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Author Topic: Dumas Mr Darby - My build  (Read 26883 times)

oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #50 on: October 03, 2015, 01:05:38 PM »

I have one prop/shaft sort of in place.



A question ... should the shaft alignment be parallel with the bottom of the hull? This one is not quite there at the moment and needs just a tad more filed out of the slot.

Tom
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rhavrane

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Re: Dumas Mr Darby - My build
« Reply #51 on: October 03, 2015, 03:07:48 PM »

Bonjour Tom,

I am not a specialist but I was always told that the propeller shaft should be parallel with the water (horizontal), not with the botton of the hull.

If the bottom of your hull is horizontal...  ok2

I hope other modelists will confirm my opinion


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RaphaŽl
RaphaŽlopoulos Steam Lines UnLimited
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Mad Scientist

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Re: Dumas Mr Darby - My build
« Reply #52 on: October 03, 2015, 10:27:37 PM »

Yes, for a typical working vessel, the shaft is horizontal - or close to horizontal.

In the case of high-speed boats (such as pilot boats or fast patrol craft), the shaft points downward, to help with the vessel's trim at speed.

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #53 on: October 03, 2015, 10:30:47 PM »

Thank You for the replies. As far as I can tell I can have the shafts level and still have lot's of leeway inside for motor mounting. I will know in a day or two.

Tom
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Capt Podge

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Re: Dumas Mr Darby - My build
« Reply #54 on: October 03, 2015, 11:31:47 PM »

It's difficult to tell from the photo Tom, but just make sure the blades of the prop don't foul against the hull as you near the horizontal.
 
Regards,
 
Ray.
 
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #55 on: October 04, 2015, 11:22:13 AM »

Thanks for the reminder Ray. As it sits at the moment there is about 1 1/2" clearance, but one I take the slight angle out, there will be around 1".

I now need to make the rudders so I can fit them and then get the final length of the stuffing tubes.

Thanks

Tom
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Brian60

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Re: Dumas Mr Darby - My build
« Reply #56 on: October 04, 2015, 12:09:28 PM »

an inch clearance seems quite a lot? Bigger prop {-) or I would try and re-angle the shaft to reduce the gap. Usually there would some type of skeg at the rear to support the shaft like this image or a 'A' frame of some sort.

oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #57 on: October 04, 2015, 04:12:30 PM »

Brian, I have a pair of 3 1/2" props at the moment and it would cost me $100.00 the pair for a set of 4" ones (at current exchange rate for the USA). It is far easier and cheaper to  just cut the slot deeper.

Yes, there is either a skeg type support for each shaft, or a pair of "A" arms to support the shafts. None of that is done as I haven't made the rudders which will determine where the props go.

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #58 on: February 13, 2016, 12:34:05 PM »

I am happy to say that I am finally able to get back to this build. I have tested some motors and they should have all the required power. I am building the battery tray and machining the motor mounts at the moment.

Cheers

Tom
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rhavrane

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Re: Dumas Mr Darby - My build
« Reply #59 on: February 13, 2016, 01:23:12 PM »

Bonjour Tom,
If you have not definetely fixed the propeller shaft yet, another possibility is to use wheel gears to allow the shaft to be in the bottom of the hull, example at 3'50". Plastic ones are less noisy than metallic ones.



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RaphaŽl
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #60 on: February 13, 2016, 05:00:17 PM »

Hello RaphaŽl.

The shafts are now permanently in the hull. I have a huge amount of room in the hull and the 24 volt motors will have more than enough room.

I looked at some of your videos ... very nice indeed. I love the tug pulling you in the dingy and that is wahat I am hoping to be able to do with my tug.

Cheers

Tom
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rhavrane

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Re: Dumas Mr Darby - My build
« Reply #61 on: February 13, 2016, 07:54:00 PM »

Bonjour Tom,
Of course, electric engines are easier to manage than steam plants ! Sorry, I had forgotten this "detail"  :o

And I am sure you will be able to pull heavy launches or dinghies, I know my Moulay-Idris powerful by ITSELF, but please have a glance HERE and THERE when it fights against electric tugs... And thank you for the compliment  :-))
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RaphaŽl
RaphaŽlopoulos Steam Lines UnLimited
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #62 on: February 14, 2016, 10:35:27 AM »

Hello  RaphaŽl

Thank You for the video links. It is interesting to watch how different tugs can pull. It is also nice to see so many model boats out for a day in the sunshine.

