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Post Info TOPIC: Building the Master Box Mk1 Tank


General

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RE: Building the Master Box Mk1 Tank
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Helen,
it might be my specs but the MB barrels seem to have a curved profile so rather than a straight taper, they seem to have the tiniest of curves which would create the undersized muzzle. I am content with my surgery.

All,

I was looking through the various photos etc I have of the Mk1 tank, trying to convince myself that the roof, rear, inner rear horns and tail steering unit should be grey and not camouflaged which is the popular choice. I am rather of the view that 'just because we can see the top surface of our model tanks' that doesn't necessarily translate to the real thing. Observation from the air, when laagered, was taken care of with tarpaulins - when moving the exhaust smoke and tracks would give them away. I really can't see the crew jumping up and down of the example tank and theirs to complete the camouflage of the body to the rear of the driving compartment. I will finish my first tank in camouflage with grey top/rear for comment.

Helen

During my 'research' I found a photo of the drawing of the steering tail arrangement at the front end and my thoughts/observations that the forward 'triangular' bracing plates were within the profile of the rear horns is confirmed.

I must reduce this drawing to scale and see how it compares with my version/Helens efforts.  I will also present a suggestion on an easy modification to correct some of the MB steering tail errors - it won't be perfect but it will be better.



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Hero

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Hi,

Yep seen it and used it. :) Thanks for pointing it out though, as I had forgotten about it and should have pointed people to it before now.

Anyhow, I have a link for you. :)

The WW1 Modeller site has put up a walk around of Bovi's Mk1 Tank. Only a few photos, but they're nice and big and before they hid it away in the diorama. 

Helen x

WW1 Modeller



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General

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Helen,
I have superimposed that diagram over your fine drawing. I've used the positions of the rear of the horns to reference. The angles are the same (if you fiddle with the juxtaposition of the drawings they tie in nicely). However, the superimposed drawing rather suggests that the tail steering unit is slightly longer than your drawing. I'll go and do some work on it momentarily.

See attachment.



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General

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Although the attached drawing looks the same as the previous post, it is in fact an amalgam of 2 copies of Helens drawing plus the engineering drawing. In 1:72 scale it puts the axle almost exactly 2mm further away from the rear of the tank than Helens original drawing suggests.



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General

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So you can make your own minds up here is a composite with the MB offerings included.  Things to note - forward end of tail unit is about 1mm too narrow, the place where the X beam joins the axle is too close (as previously discussed).  However, it makes my proposed modification a little easier as 'we' have to find 2mm extra length, most of which will be in the correct spacing of X beam and axle.



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Legend

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TeeELL, I'd need to have a look to see where it was, but I did see a pic of a Mk I showing part of the roof recently - and although the lighting of that part was not as good as on the sides, I believe it did show a camouflage pattern on the rearmost roof panel. Whether the flat part of the roof was camo'd or not is guesswork, but some of the Mk Is must have been more thoroughly painted.

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TCT thanks, I would be most interest. I have a photo showing, very clearly, the camouflage on the side of the tank but the roof appears a single colour.

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General

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I had to go to the desktop to find the photo mentioned in my previous.

Here it is - camo very clear on the sides - not so on the roof and rear, apart from the storage box.



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Field Marshal

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Here's a photo of 534 and 546 bogged down in Delville Wood on 15/9/16.



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Although I've posted these photos on the 'Grenade canopy' thread, I thought I'd duplicate so as to complete this thread (as far as the Grenade Canopy is concerned). The diagonal braces have not yet been added as, like the main frame, they sit on top of the netting.  Overall, I am very happy with it and the angle looks to be spot on - thank heavens for O-level technical drawing (A grade pass as well!! - smarty pants!!! - only did it to get out of doing French).

 

I am just finishing off the tail steering assembly - drilling out the bolt holes for the attachments on the axle.  Should have that done and attached to a tank this evening.  Believe it of not my lathe milling attachment has got too hot.

 

Oh, as an aside - I am going to make a run of rear axles so if anyone would like one ........ 



