Author Topic: Centurion Tank  (Read 9227 times)

Dave Winfield

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Re: Centurion Tank
« Reply #11 on: February 14, 2013, 04:38:20 PM »
Its big...but its not that big.

You know what I mean?
Its fun big. 
But it should still fit on most shelves.

And, with a little effort, its easy enough to print it at a reduced scale.
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Vermin King

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Re: Centurion Tank
« Reply #12 on: February 14, 2013, 05:10:14 PM »
I noticed on PM that someone is hoping to convert this to an RC tank.  That would be exceptionally cool.
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Dave Winfield

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Re: Centurion Tank
« Reply #13 on: March 30, 2013, 11:12:00 AM »
End of March Centurion Update

Well, its been a while (with this project), but just to prove it has not fallen by the wayside...

I ran up against a few issues with my first Hull form.
The central Hull being the the main part from which everything is attached, turned out to be
a bigger obstacle than I had envisioned Buried under a lot of tank "bits" it is deceptively
complicated and has a very particular shape with many compound angles which proved to
be a challenge to design as a paper model.

While it would have been possible to cheat with a smaller scale model and make the Hull more
boxed shape, at this scale I have to be faithful to the actual shapes and angles involved.
For example, the main chassis/hull has angled sides making the belly plate only about 70% as
wide as the top plates. (This is of course to deflect incoming fire down toward the ground)

The nose and Tail have multiple angles as well...setting up some interesting compund angles with
the side plates.

None of this is too difficult, until you try to design an inner form using thicker card, in as few pieces as
possible, that can be easily understood ny the builder...
and an outer "skin" that matches the contours and angles PLUS fits over the formers with just the right
amount of tolerance.
And of course, there has to be a workable assembly method for all this.

Complicate all this with my flip-flopping on the final scale size.

Anyway, the point is...I went through a number of Hull designs...printed parts...and wasted cardstock...
before finally arriving at what looks like a workable Hull!

This design has the fewest parts so far,  and I took the suggestion of using a tab-slot assembly method
for the Former parts. (sorry, I forget who actually made the suggestion, but thanks)
The "tabs" are small...even at this scale...but not difficult to deal with.
However, the final assembly requires a little sanding of the tabs as they stick through the side plates.



So, with a new Hull former design, I was able to modify all the "skin" parts to fit and add the remaining
design elements (tabs, slots, cuts, folds, etc).
And I ran through a quick test of all the "skin parts, making sure everything fits the Hull.
(and figuring out all the adjustments and necessary fixes)

And...everything went together properly so I finished up the textures and colouring on the actual parts

Next step is to build what hopefully will be a final Hull assembly.
(I've already started work on Suspension parts, so it better be!)

But, before I do that, I need to sort out the Driver's compartment and Engine compartments.
These will be tubs that are inserted into the Former assembly.
They can be assembled separately and don't rely on any other assembly.
But, they will need to be fitted into the Hull former before the outer skins go on.

I have the Driver's "insert" almost done...just got to add the foot pedals and hand controls,
and a few more small detail elements.

But it will be an awkward squeeze to get in in, since I already sealed up the top of the
Former assembly! (yes it really needs to drop in from the top!)

The Driver's compartment might seem a little pointless (and it is completely optional for the
builder) since the only viewing of this area will be from a very small access port above the cockpit.
But its there in case you want to install it.


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milenio3

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Re: Centurion Tank
« Reply #14 on: April 04, 2013, 03:15:04 PM »
Clean and nice!
- Gerardo
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Dave Winfield

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Re: Centurion Tank
« Reply #15 on: April 05, 2013, 09:26:07 AM »
Centurion update...

still haven't attached the Hull skins!
The cockpit tub is in place...and now I want to finish the Engine and Transmission compartments.
Some of this can be installed after the hull skins are attached, but the original plan was a "tub"
insert (kind of like the Cockpit insert) and that required fitting before the skins went on.
I have made a few design changes and now there will be one "tub" insert for the Engine(s) area*
and some side wall parts for the Transmission area.

*yes, the Tank has two motors (three if you count the electrics that drive the Turret).
Main drive is a 12 cylinder Diesel engine. Electrical generator is powered by a four cylinder engine.
Both of these engines fit in the main Engine compartment.

Anyway, my main troubles sorting out the rear compartment parts are caused by the central longitudinal former.
I was going to link up Engine, Transmission and Differential with driveshaft, clutch and couplings
but the center longitudinal former is in the way of where the driveshaft and its parts would be.
And the cross formers would also require unplanned holes and openings for parts to pass through.

I finally decided to drop the complete drivetrain linkage and focus on the main components only.
A lot of items are not visible behind other items anyway,
and some areas are just not that visible because of framework and such. 

So, I will focus on the main, larger components including the Transmission/Differential which will
be fitted below movable Radiators.

Anyway, I have most of the parts done...hopefully this weekend I can get things printed and installed
and I can get back to attaching the outer Skins.



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Dave Winfield

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Re: Centurion Tank
« Reply #16 on: April 10, 2013, 11:15:16 AM »
April 9 Centurion update...Hull skins are attached!!

Heres what I finally got down over the last week...
in anticipation of attaching the skins to the Hull former, I need to sort out some of the
"interior" parts, just in case any overwrap of the skins interfered with installation.
I also didn't want to risk damage to the skins, so I think this will be the recommended
assembly method...to install most, if not all of the interior parts before attaching the Hull skin.

