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Author Topic: MMM Portgarth build  (Read 120704 times)

tugnut

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Re: MMM Portgarth build
« Reply #75 on: March 26, 2017, 07:03:52 PM »

Very smart  :-)) :-))
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T33cno

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Re: MMM Portgarth build
« Reply #76 on: March 26, 2017, 07:06:32 PM »

Very smart  :-)) :-))
Thanks for the encouragement  :-))
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ballastanksian

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Re: MMM Portgarth build
« Reply #77 on: March 26, 2017, 11:27:52 PM »

It is annoying when you see asymetry, it plays on your mind every time you see it. Lovely work so far. I am sad to see the vast difference in quality of resin casting in one batch as well. Mixing resin needs to be done with care as sir bubbles can be a biffer to remove without a pressure vessel to cure the castings in.

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T33cno

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Re: MMM Portgarth build
« Reply #78 on: March 27, 2017, 06:57:11 AM »

Thanks  :-) :-))
Yes the bulwark around the bow is also drunk
There are no templates in the pack for the anchor ports either  :((
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T33cno

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Re: MMM Portgarth build
« Reply #79 on: March 27, 2017, 08:06:59 AM »

Another flea in my bonnet is the Eze stern tubes
They send them assembled but the first thing you need to do is knock them apart  >>:-( to fit the Korts
Is it just me or is that a bit lacking in fore thought?
For your information they are no longer threaded but a tight interference fit
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chipchase

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Re: MMM Portgarth build
« Reply #80 on: March 27, 2017, 08:59:24 AM »

Just read your Portgarth build, your making a great job. pity about the crap hull and nozzle only bought off them once years ago, good luck with the rest of your build  :-)) 

T33cno

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Re: MMM Portgarth build
« Reply #81 on: March 27, 2017, 09:11:18 AM »

Thanks I'll make a good tug out of it but I won't buy another sight unseen
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Stumps

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Re: MMM Portgarth build
« Reply #82 on: March 27, 2017, 10:08:41 AM »

Morning T33

Great build and I'm looking forward to following this one.

Can I be nosy and ask a couple of question about your motors? Are they off the shelf items or taken from car heating systems etc.?
It's just that I'm looking at possibly building a tug myself and need to source a couple ~ something I haven't done for more years than I like to remember. But in those day you just popped down to the local scrapyard and got what you could find. H&S has put pay to that these days.

regards
Ant
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T33cno

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Re: MMM Portgarth build
« Reply #83 on: March 27, 2017, 10:11:27 AM »

Thanks Ant
I don't think the motors are readily available I obtained them from a friend.
Any high torque low speed motor will do preferably  3000rpm max.
The T12 motors sold by MMM are ideal but not cheap
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Stumps

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Re: MMM Portgarth build
« Reply #84 on: March 27, 2017, 10:24:07 AM »

Thanks for the reply. I shall continue my search :-))... that's the type of motors that I'm after as the they will need to swing props in the 90-100mm range.
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Fastfaz

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Re: MMM Portgarth build
« Reply #85 on: March 27, 2017, 02:49:57 PM »

  Yo T33,
      Whatever you do don't try and build the superstructure using their template pack! Looking at your very high standard of build you will do a far better job on your own. I have built the following MMM tugs over the years-Norton Cross,Tid,Portgarth,Eldergarth and my own rub on a Norton cross hull (twin screw & Bowthruster) as I remember each of the hulls needed quite a bit of work to get to the standard I wanted involving a lot of time and effort on my part. Re the finish on the Kort nozzles its not good especially for the price you pay and if you think that is bad wait until you look at some of their funnels, the ones that came with my Norton cross kit were absolute rubbish I had to set out and square off the bases to both and reshape the angles so that they matched reasonably well. As to the alleged "ready to use" finish I think they had been roughly trimmed on some form of belt sander with a 40 grit belt. The white metal bits were also crap so I ended up making most of the bits and pieces. I think the problem lies in the moulds being too old and over used without renewal.
     Your build is a very high standard and you should be proud! Good luck with the rest.
           Cheers, Pete.
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T33cno

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Re: MMM Portgarth build
« Reply #86 on: March 27, 2017, 03:09:45 PM »

Thank you Pete
Yes I only intend using the templates as a guide  :-))
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T33cno

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Re: MMM Portgarth build
« Reply #87 on: March 27, 2017, 07:26:25 PM »





Thank heaven today is over what a long day at work :((
Just have my tea then glue the first Kort support.
I'm not going for the blather it in crap option, when I complained of the finish of one of the supports Bryan said you're going to cover 80% of it in body filler  {-)   NOT!
5 min Gorilla epoxy coming up shortly.




