Author Topic: 1970s Diesel Harbour Tug 'RANGI'  (Read 15809 times)

0 Members and 1 Guest are viewing this topic.

sea monkey

  • Site Supporter
  • Admiral Poster
  • *
  • Posts: 1088
Re: 1970s Diesel Harbour Tug 'RANGI'
« Reply #15 on: April 23, 2016, 23:00:46 »
Not up to museum standard I'm afraid but each one seems to be getting a little easier to build than the previous one.
Have to secrete them around the house as my wife can't seem to understand why we need any more.
Anyway back to the build.
Managed to get the hull finished, undercoated, wet & dry polished as smooth as a baby's bum, and prepped for painting.
Added some anodising plates although I guessed at their placement as the only photos i have seen of the boat out of the water are when it was being repainted and the plates had been removed.

sea monkey

  • Site Supporter
  • Admiral Poster
  • *
  • Posts: 1088
Re: 1970s Diesel Harbour Tug 'RANGI'
« Reply #16 on: April 23, 2016, 23:10:09 »
Also added some details to the hull.
I had brass etched some fender tie loops. They are 2 separate pieces the hull plate and an eye that slots into it and through the hull ply.
Worked out OK. I attached the bases for the bow and stern fender straps.
Don't worry about the rough finish inside the fender housing, it will be hidden by the rubber fender.

sea monkey

  • Site Supporter
  • Admiral Poster
  • *
  • Posts: 1088
Re: 1970s Diesel Harbour Tug 'RANGI'
« Reply #17 on: April 23, 2016, 23:22:00 »
And scribed out the outline of the ASD hull section. The ASD plate has rounded corners in a square cut hole in the hull.
You'll never get to see these lines but at least I'll know that they are there.
Now ready for the paint job.
Over the years the 2 tugs have had several colour schemes. The hulls have always been mid blue and the superstructure white but the decks have been pale grey, pale blue, light blue and the same blue as the hull. The bulwarks have been white, hull blue, pale blue and light blue.
The funnels have been white, hull blue, dark blue and yellow.
Plenty of options to choose from. I'm tending towards pale blue decks and bulwarks (yes, that happened) and yellow stack.

VANYA

  • Sr. Member
  • ****
  • Posts: 440
  • Ships need tugs.
Re: 1970s Diesel Harbour Tug 'RANGI'
« Reply #18 on: April 24, 2016, 00:31:31 »
Nice Steve.

The historical OHB clour have been dark.Royal blue with yellow I think.

They painted the tugs more recently that lightler blue but did not like it so much.
VANYA

sea monkey

  • Site Supporter
  • Admiral Poster
  • *
  • Posts: 1088
Re: 1970s Diesel Harbour Tug 'RANGI'
« Reply #19 on: May 02, 2016, 14:59:36 »
Thanks Hayden.
This next part the ASD drives, was quite easy. I thought that I might have a try at 3D printing so I drew up the drives and tried to convert them into a 3D modelling program. That's harder than it sounds unless you're a tech savvy teenager. The initial 2D drawing was easy, knocked it out in Indesign in about 20 minutes. After much trial and tribulation battling with a 3D program (another battle lost in my continual struggle man versus machine) I eventually sent it to a 3D specialist and he cranked it out in about 20 minutes.
Then off to Shapeways. For a test run I chose strong, white and flexible, hit 'print' and waited. Nothing turned up for 3 months, apparently it was lost in transit somewhere in Brussels. The help team at shape ways where very helpful and re-printed the file., however for some reason the file kept hitting a print error and failing and the final stages of printing. After a minor file adjustment and a change to polished, strong, white and flexible, the finished products arrived. 2 weeks from ordering to delivery in New Zealand not bad. The finish is a bit rougher than I had anticipated and the material doesn't handle sanding too well. Not bad for a first attempt, and nothing that can't be fixed with a few extra layers of paint.
« Last Edit: May 02, 2016, 15:30:43 by sea monkey »

sea monkey

  • Site Supporter
  • Admiral Poster
  • *
  • Posts: 1088
Re: 1970s Diesel Harbour Tug 'RANGI'
« Reply #20 on: May 02, 2016, 15:12:59 »
Getting the props printed at the same time was quite cost effective. Getting 2 brass props sent from Europe would have cost 4 times as much as the total cost of printing both drives and props.
I hadn't been able to find any pictures of the ASD drives on the actual boats, and as is always the way, the day after the drives arrived from Shapeways Vanya sent me a great photo of the Karetai in dry dock, with the drives in full view. Bugger!
I had made my main shafts cylindrical while the real ones are much more elliptical and only have 2 fixing points. They are almost like small rudders or vanes in front of the drives.. But if I hadn't just told you no-one would ever know. I'm sticking with my cylindrical versions as I can't really afford or be bothered reprinting them. Better luck next time.
After a few coats of undercoat and some extra layers of top coat they look OK. The props even spin freely. I'm satisfied with the result and know how to improve next time.
« Last Edit: May 02, 2016, 15:30:14 by sea monkey »

sea monkey

  • Site Supporter
  • Admiral Poster
  • *
  • Posts: 1088
Re: 1970s Diesel Harbour Tug 'RANGI'
« Reply #21 on: May 02, 2016, 15:15:32 »
... a couple more for good measure.

