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Author Topic: MMM Portgarth build  (Read 120706 times)

T33cno

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Re: MMM Portgarth build...... Main deck washport dilemma
« Reply #350 on: April 24, 2017, 09:01:42 PM »

By May I'm looking forwards to gluing the decks and clearing out the washports again BUT
It keeps striking me that MMM have marked the main deck ports as two long ones whilst the real vessel has a short a long and a short.
This bothers me but what do you think?

Actual
http://www.marinetraffic.com/en/photos/of/ships/shipid:190379/#forward

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captain bligh

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Re: MMM Portgarth build
« Reply #351 on: April 24, 2017, 09:21:44 PM »

Do as the real boat because that is what your building a scale model of.
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T33cno

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Re: MMM Portgarth build
« Reply #352 on: April 24, 2017, 09:23:02 PM »

Do as the real boat because that is what your building a scale model of.
Exactly how I feel so why would MMM stray from that blatantly? I cannot see a reason for it.
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T33cno

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Re: MMM Portgarth build
« Reply #353 on: April 24, 2017, 09:55:14 PM »

We need MORE pictures like this. I may have to pay a visit and take some proper photos.
I'm going to be asking "how do I reproduce those securing bands around the fender" ??????? %)

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tugmad

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Re: MMM Portgarth build
« Reply #354 on: April 24, 2017, 10:14:38 PM »

Exactly how I feel so why would MMM stray from that blatantly? I cannot see a reason for it.




It is quite possible that the drawings the model was originally made from was the builders original design general arrangement.  which gets altered as the vessel is built,
Things get altered all the time when ships are being built, so the modeller if wanting an Exact copy of the real thing needs to do at least some research into the subject.you will probably find that the general arrangement which must be displayed aboard has several differences to the actuall ship.
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T33cno

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Re: MMM Portgarth build
« Reply #355 on: April 25, 2017, 06:03:05 AM »

Good answer thanks  :-))
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Butts

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Re: MMM Portgarth build
« Reply #356 on: April 25, 2017, 08:16:49 AM »

Andy, I'm not sure what design you are planning for your winch, but I think you will need a much lower gearing than those motors you have. 
My winch (admittedly untested on a new boat) has a gearing of 3000/1 which will give a turn speed of about 5 turns per minute. Lower gearing will tend to spool out when under tension. 
Also remember if you use it for competition tug towing you are only allowed to spool in or out to adjust your line length, not to actually winch the vessel.

T33cno

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Re: MMM Portgarth build
« Reply #357 on: April 25, 2017, 09:22:11 AM »

Depending on the size of your drum 5 turns per minute might only take out 1" of slack which is far too slow
I think it really needs to be able to take up at least a foot in minute or less.


Will a 360 degree rotation servo run either way? I wonder ??



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T33cno

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Re: MMM Portgarth build
« Reply #358 on: April 25, 2017, 09:42:02 AM »

I wish MMM wouldn't cast these peg holes in each half as both fittings bow and maindeck have one side well off centre  :((


I'm sure it was intended to help but it's not if it's not in the middle and would be much easier to drill it after assembly

The one on the right as pictured here

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Butts

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Re: MMM Portgarth build
« Reply #359 on: April 25, 2017, 10:16:39 AM »

Depending on the size of your drum 5 turns per minute might only take out 1" of slack which is far too slow
I think it really needs to be able to take up at least a foot in minute or less.

That's why I have a 7'' drum circumference.

T33cno

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Re: MMM Portgarth build
« Reply #360 on: April 25, 2017, 12:18:45 PM »

That's why I have a 7'' drum circumference.


 {-)  I don't think I have room for that
I'm at the experimentation stage and don't even have a drum yet  {:-{
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derekwarner_decoy

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Re: MMM Portgarth build
« Reply #361 on: April 25, 2017, 12:59:54 PM »

Some very sound advice and no nonsense comment there Butts  :-))...obviously from a mature vintage  ok2....... Derek

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Butts

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Re: MMM Portgarth build
« Reply #362 on: April 25, 2017, 01:49:10 PM »

Cheers Derek. You're right of course about the "mature vintage" :} .