-- Edited by TeeELL on Thursday 6th of February 2014 05:44:13 PM

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General

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The steering tail is complete and I have started on the second version. Rather than follow the 90% scratch build formula I am following my suggested build as per the 'Improving the MB tanks steering tail'. Hopefully I can create almost as convincing a unit. I have made the rear axle, just need the reinforcements and ends and I am planning on knocking out some 'spares' if anyone is interested. So here, then, is the tail unit of the 'female' tank.



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Hero

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Hi,

The tail wheel assembly is looking a whole lot better, it now looks like something that will steer. Nice work!

The only thing I can't make out clearly is the position of that 'L' beam I had the wrong way round originally on my 3D drawing. It should sit on top of the corner reinforcing plates, which is why the lightening holes go so close to the beam, as the plate run under it. 

 

Anyhow, I finally worked out what it is that has been annoying me about the model. You know how it is, you look, you look again, and the thing that is annoying just won't show itself... but you know there is something. confuse

The reinforcement 'L' beam that runs around the outside edge... isn't!

It can be corrected easy enough with a thin strip of plastic glued around the outside edge, overlapping slightly to give it the correct 'L' shape. But it's annoying me now I know it is missing from the kit. no

Still, if it was a perfect kit I expect people would moan about that also! Modellers need a challenge to be happy. :)

Helen x

 



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General

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Hi Helen,
Initially I was inclined to disagree with your assessment of the position of the L angle iron cross beam. However, further study of available photos indicates that you are correct that the angle iron is riveted on top of the triangular bracing plates. However, I contend that the large lightening hole of those bracing plates is 'just' clear of the angle iron and would appear circular if viewed from above. We will not be able to confirm one way or the other until Tank Museum allows you to crawl all over it - something that seems unlikely for the foreseeable future. Perhaps a photo will turn up from pre 'diorama' days or even from when the tail was attached to the Mk2.



-- Edited by TeeELL on Friday 7th of February 2014 12:18:37 PM

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General

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The thin bit running around the track guides, is what 1/2" thick max? So .15 mm or .5 thou approx. well, my thinnest sheet of plastic card is .22 mm and it would be a nightmare even fitting that. I think there comes a time where the scale will defeat us!
Having spouted that load of old tosh, I have just had a look at the Airfix model - blow me if that doesn't have that very lip around the tank (excepting the roof from the start of the panel ahead of the sponson to about 2/3 along the second panel behind the sponson). So it could be done 50 years ago!!!

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General

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Just to prove the point Helen made about the lip that runs around the track guide and to show Airfix could do it 50 years ago:



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Hero

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TeeELL wrote:

Hi Helen,
Initially I was inclined to disagree with your assessment of the position of the L angle iron cross beam. However, further study of available photos indicates that you are correct that the angle iron is riveted on top of the triangular bracing plates. However, I contend that the large lightening hole of those bracing plates is 'just' clear of the angle iron and would appear circular if viewed from above. We will not be able to confirm one way or the other until Tank Museum allows you to crawl all over it - something that seems unlikely for the foreseeable future. Perhaps a photo will turn up from pre 'diorama' days or even from when the tail was attached to the Mk2.



-- Edited by TeeELL on Friday 7th of February 2014 12:18:37 PM


 Grrrr... that shiver going up your spine is me giving you the evil stare!  I didn't say touching, I said close! 

Right, now I've told you off I have more info/work for you. :)

It's been a day of sudden realisations (If little housework), I now know why I had the L beam facing the wrong way. It would seem at some point when doing the 3D drawing... I ummm.... flipped the drawing upside down. no

The L beam faces different directions top to bottom. Oh and they're bolted on, not riveted.

I've dug out some underside photos for you to help in your build.

Helen x

Oh and how about some wheel hubs? :)

 



-- Edited by MK1 Nut on Friday 7th of February 2014 02:24:39 PM

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General

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Sorry, sorry, sorry!!   But we are getting facts together are we not?  We won't need access to the real thing at this rate.  Those are exactly the sorts of photos that help with gaining the knowledge.  So question is, do we have any idea what the longitudinal bar with the loop under the rear axle does, in addition is there an awareness of how the steering mechanism operated - perhaps not appropriate for 1:72 but the 1:35 plus scale merchants might wish to know ( if and when such a model appears).

