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Author Topic: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit  (Read 6758 times)

ballastanksian

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Re: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit
« Reply #25 on: February 06, 2018, 08:48:49 PM »

Groan  %) {-)   

I expect you will have a fair idea having designed several kits now what is needed weight wise, so I doubt you will find any problems. I wasn't aware of differences between the acrylic family but it makes sense.
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carlmt

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Re: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit
« Reply #26 on: February 06, 2018, 09:12:36 PM »

Some acrylics are cast and others are extruded.  Cast is best as the molecules have not been put under tension by being extruded with the risk of the acrylic crazing later (so I was told by my laser supplier). And Perspex is the 'go to' brand for quality acrylic because the formulaic make up of the acrylic is constant.  A little more expensive but you are paying for quality.
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ballastanksian

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Re: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit
« Reply #27 on: February 06, 2018, 09:15:03 PM »

That is useful to know.
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raflaunches

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Re: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit
« Reply #28 on: February 06, 2018, 09:17:45 PM »

Excellent quality stuff- I use Perspex for turret barbette rings and funnels after reading that Brian King used it for the same reason.
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Klunk

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Re: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit
« Reply #29 on: February 06, 2018, 11:34:45 PM »

Flo is getting slow on the planking Carl. Does she need some more bubble wrap???
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Brian60

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Re: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit
« Reply #30 on: February 07, 2018, 06:54:43 PM »

As Carl says, there are several variants on acrylic sheet. Extruded or cast can be cut on a laser but by far the best result is from cast. trouble is the stuff is  not cheap compared to extruded.

I've found it can be bonded ok after cutting on a laser (extruded) but does craze like mad sometimes -  I think this is down to individual batches rather than 'across the board' so to speak.

ballastanksian

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Re: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit
« Reply #31 on: February 07, 2018, 09:57:19 PM »

To paraphrase the saying: 'You normally get what you pay for'.
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carlmt

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Re: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit
« Reply #32 on: February 12, 2018, 11:34:47 PM »

Another chilly evening in the workshop - roll on summer PLEASE?????
Have now finished the planking to the hull below the belting line - just awaiting the delivery of a load of jelutong wood.  The gaps you see in the keel near the stern will be filled with jelutong and then carved and sanded to shape.  The same with the bow and stern.
 

 

 

 
The hull sides above the belting will be created using sheet as opposed to planks as, other than a slight horizontal crease midway along the sides, they are flat.  The bow and stern where the doors are will be created using the jelutong again carved and sanded to shape.
 
Once all this is done, the whole plug will need to be sanded smooth, skim coats of filler applied and sanded again.  This will be repeated until we have a very smooth and fair hull and then the whole lot will have three or four coats of filler primer applied and then rubbed down, wet, until we have a glass-smooth finish.
 
 :-))

derekwarner_decoy

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Re: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit
« Reply #33 on: February 13, 2018, 12:08:15 AM »

Carl......the hull bellying is unique %) ...does it have a design reference?.............. Derek
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carlmt

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Re: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit
« Reply #34 on: February 13, 2018, 12:37:35 AM »

To be honest Derek I have no idea!  I created the frames from the lines plan and this is how it has turned out.
It looks pretty drastic in the photos but in reality it is very shallow - I think the line of the planks emphasises it.  Where the hull skin rises again is where the A frames for the props sit - perhaps it helps direct the water flow into the prop? Just guessing there....

hama

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Re: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit
« Reply #35 on: February 13, 2018, 04:45:10 AM »

Looking good Carl!
Best wishes to you and Flo  :-))
Hama
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carlmt

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Re: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit
« Reply #36 on: February 15, 2018, 11:03:31 PM »

Looking good Carl!
Best wishes to you and Flo  :-))
Hama
Cheers Hakan !! By the way, we have a nice package here for you - we will send it over soon.  Hope you enjoy!!!  :-))
 
Been back in the workshop this evening (what's new there I hear you cry!!!).  Blocking in with Jelutong where some shaping and carving is to be done.
 
Firstly the bow below the belting:
 

 
And then the stern......which, once dried, I couldn't resist carving and sanding to shape.  It is SO satisfying to see it emerge!
 

 

 

 
We had a delivery of 3D parts from Shapeways today as well - which included the stern rudder and skeg, bow rudder and frame and the bow and stern loading platforms.
 
Here is a shot of the bow rudder and it's frame placed in position.  Marks will be made in the hull to locate the rudder shaft as well as the location for the propshaft - as you can see, the shroud for the propshaft will sit half into the hull so a slot will need to be cut to accommodate this.  The shroud will take a 6mm o/d tube which will contain an M4 stainless steel propshaft :
 

 
 :-)) :-))
 
 

Kim

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Re: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit
« Reply #37 on: February 17, 2018, 12:38:39 AM »

Hi All,
Cast / extruded argument eventually showed up in Laser cutting discussions..


CNC cut Extruded will be the cheapest option to get the parts to fit (Remember, cast is nominal thickness so no matter how good your calculations are the material will stuff you .....how do i know ? ..... i sold 5 stands before making the discovery! ...many moons have past ...


For tolerance work now I either cnc extruded for cheapness or use Hesaglas on the Laser.
Cheaper in the long run on tolerance work.
Hope it helps/ saves costly mistakes.

Regards,
Kim
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Kim

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Re: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit
« Reply #38 on: February 17, 2018, 12:50:00 AM »

But i have to say at the risk of being cheeky ...
Carl, you need to get some filler on that dip... I often wonder if it was a Pre-Digital thing to stuff one former on a drawing. It throws the faithful copier right off ... lol


I laugh with you as i have just encountered almost the same problem recently.

Regards,
Kim
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derekwarner_decoy

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Re: Linkspan Models : MV Spirit of Free Enterprise - Development of a kit
« Reply #39 on: February 17, 2018, 01:21:32 AM »

So Kim suggests.....'you need to get some filler on that dip'

Maybe just over 1/2 a litre volume per side?.......... :P ....Polyfilla + Microballoons ?

Derek
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