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Post Info TOPIC: Details of rear door lock on Mark IV
MRG


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Details of rear door lock on Mark IV
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Hello everyone!

As I have received excellent help here before, does anyone have a closer picture of the door lock mechanism on the rear door of the Mark IV?

My search on the internet has not been very successful so far.

It would be of great help, as here is a picture of what I am up to at the moment..

 rear

Any help would be much appreciated.

Once I have more done, I will post a full report on the project.

With kind regards,

 

Martin



-- Edited by MRG on Tuesday 13th of March 2012 07:12:47 PM

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Legend

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Hi Martin.

I've just looked at the pics available in landships articles; you've perhaps done this already. The MkIV interiors page has a couple of reasonably close pics of the rear bulkhead of what I think is Flirt II, but they look like it is missing the mechanism - it seems to be missing all the interior fittings.

More helpful might be the video of sponson removal from Grit in the Australian War Memorial; this vid is found on the 'surviving MkIV' page, and eventually, around 4min 23sec, pans across the interior to show the rear bulkhead more closely than the photos do.

Unfortunately that corner of the tank was not well lit when the vid was made, but if you watch fullscreen you should see a fair bit of detail, especially if taken in conjunction with the photos. There seems to be a bar/lever across the door towards the top, which is not present in the photos inside Flirt II.
Hope this is of use,

TCT

 

PS - what you've done so far looks great. What scale are you working in?



-- Edited by TinCanTadpole on Tuesday 13th of March 2012 03:24:49 AM

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Colonel

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Bovington tank museum have original full scale drawing of this door section EOC drawing 22038 (20335) contact the museum library, i think the drawings cost £10 each but are worth it. I do detect two wires in the model, is this going to be a working scale model ie RC.



-- Edited by BC312 on Tuesday 13th of March 2012 09:51:39 AM

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Colonel

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Not sure if you have seen this one.



-- Edited by BC312 on Tuesday 13th of March 2012 09:57:40 AM

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MRG


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Thank you very much for your replies!

Thank you TCT, I had a close study of all the available photographs on Landships, with Flirt's pictures offering some hint. The problem is, I want to make the locking mechanism working like in the original tank and the images are just not clear enough. But I will have a closer look at Grit's video again, thank you for telling me!#

Thank you BC312, does Bovington send such drawings by mail?

As I live in Germany, it's not that easy to get to Bovington but I plan to do so for the tank fest. Holidays are planned already, Yehaah! But I want to get the door done before.

Yes, it is going to be RC, scale is 1/16. The tracks are going to be the greatest challenge, but I am negotiating with some tool makers to make me a punch and die (not the painful sort, I mean) for the track plates.

Here are some more impressions of my efforts so far.

door detail

roof

rear2

 

front

With kind regards,

 

Martin



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Colonel

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Martin if you e-mail bovington library they will send you a picture of the plans but in low resolution so you can just about see what the drawing involves, they also do other detailed drawings ie the actual drawings/blueprints of other parts like the bogie wheels tracks etc etc. If you quote the drawing number of the door i have given you they will send you details i got my hull drawings from them and i paid paypal, they could either send these by download or on a CD. If i had the money i would buy the lot.

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MRG


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Hello BC312,

I will definitely do that. Thank you very much indeed for the advice!!

Museums in Germany do not tend to be very helpful, so I never considered contacting Bovington.

With best regards,

Martin



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Colonel

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They are very helpful, if you have any trouble let me know.



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Legend

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I'm very impressed with your model so far; 1/16 RC sounds like something worth looking forward to, so I was wondering, given the weight of brass/copper, what motors you plan to use and other details of the electrics. I've had thoughts of building an RC tank myself in a scale up to 1/16, either using styrene sheet or plywood, as these would not exceed the limits of my long-unused (and modest) skills, but can only think through things for the foreseeable future as I'm nearing the end of a degree and have to focus on study and finding work first.
I know that Tamiya's 1/16 tanks, which weigh around 4kg, use 370-size motors, except for the larger, presumably faster ones like their Leopard 2A6, which uses 540s.
A WW1 tank can be geared down a lot more to obtain a scale speed (just 4 inches/10cm per second for MkIV at 1/16), so I doubt a plastic or thin plywood tank would need more than 380 size motors, but in metal there must be several kilos at least to shift.
Also, are you planning to use 2.4GHz radio?