Wheel hubs err yes, they are missing because I haven't yet finished tidying up the wheels. The MB plastic is a bit strange and cleaning it up is a little challenging.

 

Helen, you will delighted to know that there will be no more posts from me from Tuesday for at least 2 weeks.  Off to Cuba!



-- Edited by TeeELL on Friday 7th of February 2014 04:51:16 PM

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Legend

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TeeELL, you say 0.15mm thick plastic card needed for scale? You could try the website for Cornwall Model Boats, I made a note recently of the thicknesses they sell, and according to what I wrote down they have 0.13mm sheet; if you think thin metal would hold a curve more easily, they have brass sheet from a company called KS Metals, also 0.13mm thick.

Alternatively, given the size of the components to make, and the need to trim/file the edge of the hull plate to accept the thickness of the new rim, perhaps it's preferable to keep your sanity...wink



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Legend

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TeeELL wrote:

So question is, do we have any idea what the longitudinal bar with the loop under the rear axle does, in addition is there an awareness of how the steering mechanism operated - perhaps not appropriate for 1:72 but the 1:35 plus scale merchants might wish to know ( if and when such a model appears).


 I think the answer to your two questions is one and the same. I've wondered on occasion how the steering worked, and it seems quite possible that the long bar with the loop at the end is a tiller, in the same style as a boat tiller: move the front end of the bar to the left and it will pivot on the chunky pin running through the loop at the other end, with the steering track arms being pushed to the left, which would turn the wheels to steer to the right (and vice versa).

At first it seems a bit crude, but when you think about it, the length of the bar is about 3-4 times the length from the pivot (at the loop) to the steering track arms, and this will provide an essential mechanical advantage (leverage) to lessen the force required for steering.

At the driver's end, steering was effected by a steering wheel, which moved a cable in similar manner to a ship's wheel (before the modern days of hydraulic telemotors), so somehow I suggest that there should be some pulleys (I think one is visible in photos of the Bovi Mk 1) to guide the twin cables that emerge from the rear bulkhead, so that one cable can pull the tiller to the right, and one to the left.

Make sense?



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General

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Now that makes a huge amount of of sense TCT. Perhaps the little circular thingies at the front are pullies? Incredible that a Mk1 tank was 'steer by wire' (but then you need to think laterally to my past with 'fly by wire' to appreciate the irony).

Time to go and pack my swimmies and water wings I think.

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Hero

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Yep TC has it right. 

The six bolts on the front slope below the cab, hold the steering wheel. From the wheel runs two cables that go back throughout the tank, exiting through tubes in the rear bulkhead.

The tubes run down either side of the inside of the rear horns. The tubes turn 90% to point the cables at the two pulley wheels attached to the long tiller arm. The cables go around the pulleys and tie off to the frame.

The long tiller arm is attached by a bolt through the axle beam, which is the pivot point. Off the tiller pivot two short arms to the wheel hubs which turn the wheels.

Phew!

I think I will do a drawing, it's got to be easier. :)

 



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Hero

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Great work on the roof and the steering mechanism, TeeELL! I'm much behind on my projects... and going off on vacations next week won't improve my productivity at the model desk...

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Field Marshal

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TeeELL wrote:

Just to prove the point Helen made about the lip that runs around the track guide and to show Airfix could do it 50 years ago:


 Even the much maligned Emhar 1/72 Mk.IV had the lip running around the track frame, a strip of 10 thou evergreen should do the trick.



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Has anyone else noticed "new and improved" seems to mean it doesn't work as well as it used to?

 



General

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Aaaaargh! No, no, no it am going to live with the lack of lip. The enhances tail wheels and extended grenade roof will divert attention.

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General

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Strewth, I am a Major. The equivalent rank I held in the RAF. Cool!



-- Edited by TeeELL on Friday 7th of February 2014 10:36:35 PM

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Hero

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Having finally taken the plunge I am now working on my first 1/72 scale model in about 40 years. On the first page of this thread is this photo posted by Rhomboid, can anyone tell me when the deflector plates were attached beneath the two front hatches. They do not appear on the first tanks ? Just wondered about timescale !

