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T-72M

September 11th, 2011 Leave a comment Go to comments

Model of a Cold-War era Soviet main battle tank. Features suspension, rotated turret, elevated main cannon and lights.  

Datasheet:

Completion date: 10/09/2011
Power: electric (Power Functions)
Dimensions: length 39 studs (52 studs including main cannon’s barrel) / width 19 studs / height 16 studs (not including antenna)
Weight: 1.057 kg
Suspension: torsion bars
Propulsion: 2 x PF Medium geared 1:1
Motors: 3 x PF Medium, 1 x micromotor
Top speed: 1.14 kmph

T-72 is one of the most popular tanks in the modern world. It has been produced for 40 years now, and the production still continues with over 25,000 total tanks built. It was designed with cheap mass production and maintenance in mind. It offers interesting blend of simplicity and good characteristics, and it generally follows the Soviet doctrine of focusing on quantity rather than quality of tanks. While the T-72s can be easily gathered in large numbers, they usually lose 1:1 encounters with Western tanks.

I have chosen this particular tank because it’s a great example of Cold-War era Soviet tank design, with flattened hull and small, bowl-shaped turret. The US intelligence nicknamed the turret “Dolly Parton” because its shape supposedly reminded her breasts (you are strongly advised NOT TO search for photos of Dolly Parton, for the sake of your good taste). I had two goals while building it: to test the torsion bars suspension in a lightweight model, and to see how small fully motorized tank model can I build.

As for the aesthetic side, there was a number of minor shortcomings. I wanted to properly model the distinctive shape of the turret, because Lego models of the T-72 usually have turret shaped like a slightly gnawed disc. I think I achieved that, at the cost of attaching some details to the bottom of the turret, thus increasing the gap between the turret and the hull’s upper surface. The turret also had very little space inside – so little, in fact, that the majority of the main cannon elevation system had to fit in a 2 studs wide gap.

Other than that, the central section of the main cannon’s barrel should have been slightly thicker, but the only idea that occurred to me was to wrap it in a paper of similar colour and let it pass for a sticker.  I also had the impression that the hull is slightly too tall, even though I was sure it had the right proportions. I could have remedied it easily by decreasing the suspension’s angle and thus the ground clearance, lowering the entire tank, but the large ground clearance is distinctive for the T-72. Perhaps the reason was that the side skirts started a little higher than they do in the real tank.

The T-72 is unusual in how its details are distributed: there is a lot of details on top of the hull’s rear, but almost nothing on the side skirts and above the tracks. I have added some extra details to simulate the kind of “luggage” that some tanks carry on them – in some cases it seems that the tank’s crew grabs virtually anything that comes around and attaches it to the armour.  I have also used Lego LEDs to emphasize the large number of searchlights on the turret, which is very distinctive for the T-72, and I used some Lego plants to simulate the so-called environmental camouflage, just to see the result.

The model was very simple technically. There were two PF Medium motors in the back, connected straight to the rear tension wheels. Together they provided reasonable speed and a surprisingly high torque. The were also two IR receivers in the back, and another PF Medium motor between them, used to rotate the turret. Because of how small the turret was, its entire rotation system along with the turntable was located in the hull. The central part of the hull was taken by the turntable, and the front was taken by the 8878 battery lying transversely on its side. The battery could be accessed by removing the entire glacis plate. The remaining space, which was sparse, was taken by wires and the suspension system.

This was my second tank to use torsion bars suspension – the previous one was almost 3.5 kg heavy, with nearly 0.25 kg load per road wheel, and its suspension worked perfectly. Here the suspension was very similar, except that the axles used as the torsion bars were kept at fixed angle by the toothed half-bushes and toothed connector joints. It saved some space, but it wasn’t working really well because there were gaps at the half-bushes, which I had to fill with tiny scraps of paper. The average load was less than 90 grams per road wheel, and the entire suspension was therefore very hard – it was actually difficult to notice that it works.

I was happy with how the model turned out, even though its aesthetic side had a few compromises to it. It was a good, very agile model to play with, but I think it proved too light for this kind of suspension.

Work in progress photos:

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Photos:

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Video:

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Categories: Military Tags: , ,
  1. BF Nelis
    April 14th, 2014 at 22:37 | #1

    Thanks, I bought it, it’s very useful for building my own tank. Probably the Leclerc tank, trying to improve yours ;)

  2. Sariel
    March 27th, 2014 at 18:19 | #2

    @BF Nelis
    I did. Check my book.

  3. BF Nelis
    March 27th, 2014 at 17:34 | #3

    Hi Could you do some tank suspension toturials for us? i would really appreciate that

  4. Sariel
    November 23rd, 2013 at 14:10 | #4

    @Rijk
    Maybe in the future.

