the correct colour it will do as an undercoat.

Barrie
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barriew
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptyThu Sep 17, 2020 2:00 pm

I managed to salvage the roof. After removing the balsa I scraped it down and its now re-usable. The areas that had the parts in the wrong place will not show once the model is finished. After the remedial work it was on to the next challenge - fitting some plastic strip to the edge of the roof Rolling Eyes  Obviously the only glue is CA, so the challenge was to stick the strip but not the fingers lol!

Dumas US Army 74' Tug Dscn1810

The forward steps were built up from balsa, ply and plastic strip. They don't fit very well, and will need attention once the glue has dried.

Dumas US Army 74' Tug Dscn1811 Dumas US Army 74' Tug Dscn1812

Next job is to fit and detail the many doors to the sides of the superstructure.

Barrie
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barriew
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptyFri Sep 18, 2020 1:57 pm

Nine doors fitted and detailed this morning, and the stairs adjusted and glued in place. The doors were quite fiddly, and without engaging brain before starting, I managed to fit several on the wrong side of the doors, so had to remove and re-do. Embarassed Embarassed

Next in the build manual is to make the railings. I expect I will follow the sequence, but may skip that for later. Rolling Eyes

Barrie

Dumas US Army 74' Tug Dscn1814 Dumas US Army 74' Tug Dscn1815 Dumas US Army 74' Tug Dscn1813
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barriew
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PostSubject: Re: Dumas US Army 74' Tug   Dumas US Army 74' Tug EmptyToday at 12:58 pm

Yesterday I made and fitted the grab rails for the cabin. I also cut all the brass for the handrails. The instructions include a detailed plan for these together with instructions for building them. I followed these and apart from being a bit wasteful of the brass, they worked very well.

Dumas US Army 74' Tug Dscn1816 Dumas US Army 74' Tug Dscn1817

The first photo shows some of the railings before soldering. Here are the finished items after trimming excess brass.

Dumas US Army 74' Tug Dscn1818

I then gave the hull and cabin a spray of grey acrylic primer which I managed to buy from my local petrol station Rolling Eyes

Dumas US Army 74' Tug Dscn1820 Dumas US Army 74' Tug Dscn1819

The hull seems to have come out OK, the cabin not so good. Its difficult when your nose is dripping and your wearing a full face mask Rolling Eyes Shocked Rolling Eyes Shocked Rolling Eyes Shocked

I have to decide if I am going to leave the upper parts this colour or if it needs painting a lighter grey.

Barrie
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