Paul

 

 

 

 

Unknown MkI female November.jpg

 

 



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Hero

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As far as I know it was a one off adaptation for a known bullet splash problem. From MKIIs onwards all front flaps had protective rims around them. It would be nice to know if it was crew inspired or an designers stopgap measure.

Helen x

 



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Hero

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I just found it interesting that it was within the period of grenade screens as well. No way of finding out which tank this is ?
Paul

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Hero

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The picture is of HMLS " Oh I SAY ! ".  Comparison footage found at  http://www.youtube.com/watch?v=M7K485WdBTo

It is the Female at the start of the film and shows many identical features and paint scheme. Thanks to Philthydirtyanimal for the footage.

Paul



-- Edited by Paul Bonnett on Monday 3rd of March 2014 01:44:00 AM

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General

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Here I go: would it be correct to suggest that the film footage predates the photo of 'Oh, I Say' ? In the film footage the area beneath the vision panels appears the same 'colour' as the immediate surrounds; in the still, the 2 anti splash panels are of a decidedly darker hue.
In addition, further observation of the extended anti grenade screen, when the crew are clambering over it, rather suggests that support is achieved only by connection to the main screen at the front and a centre point at the rear. On my model the centre V brace of the rear extension rather neatly aligns with a hull top cross member ( by accident rather than design) and gave me cause to think that that might be the place for side supports. Notice also, the piece of sacking at the trailing edge covering the left hand track.
Finally, in the front view still, the area above the driving vision panels is rather indistinct, can anyone hazard a guess as to what the cause might be? Chicken wire excess perhaps?

PS. Cuba was great although the rainfall for the first few days was unbelievable!!!



-- Edited by TeeELL on Monday 3rd of March 2014 11:45:24 AM

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Hero

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The photo was described as "Unknown MkI Female ", and in the film footage you can see "Oh I Say" quite clearly on the front side. The shape, size, position of the camouflage are, I believe, identical although in the still its somewhat dirtier !. The materiel along the top, front edge, of the drivers cab seems identical to although I cannot decide what this may be ? The light hitting the front of the tank maybe somewhat different but there is a protrusion around the two hatches showing up in the clip that is in the same place as those in the still. Just some of my observations
Paul
ps Hope you had a great hol ! TeeELL

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General

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It is quite fascinating deciphering information from these photo's and film clips. My slight frustration at present is that I would like to capture a still from the youtube clip in order to study the camouflage pattern, but have yet to work out how!!

Now, I've heard mention of a rear periscope and by chance noticed what might be the very same on a photo I put on here earlier in the thread, so my question is:  is it the item circled?



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Hero

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Going by the comparison to the front 'scopes and its apparent position I would agree that it looks like the rear periscope.
Paul

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General

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Well,
I have actually been doing some work on the 'Female' tank in the hope that I might break out the airbrush and apply the undercoat!! My plan is to create A17 HMLS 'Oh, I SAY !!!' and I've managed to achieve what I though impossible, and acquired some quite reasonable stills from the youtube clip. In addition I have determined that A17 had the hydraulic system shield fitted - so if you know otherwise don't tell me.
Thus today I have drilled out holes for the 2 headlamps, fitted the MB hydraulic system shield - which is not covered in the instructions - and completed the assembly of the second side. I've done a little modification to the extended grenade canopy as photographs show that the 'spine' to the extension is quite substantial and mine was not.

The shield is symmetrical and, to my eyes, the photo of a shield on a damaged tank suggests otherwise. It appears to me that the side of the shield adjacent to the door has less of an angle than that side which is attached right next to the ventilation louvre. I have thus offset the shield slightly, to the left. It further appears that the mounting support for the upper cross member of the tail springs is also offset with regard to the shield but central in respect of that cross member. I have replicated this feature.

The photos show the shield mounted, the need to remove a portion of the shield to allow the offset (it otherwise fouls the springs), the 'real thing' and my model version of the additional supporting point.



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Legend

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The impression I have of the shield is that it is asymmetric: the right side is closer to a right-angle bend than the left, which is wider than 90 degrees; this is because the rear door is too wide to allow a symmetrical shield.

PS - hope you enjoyed your holiday!