  5. Rijk
    November 23rd, 2013 at 10:17 | #5

    Hi Sariel. Did you consider offset road wheels? If you place the road wheels offset, the torsion bars can be made longer, resulting in a less hard suspension. I haven’t tested it since I don’t have the pieces, but it might be an idea for future models. It’s a technique used in real tanks as well.

  6. Sariel
    September 20th, 2013 at 22:27 | #6

    @Jirka
    I don’t sell any models, thank you.

  7. Jirka
    September 20th, 2013 at 22:11 | #7

    You have a lot of great models in stores and you earned on it. Would you create your business?

  8. Jirka
    September 20th, 2013 at 22:09 | #8

    Hello, I would like to ask if you could sell for a price guide. thank you

  9. Sariel
    July 29th, 2013 at 20:23 | #9

    @Jirka
    It’s not for sale, just like all my models.

  10. Jirka
    July 29th, 2013 at 20:05 | #10

    Hello, I would like to ask when the tank T-72M for sale. Thank you.

  11. Miguel Aresta
    May 5th, 2013 at 17:41 | #11

    Hey! Awesome machine ! You are an awesome builder Sariel,I love both military stuff and legos as well but you must have been mistaken abaout that particular T-72..
    The T-72M is an export version of the T-72A (the real Dolly-Parton) and no,the T-72A wouldn’t be killed by any western tank in a 1:1 fight(theoretically of course) ,but either ways I love your builds so thumbs up!

  12. Ali
    February 26th, 2013 at 21:18 | #12

    @Sariel
    Ok, thanks a lot.

  13. Sariel
    February 26th, 2013 at 16:09 | #13

    @Ali
    The wheels are definitely too close to each other. If the tracks keep falling off, try replacing wheels with 24t gears, they come in black too.

  14. Ali
    February 26th, 2013 at 15:24 | #14

    Hi again Sariel,

    What do you think about this kind of suspension? http://postimage.org/image/489ebz11d/
    The problem is I can’t steer the tank on carpet so well, someitmes the tracks fall off, is it the design faulty or the tracks are not robust enough?
    Also if the tank needs to override larger obstacles, the first wheel hits the 2nd wheel from front and the wheel falls down, cause the tracks don’t follow their course anymore… If I try to make the tank larger and make a 1 stud space between them may it help? I can move the front gear as weel, but I don’t think that would change anything, what do you think about it? Your answer will save me precious time, thank you! :)

  15. Ali
    January 3rd, 2013 at 14:28 | #15

    @Sariel
    Ok, thanks for the info.

  16. Sariel
    January 3rd, 2013 at 00:17 | #16

    @Ali
    Torsion bars can twist and untwist, so they work in both directions, but to a limited degree. And they have to be twisted before they can untwist. As for the battery box – sorry, it’s impossible to tell.

  17. Ali
    January 2nd, 2013 at 21:55 | #17

    Hello again Sariel, does the torsion bar suspension work in each way ( forward and backwords)? Also if I would install a small battery box in a similar sized tank as yours with 3x medium motors, lights and 1 micro motor, aprox how much time would it last? Less than 30 min?

  18. Robert
    December 16th, 2012 at 16:53 | #18

    Hi Sariel,I have managed to find a brick built alternative for the turret and my tank will be on youtube soon

  19. Ali
    December 13th, 2012 at 15:42 | #19

    @Robert
    Thank you Robert! :)

  20. Antony
    December 13th, 2012 at 14:06 | #20

    @Sariel
    thanks :D

  21. Robert
    December 12th, 2012 at 21:28 | #21

    @Robert
    ps you need 2 of the gears

  22. Robert
    December 12th, 2012 at 21:27 | #22

    @Ali
    you would need a barious range of peices including:

    http://www.bricklink.com/catalogItem.asp?P=4716 and

    http://www.bricklink.com/catalogItem.asp?P=2856c03 or any similar pieces

    so then you biuld a frame around this, attach the moter to the worm screw, which then in turn powers the turntable

    @Ali
    you would need for the drive:

    http://www.bricklink.com/catalogItem.asp?P=6589

    so you can transfer the drive round the corner and then you need

    http://www.bricklink.com/catalogItem.asp?P=32324 to hold the gears in place

  23. Ali
    December 12th, 2012 at 21:14 | #23

    @Robert
    Thank you Robert, but I already have those two pieces, what else would I need?

  24. Robert
    December 12th, 2012 at 20:47 | #24

    @Ali
    you would need a barious range of peices including:

    http://www.bricklink.com/catalogItem.asp?P=4716 and

    http://www.bricklink.com/catalogItem.asp?P=2856c03 or any similar pieces

    so then you biuld a frame around this, attach the moter to the worm screw, which then in turn powers the turntable

  25. Ali
    December 12th, 2012 at 18:55 | #25

    @Sariel
    Of course I did, but I don’t know how you built the mechanism.