A few shots of various stages of the progress.
You may notice some part changes...
I didn't photograph everything, but some parts got many redesigns before arriving at the final designs.

First couple of shots show the installation of the Engine compartment "tub" and the early versions
of the Fuel Tanks and Air Cleaner housings.
I decided to drop the rear (Transmission) compartment tub and simplify the Differential and Transmission
assembly...but first I needed to get the cooling fans in place.







As I mentioned, the Transmission/Differential has been somewhat simplified for assembly and
installation...partly because I like to appeal to less experienced builders,
and partly because its a well hidden part.
I also had a problem related to my Former design...the center longitudinal rib is in the way of
a full drive train (drive shaft, clutch, couplings, etc).

I made the decision to stick with the bulky major components in the Transmission and Engine bays
and leave any more detailing up to the builder.

So, next is the installation of the radiators and cooling system.
This involves swiveling Radiators that reveal the transmission and cooling fan areas.
My original design had some fairly complicated plumbing which caused me a lot of troubles during
assembly, so I opted for an artistically modified Coolant reservoir which simplifies the plumbing and
swivel mechanism for the Radiators.

(Keep in mind, there is still a framework to go over top of everything that will support all the Engine
Bay covers and upper deck components.)









and, as you can see, I have attached the Hull 'skins".
Other than some edge colouring, before and after the installation,
and a little trimming...
all went together quite nicely.
I haven't sealed up the top deck yet...I want to install the front hatch parts first.









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Dave Winfield

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Re: Centurion Tank
« Reply #17 on: April 10, 2013, 11:43:20 AM »
almost forgot...

I also got the front Glacis plate installed to complete the Hull form.
(A little rushed - I definitely could have done a better installation. I was trying to get a photo
real quick and I rushed the assembly. But a lot of it is hidden by the side skirts anyway...)



And now I am working on the Engine...
the front hatch will have to wait now, until I get the engine and its components done.

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Dave Winfield

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Re: Centurion Tank
« Reply #18 on: April 14, 2013, 04:19:18 PM »
Centurion April 14 update...

So...I've got a few small tweaks and changes to make...
some minor adjustments...

but I think I've got the Engine components all done!

Engine bay is filled with Motor, Generator, Pulleys,
Fuel Tanks,  Air Cleaners, Oil Tank,
Cooling Fan intakes and Intercooler.
Only thing I left out was the turbochargers since room is tight
and they are completely hidden anyway.
(Same reason I didn't bother with the hidden Exhaust pipes)

Rear compartment contains the Differential/Transmission, Brake Discs,
swivelling Radiators, Cooling Fans and cooling deflectors.
(as I showed in earlier photos)







Also got the Driver's compartment hatches finished.
Once again, got a couple of adjustments to make to allow them to open and close easier.
Obviously you can install them closed, open or somewhere in between...but if you want
them to be hinged, they can be.
My Hinge design is very simple and relies on paper folding - but the builder could modify
it to be a real hinge. I've seen some pretty creative hinge builds!

The Viewing Periscopes are represented and they do swivel within the Hatches.
(They are one of things I have to tweak...mine (shown) are a little oversize, and they
interfere with the Hatches opening and closing.)








...
Now, its on to the Engine compartment Covers.
I have to design the supporting framework which will complete the two rear bays.
And design the hinged Engine covers that will seal up the rear of the Hull.

Centurions!....march!!
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milenio3

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Re: Centurion Tank
« Reply #19 on: April 15, 2013, 04:38:21 PM »
All of these details remind me that I need more tools for my hobby. I think of rivetting the whole model... but I wouldn't go that far.

I guess you leave to the modeller choice to do the weathering or not.
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Dave Winfield

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Re: Centurion Tank
« Reply #20 on: April 15, 2013, 05:32:28 PM »
rivets? on a Centurion?

only AFVs with rivets would be WW1 era.
After that, everything is welded.

The front Glacis plates (Hull nose area) are 102mm thick!
Are Rivets even possible!?

You might find some rivets on the thinner panels that make up things like the Side Skirts.

....

as far as weathering...the British and Canadian Centurions are painted in a slightly glossy dark green enamel.
They always looked freshly painted.
The only weathering appears to be the on the display tanks...from years of sitting out in the elements not being used.

You might consider some mud and dirt if you were building earlier versions of the Centurion as used in Korea.
But the Mk. 5 was stationed mostly in Germany and didn't see any real combat as far as I know.

I have added a surface texture to the tank's panels, more to simulate the rough blotchy surface of painted steel.
But this dark green colour makes it very hard to see.

I'll definitely add a little bit of shading and water staining to the side Skirts and Turret.

I think if I do a sand Israeli version, it will have some all over panel shading.
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Dave Winfield

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Re: Centurion Tank
« Reply #21 on: April 16, 2013, 07:09:20 PM »
No new building...or designing, for that matter...

decided to take a break and work on Instruction Pages.
I have learned from past projects that the Instructions can
end up being a lot of time consuming work! And...its not
easy to remember how it all went together when you get to
the end!

So, why not catch up and get ahead of the progress by doing
the Instruction Pages to cover what I have done so far?

And thats what I am doing.

Stay tuned...

DAVE WINFIELD - GO TO WWW.CUTANDFOLD.INFO FOR MY DESIGNS AND LOTSA FREE STUFF!