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Hero

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Hiya, Glad to see you survived your holiday. :)

The sheild is 'another' part for me to get around to. no Just finished the 3D drawing of thew wheels though. :)

As you've both deduced the shield is not symmetrical as the rear door gets in the way. It is also quite short, as shown in some of the photos taken of the tanks sent to Palestine. They didn't use the wheel mechanism but they did have the same shield.

Helen x

 

 



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General

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Helen,
Take a close look at your photo in the previous post and compare it with the one you posted a while back (and is included in my post immediately prior to yours). In the 'Western front' (WF) photo the shield seems to me, to be attached on the left side very close to the louvre but the 'Sir Archibald' version is closer to the line of vertical rivets. What do you think?  Further more, the position where the additional tail top support bracket might have been on 'Sir Archibald' is in a different position - it appears to be closer to the right hand edge, if indeed, it is where the bracket might have been.  I really must get out more!!!  The more the photos are studied the greater the conundrums revealed.

Further study, albeit only slightly more than cursory, is causing me to conclude that the shield on 'Sir Archibald' is not the same design of shield at all!!!  The aforementioned support bracket on the rear of the WF shield is positioned approx in line with the 3rd and 5th rivets down but the possible 'witness' position of that bracket on Sir A is in a different, higher, position.

From the modelling perspective the MB shield really needs more work doing to it than I carried out, but hind sight is a wonderful thing.  I didn't get round to spraying the undercoat this evening as 'Death in Paradise' beckoned, so that will be tomorrow's task.

i wonder if it would be the act of a mad man to make a model of a Mk1 with the studs for the 'spaced armour', would it be possible to find enough information to be able to place representations of the studs in the correct positions over the whole tank?



-- Edited by TeeELL on Wednesday 5th of March 2014 05:16:26 AM



-- Edited by TeeELL on Wednesday 5th of March 2014 05:20:53 AM



-- Edited by TeeELL on Wednesday 5th of March 2014 05:24:48 AM



-- Edited by TeeELL on Wednesday 5th of March 2014 05:31:33 AM

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General

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Helen mentioned the shield being quite short, I wondered if that might have been why I had to do some trimming and filing to fit the MB shield. The answer is no, the MB offering appears to be about right so it is just the geometry of the side panels that needs slight re working.
Thought I had better post anew as I've already edited my previous post some 5 times.

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General

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I have done some work on the Grenade canopy (see separate thread) and the steering tail of my 'Male' tank (again see separate thread). All of that was simply putting off the moment when I dug out the spray booth and fired up the Paasche airbrush, finally I couldn't think of any more excuses so I dug out a pot of 'Sea grey medium' and primed the beast. I figure that grey might well have been one of the camouflage colours so I will mark out the pattern of 'OH, I SAY !!!' and probably brush finish the remaining colours with acrylics. I am going to cheat a little with the pattern to ensure I have a single colour where the HMLS 'NAME' and A17 go to make creating and printing the decals easier.

So, this MB 'Female' Mk1 tank is, to all intents, complete. It is a sound kit but requires attention to the order of construction to sort out the distortions in the 2 major body mouldings. This thread has covered areas where the kit is slightly faulty (and ironically, where the Airfix offering has achieved the right results) and has opened up a few interesting lines of investigation. Neither this nor the Airfix kit has correctly modelled the tail unit both companies making similar errors but with a little perseverance the short comings can be overcome - heck, model a tank without the steering tail!!

I will add to this thread anything from making the 'Male' tank that is relevant.

I would like to thank each and everyone of you who has contributed knowledge, photos and discussion to help this thread along and I further hope that, in conjunction with the reference kit review, the information presented will encourage you modellers to get creative with these MB offerings. Whilst I remember - don't forget to tell your local model shop about these models, mine was most certainly unaware. The more kits MB shift the more likely we are to see more variations from them.



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Legend

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Having looked at the two photos, TeeELL, I don't think there is any appreciable difference; perspective will cause the sticky-out radiator louvres to mask part of the gap in the Western Front photo, such that the shield appears closer to the louvre than it is.

As for the rivet/bolt positions for the steering tail cross-bar, by my count the two rivets above and below the name "Sir Archibald" are at exactly the same heights as those on the other tank.

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