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MRG


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Hello TCT,

thank you!

I am trying my best to make this as close to the original as possible. Although a lot of it is brass and copper, the main body perts are copper plated circuit board. It is light, sturdy - and you can solder and glue it.So the weight will not be so bad in the end.

For motors, I am using these here. They are 540 motors with a planetary gear box, transmission will be via bevel gears and belt to the rear drive wheels. Various gearings are possible this way, but if my calculations are correct, these should be right for the job.

The controls will be very simple, 27 mHz, from the Heng Long tanks. The good thing about them is that they have engine sounds and various extras all ready. There are some simple tweaks to the controls possible to get more options, as I plan to have the turrets in the sponsons moving about.Best thing is, you can hardly beat the price...

If I see the necessity, I can always upgrade the controls and get more sophisticated gear, like the Elmod tank controllers or a programmable Beyer sound box, if I should ever get hold of the real sound of a Mark IV.

If you have more questions, please ask!

With best regards,

Martin



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Hi Martin,

 

".....if I should ever get hold of the real sound of a Mark IV....."

 

a quick search under Mark IV tank mp3 turned up this

http://www.filestube.com/m/mark+iv

 

Cannot vouch for the security, quality etc but you may want to have a look.

Keep posting the pics - it looks faulous so far.

I may be going to the Australian War Museum in June so if you are after any specific pics let me know and I'll see what I can chase up

 

HTH

Greg  biggrin



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Legend

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MRG wrote:

Although a lot of it is brass and copper, the main body perts are copper plated circuit board. It is light, sturdy - and you can solder and glue it.So the weight will not be so bad in the end.

The controls will be very simple, 27 mHz, from the Heng Long tanks.


 Circuit board? Ingenious, I would never have though of it. Copper plated is the natural state for the stuff, I remember we made printed circuit boards in sixth year at school by etching most of the copper away.

Heng Long does indeed look like an excellent value way to get some parts; I was pleasantly surprised to find you can get twin motor and gearbox sets with metal gears for just £20. 

All you need then is to use a smoke generator and have a little fan to blow it down the exhaust pipe in sync with the 'engine' - allowing the smoke to waft out lazily when 'idling'.

I don't know how the mortar trials on the back of the MkIV tadpole went during the war, but it occurs to me that any mortar crewmen would probably have been gassed by the dense clouds of exhaust smoke between the track horns if it had been tried in action!



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Hero

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Hiya,

First off... Fantastic Model xx

As regards the door mechanism... IF it is the same as used on the MK1 sponson door, then it looks like this....

Helen x



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MRG


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Hello Helen!

 

Thank you very much for your response and the photos!

I think the mechanism is rather different though, as there is this disk with the square hole on the outside which I believe was some kind of lock.

The bolt positions of the mechanism are clearly seen from the outside views, but with the unclear pictures I can find from the interior views, I cannot make out how this might have worked.

I even tried to be creative, thinking "how would I construct that door lock" making several latch- and lever designs on the given bolts but it just does not come out right.

However, I am in contact with Bovington now to get that construction drawing., I will certainly post the finished results.

 

With best regards,

Martin



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MRG


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Hello TCT,

using circuit boards is clever, but it is not my idea - I had seen the building report of a guy making an excellent Skoda 38t tank model with those.

Copious amounts of smoke are planned, the silencer and exhaust is built accordingly. Here are the inlets, ready to connect some rubber tubes to my smoking unit. wink

DocMarkIV-025.jpg



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Legend

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Excellent! I'll look forward to more posts as you progress.

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Legend

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I've looked at the original landships site, and the pictures of Flirt II are clearer there - plus you can click to magnify them and they expand to a higher resolution than what you get if you open the Landships 2 versions in a new window and zoom in.

The two pics of the rear of the tank show the inside of the open door better, and unless the door of Flirt has been tampered with, it looks like the handle is a very simple swinging latch with the knob at the free/moving end and the pivot at the point where on the outside of the door there is a solitary nut at the right hand side.

You can also see something of the periscope box for the viewing slit at the top of the door, plus some other details - though all is not totally clear.