  26. Sariel
    December 12th, 2012 at 18:06 | #26

    @Ali
    Why don’t you look at the Work In Progress photos of my tanks? There’s a turntable shown right on this page.

  27. Ali
    December 12th, 2012 at 15:52 | #27

    Hi Sariel, I am making my own tank, already bought tracks, I don’t know how to drive the power from the motor for the turntable and what pieces to use, could you kindly help me? I am a bit confused about this one, thank you!

  28. Sariel
    December 9th, 2012 at 22:25 | #28

    @Robert
    I think it can be hard to find a good-looking alternative for them.

  29. Robert
    December 9th, 2012 at 18:21 | #29

    Ihave just started making my own T-72 but I do not have any of the peices for the turret that you have so what do you suggest, buy them or find a brick built alternative

  30. Sariel
    November 16th, 2012 at 23:40 | #30

    @Antony
    It’s called chain link.

  31. Antony
    November 16th, 2012 at 23:03 | #31

    Hey sariel i love your creations. im making an LAV but i only got 2 motors so im making the rest of the weels powered by chain from the motor( idk if is clear :P) but i cant find the chain you also used in the drone in your APC. its like these ones caterpilars but without the length added. How is it called in bricklink?

  32. Cody
    January 18th, 2012 at 01:23 | #32

    @Sariel

    Thank you :3 I really needed that xD

  33. Sariel
    January 17th, 2012 at 08:05 | #33

    @Cody
    At Bricklink.

  34. Cody
    January 17th, 2012 at 04:43 | #34

    I was wondering, Could you please tell me where you get the pieces for the rotation of your tank turrets? Im making tanks myself, Not based of real ones, But itd really help. Thanks.

  35. Sariel
    December 26th, 2011 at 23:55 | #35

    @dragonifos
    On jest o wiele za miękki i za mało elastyczny.

  36. dragonifos
    December 26th, 2011 at 23:50 | #36

    Witam
    Chyba na Lugpolu ale teraz dokładnie nie pamiętam pisałeś, że to zawieszenie nie działa zbyt dobrze. Chyba mam rozwiązanie tego problemu. Mianowicie axle od wachaczy nie montuj na sztywno tylko poprzez: Axle Connector Double Flexible (Rubber). Co o tym myślisz?

    Pozdrawiam
    Marcin

  37. Sariel
    December 21st, 2011 at 20:15 | #37

    @jostein
    Sorry, I don’t make instructions. And this model has been taken apart a while ago.

  38. jostein
    December 21st, 2011 at 19:53 | #38

    hello my dad love trains from the war an he want this whith his collection of tanks so can you make a instruction to me and my dad if somone ask we will say thath you maked it do can you sen a instruction please

  39. Sariel
    December 2nd, 2011 at 08:13 | #39

    @Josh
    Sure. Rammstein rocks my socks! :)

  40. Josh
    December 2nd, 2011 at 02:15 | #40

    Sariel- Do you really like Rammstein? I hear their songs in your videos. If you do, awesome!:)

  41. Sariel
    November 25th, 2011 at 16:28 | #41

    @Kshomiv
    I have absolutely no idea.

  42. Kshomiv
    November 25th, 2011 at 16:17 | #42

    How many track links are there in each track?

  43. Sariel
    November 24th, 2011 at 14:48 | #43

    @David
    No.

  44. David
    November 24th, 2011 at 14:39 | #44

    Hello, Great model !!! do you have instructions, I’d like to build it,

    many thks, BRgds David

  45. Kshomiv
    November 20th, 2011 at 15:56 | #45

    I hope to build a tank soon. I just need more parts.

  46. Kars
    November 16th, 2011 at 19:30 | #46

    I have found it.

    Many thanks to upload your videos.

  47. Sariel
    November 15th, 2011 at 21:17 | #47

    @Kars
    I have shown it in the video and described in the text. Use your eyes.

  48. Kars
    November 15th, 2011 at 19:12 | #48

    How did you make to elevat the main canon.

    MVG Kars

  49. Sariel
    November 10th, 2011 at 00:54 | #49

    @Kenneth
    I believe you’re referring to a minifigs’ camera.

  50. Kenneth
    November 10th, 2011 at 00:02 | #50

    what is the piece attached to the side of the gun that’s fixed on the rear of the turret?

  51. Sariel
    November 6th, 2011 at 13:24 | #51

    @capmalo
    Somewhere where you can’t get one anymore.

  52. capmalo
    November 6th, 2011 at 12:12 | #52

    Where you bought it ?
    Thanks

  53. Sariel
    November 6th, 2011 at 02:06 | #53

    @capmalo
    It’s a micromotor. And it’s extremely rare and expensive.