Cheers

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #63 on: February 14, 2016, 11:31:08 AM »

We have propulsion ... well ... propellers anyway. Some filling and sanding to do yet but at least something done.

Cheers

Tom
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ballastanksian

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Re: Dumas Mr Darby - My build
« Reply #64 on: February 14, 2016, 02:43:29 PM »

She looks good Tom.
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #65 on: February 16, 2016, 05:59:12 PM »

Thanks ... I only hope I have them in straight! One minute they look fine and then the next time I look the seem to be crooked. I am going to get another model boater to look at them.

I just ordered my P94 controller from Action and it should be here in a week or two.

Cheers

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #66 on: February 18, 2016, 03:56:33 PM »

A question for the brain trust here ... What sort of thing would be used for sealing and waterproofing bare wood these days. The stuff I used to use is no longer acceptable to elf and safety in this country. I am looking for something thin, that soaks in easily. I need to do the skeg and prop shaft supports on the outside, and eventually, all of the wood bit of the house works.

Cheers

Tom
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JimG

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Re: Dumas Mr Darby - My build
« Reply #67 on: February 18, 2016, 09:21:32 PM »

I like to use brushing epoxy, used by aeromodellers for wing skinning with glass cloth. It is thin and will soak into the wood, even better if it is thinned further with alcohol. As well  as waterproofing it gives a harder surface to the wood. I often add some microballoons to the epoxy which gives a surface finish which will sand smooth with only one coat.

Jim
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #68 on: February 19, 2016, 11:14:33 AM »

Thanks for the info Jim.  I will have a look 'round and see if any of the local shops have anything like that.

Cheers

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #69 on: February 22, 2016, 11:55:00 AM »

Another question for the brain trust ... I am looking for couplers for my prop shafts. In looking around the net I came accross something called a "safety coupling". They appear to be two bits of turned brass with a bit of plastic tube in between them and held from spinning on the shafts with a bit of brass wire. Does / has anyone use these couplers and would they work on something as big and powerful as a Darby type tug? I see that Mobile Marine sell them as well.

Cheers

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #70 on: February 22, 2016, 10:50:06 PM »

My P94 arrived today so I need to read up on it, do the cuts on the case and give everything a test run.
Cheers

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #71 on: February 27, 2016, 10:44:07 AM »

Well. this week has been the old two steps back trick. I spent many hours looking at my installation of the prop shafts/tubes and in the end I realized there was nothing for it but to yank them out and redo them. It was a bunch of work, but I think they are correct now.

In the course of the redo, I also decreased the clearance between the prop tips and the hull. It is just a bit less than 1/2" now. Also, Ontario suffers from heavy weed growth in most of the small lakes and it makes it easy for a boat to get caught up on them. To that end, I have installed solid supports for the prop shaft instead of the "a" arms. This should also give some extra protection from submerged stumps etc.

I have the case for the P94 mostly cut out to suit and I am going to work on a test board next week.

For them moment I shall start making the rudders and getting them put in.

Cheers

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #72 on: February 27, 2016, 02:30:26 PM »

I just acquired this winch for a large tug boat. Apparently it came in kit form at one time and it used the parts from a Penn fishing reel to make it all work.

Does anyone out there know anything about these? What # of Penn reel it needed to get the proper parts?

It looks to be of good quality and I will use it whether I can get the spooler working or not.

Also a quick pic of the newly installed prop tubes. Quite a bit of sanding and filling to do on them when I get the rudders and skeg in.

Cheers

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #73 on: March 07, 2016, 10:39:43 PM »

Just a quick update ... the parts for the winch are on their way from Texas.

I have the parts of the rudders glued up and they will dry overnight and the profiling can begin.

I have cut the 1/8" ply for the rear deck frame and now I can start to trim and sand and trim and sand and trim and sand .... untl I get it all to fit just right.

Cheers

Tom
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oldflyer2

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Re: Dumas Mr Darby - My build
« Reply #74 on: November 28, 2016, 10:56:33 PM »

Well, after several delays, health issues and just plain didn't want to do it, I am back on Darby. I was going to make the belt drives, but it just wasn't worth it so I ordered a couple.

Once they are here, I can get on with some stuff.

The deck crane is ordered.

Bow thruster ... this boat is 45" long and will weigh 65lbs or so ... what size will I need? Pipe diameter and motor size? Roebesh seems good but some reports say they break a lot and are under powered. I always fancied making one but I have no idea of size.

I will be doing a winch as well ... double drum I think.

Mare in a bit.
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