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Legend

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That's weird - it's exactly the same image on Landships I & II. If you right click on an expanded image in Landships II most browsers will allow display of the image in a separate tab.

Regards,

Charlie



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Legend

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Yes, I'm able to view Landships II pictures in a separate tab, but if I then zoom in, the resolution is lower than that of Landships I versions of the same pics - certainly for the aforementioned pics of Flirt II. I also find that the photo of a MkIV tadpole at Dollis Hill, front quarter view (on the MkIV article, Landships II), actually SHRINKS when I click on it, leaving it slightly SMALLER than the thumbnail. I've noticed too that the profile pic of a tadpole outside a factory (MkIV article on LS II) is taller than the equivalent on LS I, showing more of the background - so there must be a variety of subtle differences between the photos on the two sites, even if there aren't meant to be.

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MRG


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Hello again!

Thank you all for your great help!

I gave in to temptation, took an extra day off for this passed weekend and drove the 580 km to Brussels on Friday afternoon to thoroughly inspect "Lodestar III".

I had goosebumps when I first approached it, the tank looming there at the rear end of the relatively dark hall, the Whippet next to it and the Fokker Triplane above.

Reading about German soldiers surrendering just like that when the tanks approached is totally understandable to me now.

The museum staff were very helpful and kind indeed, they even gave me a large ladder so that I could make pictures of the roof. I wish I had more than only two thumbs to hold up for the staff! Great guys. I spent the entire Saturday with Lodestar (only interupted by the weird lunch break the museum makes) and came back for more on Sunday morning.

This way I was able to take details that I could not find anywhere on the net, like the front end of the silencer, the hinges of the conical roof turret, the shaft behind the ventilation gills and the look of things behind the upper rear armour plate.

I was able to pick up and note a lot of small details, like the imprinted registration number on the front glacis nose girder, some graffiti (which might have been done by one of the original crews, to be researched yet), the painted over "L47" on the rear upper plate and so much more.

The door lock mechanism of the rear door is identical to the one on the left sponson door. So Helen's guess was correct, if you take a Mark IV sponson door into account. Why didn't I think of that before? The images of Flirt had been misleading me, finally the answer was very simple indeed.

I reached through the Lewis gun port and made some "endoscopic" pictures with my camera. Not good ones, but very enlightening.

Calling that thing a "door" is too much, I was rather shocked to see how small it actually is. Sure, I would be able to squeeze through if I would have to, but surely only in cases of emergency. I am amazed the designers put it there at all.

It is weird how working on the model inflated my expectations on the actual size of things.

I am not small - but at 182 cm not super tall either. I would not have been able to stand upright inside the vehicle - and how the crew managed not to be knocked senseless by all those corners and protuding bits inside when going over rough terrain will ever be a mystery to me.

Anyway, I have enough information to keep me busy for weeks now! biggrin I will make an according detailed building report, but this will surely be better positioned in the modelling section of the forum.

And - if I  can help with questions now, I certainly will! Just send me a note.

Please understand that I promised not to publish the photographs I made on the internet, but I can send you the odd picture on a private basis.

With best regards, and thanks again,

 

Martin

 

PS: The Atomium is also worth a visit.  wink



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Legend

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You drove 580km to see it? That's commitment!

I'll look forward to hearing more in due course; the only question I have just now is about markings: have you decided on a particular tank to represent when it comes time to paint it?


TCT

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MRG


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Well, sooner or later I just had to make that drive... and a little madness helps when making such decisions! biggrin

I am not 100 % sure, but as I am bit of a a cynic myself, it is probably going to be this one: C22 "Cynic", a female.

Cynic

(Does anyone here also think they look like Aztec idol statues with those fascine bundles on top?)

At least here I can see the exact lettering of the name in the front - and I can more or less guess what the rest of the markings looked like, as I found some other pictures of C-company tanks from the rear. And now I also have a good idea about the original colour.

The airbrush will stay in its box, these tanks were certainly coated by means of a brush, so I will replicate exactly that by using small fine brush strokes.

With best regards,

 

Martin



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Legend

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MRG wrote:

Cynic

(Does anyone here also think they look like Aztec idol statues with those fascine bundles on top?)


 No, can't say it occurred to me - but since you mention it, I can just about see what you're getting at.



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