The replacement support was even a different colour resin so one cream one white  {-)  FFS
So I sprayed with red plastic primer.
You might notice I've added extra glass and tissue to the stern too, it was pretty thin.
Glue shortly
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T33cno

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Re: MMM Portgarth build
« Reply #88 on: March 27, 2017, 08:07:31 PM »

Simply no need for all that P38 mess

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T33cno

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Re: MMM Portgarth build
« Reply #89 on: March 27, 2017, 08:50:13 PM »

One down  :-)
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Stan

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Re: MMM Portgarth build
« Reply #90 on: March 27, 2017, 09:06:55 PM »

Hi Just two pictures showing the kort nozzle in a very small MM model. Note I have not covered the fitting totally in glue.
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T33cno

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Re: MMM Portgarth build
« Reply #91 on: March 27, 2017, 09:10:53 PM »

 :-))  Good I'm not doing it wrong then  {-)
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ballastanksian

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Re: MMM Portgarth build
« Reply #92 on: March 27, 2017, 09:24:35 PM »

The colour of the resin should not matter as long as it is the same type and quality of resin. naturally, if one was cast in a lighter resin then it may not have the same strength as the other. You were right to refuse the original support as it is just that, and if full bubbles to the point that it is resin foam (by the looks of it) then you are set up to fail. Some polymers are very strong even when foamed (Rohacel and hard polyurethane foams etc) but if it isn't meant to be foamed then it should have been binned or broken up to put into larger castings as pug.

I think what they have been doing is basically sound and they have some innovative ideas, but the quality of product seems to let them down, but that said, they are in business and enough customers are happy bunnies and so if we nudge them they will keep an eye on quality control.
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T33cno

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Re: MMM Portgarth build
« Reply #93 on: March 27, 2017, 09:38:55 PM »

Can't wait to see how it sits on the water with these  {-)
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ballastanksian

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Re: MMM Portgarth build
« Reply #94 on: March 27, 2017, 09:53:48 PM »

They will definitly help but you will probably need a few more besides. She looks very tidy now  :-))
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T33cno

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Re: MMM Portgarth build
« Reply #95 on: March 27, 2017, 09:56:52 PM »


Thanks They will provide an easy continuous 2hrs with my motors but they may be too heavy in the finished vessel. Only testing will reveal  :P


Edit gremlins are messing with font size  :police:
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Fastfaz

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Re: MMM Portgarth build
« Reply #96 on: March 28, 2017, 07:48:33 AM »

Hi again,
     I think you will find that two batteries may not be enough ballast to get the waterline right, I had one battery at the bow end and one nearer the stern this together sheet lead flashing as required did the trick. Its a big hull and superb for towing, you are right about the hull being a bit thin in places I added a couple of extra layers of fibreglass matting to both the bow and stern of my Portgarth as they get bashed about a bit when you are towing. Looking good and very neat work!
      Cheers, Pete.
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T33cno

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Re: MMM Portgarth build
« Reply #97 on: March 28, 2017, 07:57:48 AM »

Thanks again Pete
I'll be happy if that's the case and can use a 7.2 lipo seperate for the bowthruster
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Paul2407

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Re: MMM Portgarth build
« Reply #98 on: March 28, 2017, 12:47:40 PM »

Excellent work there T33cno it's coming along great (shame about the poor quality hull!!) but well done in sorting it out and those Korts and Props look lovely which reminds me I must get around to ordering mine from Protean
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T33cno

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Re: MMM Portgarth build
« Reply #99 on: March 28, 2017, 01:38:18 PM »

Thanks Paul
I'm enjoying the build and that's what matters !
We shall overcome  :-))
I will no doubt buy more
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