Andy, my drum is only 6.5cm in diameter which is not that large and the hull it is in is a 1/25 scale Damen Stan 2208 - so slightly smaller than a Portgarth

T33cno

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Re: MMM Portgarth build
« Reply #363 on: April 25, 2017, 02:29:44 PM »

Pictures would be helpful  :-))
I'm limited as to where I can put it in the hold
Most likely on the underside of the main hatch
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poll

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Re: MMM Portgarth build
« Reply #364 on: April 25, 2017, 02:38:05 PM »

Depending on the size of your drum 5 turns per minute might only take out 1" of slack which is far too slow
I think it really needs to be able to take up at least a foot in minute or less.


Will a 360 degree rotation servo run either way? I wonder ??

 Hi Andy.
 Slow on the winching in & out, If to fast you get it balled up round the drum , would not like to say I told you so, been there & done it.
 
 John                Balne Moor mbc
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T33cno

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Re: MMM Portgarth build
« Reply #365 on: April 25, 2017, 03:06:09 PM »

Thank you  :-))


Parts materials pictures sketches all welcome pleez  %%
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ballastanksian

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Re: MMM Portgarth build
« Reply #366 on: April 25, 2017, 08:00:27 PM »

There is an article in this month's Model Boats by a chap (Francis Macnaughton) who uses 'Continuous roatation servos' as combination ESC/Drive motor for small model boats.

While the ones he uses are not for heavy loads, you may find there are bigger ones with more poke available. They are used for computer controlled robots and if available, a larger one might do for your winch and allow variable winding speeds:O)

The link for servos is www.rapidonline.com

Otherwise, searching for 'Continuous roatation servos' may give you more options.
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T33cno

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Re: MMM Portgarth build
« Reply #367 on: April 25, 2017, 08:39:40 PM »

Thanks Ian. I've already bought a continuous one for trials when I have time  :-))


More pictures, we like pictures don't we children  :}


I've managed to re drill the Lead and tap it 6mm for long brass bolts. Unfortunately on assembly I found the holes for the crossbar are too low for this set up so had to fill them in and re drill higher  <*<











So I now have a nice handle for removing the hatch  8)





Thanks again for the switch advice. This is now in place and the engine access hatch will be sited over it  :-))


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T33cno

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Re: MMM Portgarth build
« Reply #368 on: April 25, 2017, 08:43:49 PM »

I'd like to forgo a bit of building time this weekend and visit Balne moor for a plunge  8)   What would be the best day considering it's bank holiday weekend?


Kirklees will be CLOSED due to tour de Yorkshire
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Kevgarth

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Re: MMM Portgarth build
« Reply #369 on: April 25, 2017, 09:22:42 PM »

Interesting build you've got there T33cno.
I thought I'd send you photo's of my Portgarth winch please excuse the dust??? The winch was fabricated out of thick wall brass tube and other sections of brass and silver/soft soldered together and like yours its bolted through the deck. I've also attached a few others of my model which was built back in 2002 and uses Graupner schottle drives, there's a few more photo's of it on the modeltugforum site if your interstered.
The great thing with building this model was the full size vessel is based here in Bristol which is a darn sight a lot closer than the present tug I'm building at present MIDDLESBROUGH.
Keep the good work up and thanks for sharing your build with us.


Kevin
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Kevgarth

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Re: MMM Portgarth build
« Reply #370 on: April 25, 2017, 09:26:29 PM »

Here's two more of my Portgarth model taken down at a very cold Roath Park last March.


Kevin
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T33cno

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Re: MMM Portgarth build
« Reply #371 on: April 25, 2017, 09:27:32 PM »

Thank you ever so much! you're straight on my buddy list  {-) :-))
This is the kind of thing I was hoping for! picture sharing and awesome ones too  8)
I don't think I can replicate that but appreciate it.
I can see the bow fenders are attached using cable ties  :-))  I had this in mind but now I see it is doable  :-)
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Kevgarth

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Re: MMM Portgarth build
« Reply #372 on: April 25, 2017, 09:36:00 PM »

Yeah I used plasticard strip and they just split and not with use or hitting against as there under no real tension.


Kevin
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T33cno

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Re: MMM Portgarth build
« Reply #373 on: April 25, 2017, 09:45:11 PM »

Do your mast lights all work? Your mast is closer to reality than the MMM plans so I'd imagine wiring yours would be exceptionally difficult?
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Kevgarth

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Re: MMM Portgarth build
« Reply #374 on: April 25, 2017, 10:17:47 PM »

I've sent you a PM T33cno


Kevin
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