2tugboats

  • Moderator
  • Hero Member
  • *****
  • Posts: 609
  • Roughly 3/4 inch scale semi accurate
    • Two Tugboats
Re: 1970s Diesel Harbour Tug 'RANGI'
« Reply #22 on: May 02, 2016, 21:17:00 »
Extra fine Steve. I am very impressed with your tackling the drive gear and
making it look great. And, I learned a lot about mounding my next fender work.
Thank you Steve, great posting and all.

Michael
Yet another case of why men and women go down to the sea in ships. . .A pleasure to be here and smell the salt air. Thank you Tugboat Forum. . .Michael in Anacortes, Washington www.twotugboats.com

sea monkey

  • Site Supporter
  • Admiral Poster
  • *
  • Posts: 1088
Re: 1970s Diesel Harbour Tug 'RANGI'
« Reply #23 on: May 04, 2016, 16:32:07 »
Thanks Michael.
In the end I decided to go for the mid blue decks and bulwarks. The OHB didn't use this scheme for long and it tends to camouflage the vents and deck equipment but that's how it is in several of the photos I have.
So now the basic hull is completed and I can move on to the superstructure.
The bow bull's eye isn't attached yet, just there for the photo. I'll leave the deck equipment and fendering till later and I always leave applying the hull markings and name until the very last thing sort of signing it all off.
Plenty to do before then.

sea monkey

  • Site Supporter
  • Admiral Poster
  • *
  • Posts: 1088
Re: 1970s Diesel Harbour Tug 'RANGI'
« Reply #24 on: May 04, 2016, 16:33:04 »
... more

sea monkey

  • Site Supporter
  • Admiral Poster
  • *
  • Posts: 1088
Re: 1970s Diesel Harbour Tug 'RANGI'
« Reply #25 on: May 04, 2016, 16:34:21 »
still more

sea monkey

  • Site Supporter
  • Admiral Poster
  • *
  • Posts: 1088
Re: 1970s Diesel Harbour Tug 'RANGI'
« Reply #26 on: May 04, 2016, 16:35:48 »
... a couple more.
The flash has made the deck colour appear yellower than it is. The colour in the first of this series of posts is correct.
The deck will have another few coats of clear satin once the deck equipment is installed.

sea monkey

  • Site Supporter
  • Admiral Poster
  • *
  • Posts: 1088
Re: 1970s Diesel Harbour Tug 'RANGI'
« Reply #27 on: May 04, 2016, 16:43:57 »
And finally, a question for any Otago boys out there: Keith, Antipodes, Simon, Hayden, Delboy?
What are these?
Is it a valve of some sort behind the door? The only photos I have all have the door open and obscuring whatever it is.
And what is the safety valve/cut off towards the stern and what would the text around it say?

VANYA

  • Sr. Member
  • ****
  • Posts: 440
  • Ships need tugs.
Re: 1970s Diesel Harbour Tug 'RANGI'
« Reply #28 on: May 06, 2016, 08:32:06 »
Steve.
The item in front of the door is just a recess where the shore power connection is made with a heavy duty 3-phase socket. You can see a little of the cable in black.

The aft area of interest is a vent open/shut handle. Obviousy something to do with air suppression in time of fire etc.

Hb
VANYA

sea monkey

  • Site Supporter
  • Admiral Poster
  • *
  • Posts: 1088
Re: 1970s Diesel Harbour Tug 'RANGI'
« Reply #29 on: May 14, 2016, 12:54:19 »
Thanks Hayden,
You're right about the shore power socket (only on the port side). The lever at the stern is the emergency fuel cut-off. One on each side. Got the answer from forum member Antipodes who is the OHB chief pilot. I'm sure I'll be asking a lot more questions as I only have limited reference of the boats.
In the meantime I've been making slow progress. The hull is pretty much completed and I'm happy with the paint job, only a couple of minor touch-ups required.
Now onto the superstructure.
I had the basic form laser cut and in theory it should have slotted together smoothly and quickly. In fact it took ages and quite a bit of interior bracing. I used ply 50% thicker than probably needed and had had it cut with the grain running the wrong way it's 3 ply so bends better one way than the other. Getting it to comply to the curves required lots of cross bracing to bend around. I think I ended up with as much glue on me as on the wood. Once constructed I was able to cut out some of the excess bracing.
Here are the basic carcasses.
« Last Edit: May 14, 2016, 13:04:21 by sea monkey »