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Author Topic: Dumas Mr Darby - My build  (Read 26027 times)

Butts

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Re: Dumas Mr Darby - My build
« Reply #75 on: November 29, 2016, 03:28:27 PM »

I guess it depends what you want to do with your tug as to what bow thruster you will need.
I have a 49" tug with the biggest of the Raboesch thrusters fitted (the one with two brass props).  At best it turns gently.  It is also very noisy  Maybe you could argue it runs a scale speed.
My working tugs have home made thrusters with brushless motors and racing propellors.  They are based on 42mm plumbing pipe with a 3" prop shaft running through the tube.  There have been a number of threads on here showing that design.  It works really well for competition use, but you could argue it is far quicker than any real vessel would achieve.

mike_victoriabc

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Re: Dumas Mr Darby - My build
« Reply #76 on: November 29, 2016, 04:07:02 PM »

Hi Tom
Looking at your winch - think this might have been made by someone on the island here - looks similar to one I acquired a few years ago. Will see if I have photos of it on a tug. Where did you find this one? Mike
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #77 on: November 29, 2016, 04:55:12 PM »

Thanks Guys

Butts, I will look for a build thread. I don't want to be able to turn on a dime. I just want it to look realistic and throw out some water. This won't be a competition puller as there are no competitions anywhere near here that I know of. I have heard several comments about the Roebesh thrusters not living up to expectations.

Mike, the winch is a Ron Burchet one. I am working up a design for a two drum one.

Tom
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mike_victoriabc

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Re: Dumas Mr Darby - My build
« Reply #78 on: November 29, 2016, 05:41:22 PM »

Mine came from him as well. Will look for a photo of the motor setup.
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #79 on: December 03, 2016, 10:27:48 PM »

OK, so I have done some work on the skeg. It is a framework covered with a ply skin. Once the one side is skinned and the cover sheet is on, I will cut out most of the inner frames and fill the interior with led shot to add some stern weight. Once the deck is on, there is not that much room left to add weight if needed.

I have attached some pics of what I have done.

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #80 on: December 04, 2016, 03:05:23 PM »

Some of the frames are now out and I have done a rough "fill em up and weigh" test. Disappointing at only 1.5 lbs, but I guess that is better than an empty air space that would want to lift the hull up.

That might help a wee bit with stability

Tom.
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #81 on: December 05, 2016, 07:46:21 PM »

Done and taped in place until I decide if I want to make a heavier one or not.

Anyone have an idea if it is worth the trouble to do a heavier one or not? Do any of the competition type tug drivers out there have an opinion or used a weighted bottom like this?

Filling and sanding to do yet.

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #82 on: December 09, 2016, 01:29:31 PM »

The skeg is glued into place and I am working on my rudders now. I have the blades just about done and the parts that glue into the hull and are roughed out, the tube inserted, and glued and the epoxy is curing as we speak. I will sand them to profile, and then cut the holes in the hull for them.

Once the rudders are in, I will start some of the clean up work on the bottom and get that bit all ready for a good coat of primer.

You can see that I extended the centering marks beyond where the larger holes will be. That way, when I expand the holes, I will still have reference points. Don't ask how I know this.

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #83 on: December 10, 2016, 02:09:34 PM »

While I was out yesterday, my drive systems from Harbor Model showed up but needed a signature. I will go to the post office on Monday and retrieve them. Once I am done with the rudders, I will start on making a mount and installing the drive assemblies. Once that is done, she will be waterproof for now and water testing (friend has an indoor pool) can begin.

The rudder stubs that go through the hull are glued up and dry so I can start to profile them tomorrow.

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #84 on: January 25, 2017, 11:25:39 AM »

It's been a while. I haven't been doing much in the shop but I have been trying to learn to use the 123D drawing program.

I managed to draw and print a rudder support and rudder for this build. I will have a go in the next week to install them in the hull.

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #85 on: January 25, 2017, 06:49:23 PM »

Forgot to post the pic, but at this point it appears it is all immaterial as I just did an experiment and fiberglass resin or bondo won't stick to the pla.

Oh well, more recycle scrap.
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #86 on: February 06, 2017, 04:15:01 PM »

This build has come to an end. Unfortunately, I had some sort of "episode" in the shop, and fell down, landing on the hull that I had knocked off of the bench. The hull is toast, but other than a couple of cuts and bruises, I will be OK.

Tom
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Brian60

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Re: Dumas Mr Darby - My build
« Reply #87 on: February 06, 2017, 06:48:09 PM »

Somethings are not meant to be Tom, its karma. I know my current build has thrown up so many problems of late that I feel like intentionally damaging it beyond repair - a different scenario but same result.

Hope you recover from your fall without any pain except the damage to the tug.

Umi_Ryuzuki

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Re: Dumas Mr Darby - My build
« Reply #88 on: February 06, 2017, 07:17:59 PM »

Good to hear you are okay after such an incident.
Perhaps a query around the web might turn up a hull somewhere.

Tug-Kenny

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Re: Dumas Mr Darby - My build
« Reply #89 on: February 06, 2017, 08:04:24 PM »


 So sorry to hear that Tom.  I'm glad you're alright though.  I can imagine how you feel.

Box up all the parts and pieces and you might come back to it with fresh eyes. 

All the best

ken


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ballastanksian

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Re: Dumas Mr Darby - My build
« Reply #90 on: February 06, 2017, 08:32:02 PM »

I am so sorry to hear that, but like everyone else, I am pleased that you were not badly hurt. Definitly box it up and stow it away for a year. have a practice on the old 3D business, try out a few Resin friendly Reprap filaments and then get back to it with fresh heart.

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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #91 on: February 06, 2017, 10:54:47 PM »

Thanks Everyone. The bits are in a box and under the bench for now, but I have my doubts.

I won't be in the shop for a while so I might feel different when I return.

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #92 on: February 07, 2017, 07:06:56 PM »

The bits have been picked up by a friend that does fiberglass repairs to full size boats. He said he will have a go as he likes a challenge.

Cheers

Tom
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ballastanksian

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Re: Dumas Mr Darby - My build
« Reply #93 on: February 07, 2017, 08:16:39 PM »

Well that is a great bonus! I hope he manages to sort it out and get you back on track with your enthuiasm undiminished Tom.
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