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Author Topic: Strongbow type tug  (Read 2744 times)

Online Paddlemex

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Re: Strongbow type tug
« Reply #75 on: May 07, 2019, 03:32:47 AM »

She has seen the water for the first time and liked it.
I marked the waterline on the hull and then made the ballast test in the tub.
I marked two lines: one at 92mm draft (as per the drawing) and another at 87mm, 5mm less.
At the 87mm line the lowest paddle is just covered by the water. The pencil lines on the hull are barely visible on the second picture.
At the 87mm line it required 9.83kg of ballast. I didn't add more weight but it will be about 1 or 1.5 kg more to reach the 92mm line.
So the estimates we had made were quite close.
In the second to last picture are the ballast pieces I used. I had packed the very rusty pieces in plastic bags to avoid getting more dirt than necessary into the hull.

Last picture shows the rivets on the rudder. I used the "anchored" glue blob technique. I drilled a 1mm bore about 1mm deep, then mixed some epoxi and with a toothpick placed a little drop in the bore.
Unfortunately they are not perfectly aligned, the drillings looked OK, but it seems that the epoxi flowed unevenly. No action scheduled to correct this.

Jurgen



Offline derekwarner_decoy

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Re: Strongbow type tug
« Reply #76 on: May 07, 2019, 08:25:21 AM »
Agreed Jurgen.....

You will certainly need that additional ballast to bring her down the extra 5 mm.....so to minimize cavitation of the wheel blades

You may have mentioned hull weight to date  :whistle, but what is the total displacement [weight] required to bring the hull draft to this of 92mm?

Derek

PS....all those chunks of metal + the Good Wifes digital kitchen :shhh scales, sure do make ship building easier
« Last Edit: May 07, 2019, 11:32:18 AM by derekwarner_decoy »
Derek Warner

Honorary Secretary [Retired]
Illawarra Live Steamers Co-op
Australia
www.ils.org.au

Online Paddlemex

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Re: Strongbow type tug
« Reply #77 on: May 08, 2019, 12:43:15 AM »
the Good Wifes digital kitchen scales,

What do you mean Derek? Are you suggesting that ..    I would never
OK, got me, I used it. How would you know, did you spy on me? I knew it was a bad idea to install Alexa.

And regarding the weight of the hull. I forgot about that.  ::) :P 
Weight of the hull is 1.05kg. So we are at just over 11kg. Even closer to the estimate.
Add to that whatever it requires to get the additional 5mm of draft.

Jurgen

Online Paddlemex

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Re: Strongbow type tug
« Reply #78 on: May 17, 2019, 03:17:49 AM »

Some progress here. Parts are coming together.
I made the decks and glued the sponsons.

I stained the decks but I am a bit concerned that I went too far. But anyway, I want a used coal burning tug and not a cruise ship.

Jurgen

PS. Damien: Sorry to read about your Volcano. Before binning her you might have asked if some one was interested to adopt her, postage paid. The hull looked beautiful.
Good luck for your new projects.

Offline derekwarner_decoy

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Re: Strongbow type tug
« Reply #79 on: May 17, 2019, 08:11:14 AM »
Jurgen...before you glue the deck down, you may wish to consider

1. a light coating [sloshing] of thin glassing resin to each and every inner hull surface between each frame. This will strengthen the entire hull structure immeasurably
An option here is to cut glass tissue into strips and bed down into the resin between each frame to make it unbreakable  :crash

2. the underside of the deck must also be coated now, as you will never get the practical chance later......you may also choose either a polyurethane coating a traditional varnish or glass resin. This will also dictate they type of adhesive you use to glue the deck to the hull framework

Pretty sure the Strongbow plans showed coaling scuttles on deck......so you could experiment [on a scrap of wood] with some graphite powder around the scuttles to simulate spilt coal dust before you seal the upper deck surface

Derek
Derek Warner

Honorary Secretary [Retired]
Illawarra Live Steamers Co-op
Australia
www.ils.org.au

Online Paddlemex

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Re: Strongbow type tug
« Reply #80 on: May 18, 2019, 01:35:33 AM »

Thanks for the comments Derek. It's always nice to count on external observers who help to avoid forgetting stuff which is difficult or impossible to fix later.

The inner hull has received 2 coats of a PU marine floor finishing resin some time back. That should do it. I didn't glass the interior because the hull was glassed on the outside. It wouldn't have been too difficult to put some glass in while PUing, but it's too late now.

The decks are already glassed on the underside. I had some resin crawl to the top without noticing it. That's why there are some clear spots on the deck because the stain wouldn't penetrate the wood there. Will deal with that later.

I will still coat the deck supports (the whitish wood in the pictures) before gluing the decks to the hull.

Interesting point is the coal scuttles. I have no idea where they loaded the coal into the bunkers. The plans don't mention any coal feed openings and an afternoon of googling didn't enlighten me either. I found some drawings that show the coal bunkers to be located midships at both sides of the engine room, but no hints to how or where they were filled.

Jurgen

Offline derekwarner_decoy

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Re: Strongbow type tug
« Reply #81 on: May 18, 2019, 08:01:56 AM »
Jurgen......here are the coal scuttles on Strongbow, 2 each...Port & Stdb...... but behind the wheel box's you don't see much.....the are on a steel floor so again a little graphite powder before the final seal would be OK......

I think traditionally the scuttle lids were a heavy cast iron and a 1/8 twist/turn to unscrew then a T bar to lift off the deck......

Derek
Derek Warner

Honorary Secretary [Retired]
Illawarra Live Steamers Co-op
Australia
www.ils.org.au

Online Paddlemex

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Re: Strongbow type tug
« Reply #82 on: Today at 02:49:55 AM »

There they are, Derek. Thanks.
I had searched the drawings and didn't see them. Proves again how helpful the additional eyes in the forum are.

But they are hidden behind the wheel housings. It must have been a pain to load there. Looks like they had to carry the coal in buckets by hand or with a trolley at best to get to the scuttle lids. Ergonomic design looks different.

Don't know if I will include them on the model. They are hidden too much.


 

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