  54. capmalo
    November 6th, 2011 at 00:17 | #54

    What is the reference of the motor you are using to go up and lower the gun ?
    thanks for your reponse

  55. AS_PL
    October 26th, 2011 at 19:52 | #55

    Hm, skoro tak to rzeczywiście musi być mocna. W życiu bym takiej chyba nie wymyślił. :) Muszę to dzisiaj przetestować. ;D

  56. Sariel
    October 23rd, 2011 at 19:40 | #56

    @AS_PL
    Pęknie? Wolne żarty. Tyle samo osiek miałem w modelu Leoparda 2A4 który ważył 3,5 kilograma, tam naprawdę mocno pracowały i nadal były w stanie idealnym.

  57. AS_PL
    October 23rd, 2011 at 18:21 | #57

    Bardzo dobry podkład muzyczny, idealnie komponuje się z moim gustem. ; ) Mam nadzieję że będziesz podobny stosować jak najczęściej.
    Wracając do modelu – wg mnie jest piękny. Tylko razi mnie trochę ta… Hm… Amortyzacja? Nie ma przypadkiem ryzyka że któraś ośka pęknie? Czy coś? I jak dla mnie trochę ubogi ten “kamuflaż” jest. Tzn. te liście… No ale może to może tylko moja natura do narzekania. ; )
    Powodzenia w budowie przyszłych konstrukcji!
    Pozdrawiam,
    Karol M.

  58. Sariel
    October 5th, 2011 at 11:54 | #58

    @Gamali1el
    Mam luźny pomysł na zawieszenie tego typu. Ale strasznie razi mnie w oczy wieża produkcyjna Tygrysa Królewskiego. Zwykły Tygrys jest dużo zgrabniejszy.

  59. Gamali1el
    October 5th, 2011 at 11:40 | #59

    Wiem ale żaden nie spełnia moich oczekiwań… Ich zawieszenie jest albo sztywne, albo nie przypomina prawdziwego. A Królewskich tygrysów z Lego jest mało.

  60. Sariel
    October 4th, 2011 at 23:31 | #60

    @Gamali1el
    Grałem, znam. Jest już całkiem sporo Tygrysów z klocków.

  61. Gamali1el
    October 4th, 2011 at 21:14 | #61

    Aktualnie gram w grę MMO World of Tanks, jest tam sporo czołgów a następne będą wprowadzane. Myślę, że niektóre modele mogą być inspirujące. Chciałbym zobaczyć Tygrysa Królewskiego wykonanego z Lego… ;) Zwłaszcza jego zawieszenie.

    T-72 przecudny, zresztą jak wszystkie Twoje modele ;) Chętnie pobawiłbym się klockami, niestety swoje oddałem kuzynowi a na nowe mnie nie stać… Pozdrawiam i czekam na nowe cuda ;)

  62. Sariel
    September 27th, 2011 at 21:13 | #62

    @Ghone Bannon
    Sure, would you like some fries with it?

  63. Ghone Bannon
    September 27th, 2011 at 19:33 | #63

    Make a lightweight tank with a 2-speed gearbox and twin RC motors

  64. Sariel
    September 23rd, 2011 at 00:17 | #64

    @john
    Not permanently. Once the load is gone, the axle is perfectly fine.

  65. john
    September 22nd, 2011 at 22:31 | #65

    interesting. it doesnt twist the axle used for it too?

  66. Sariel
    September 22nd, 2011 at 22:12 | #66

    @john
    You mean the torsion bars? No, they wouldn’t break easily. They survived in my previous 3.5 kg heavy tank without any damage.

  67. john
    September 22nd, 2011 at 21:12 | #67

    ahm ok, sorry for not following rules. i wasnt try to brag or anything. btw shocks for your t-72 is compact and easy but wouldnt it break easily too?

  68. Sariel
    September 22nd, 2011 at 08:13 | #68

    @john
    Good for you, but this really has nothing to do with the T-72, does it? Please keep comments on the topic.

  69. john
    September 22nd, 2011 at 03:23 | #69

    im so happy! my unimog was chosen as the 10 finalists for “take the challenge’! you should check mine out and of course the others to vote! my username is kusogaki

  70. shawn
    September 20th, 2011 at 17:35 | #70

    No, but it is a craft that destroys, and there was destruction that day. (I’m not american, by the way.)

  71. Sariel
    September 19th, 2011 at 23:26 | #71

    @shawn
    Is it? Last time I checked the Soviet tanks weren’t involved in 9/11.

  72. shawn
    September 19th, 2011 at 14:14 | #72

    Ironic the day that you posted it.

  73. Sariel
  74. jade2448
    September 18th, 2011 at 21:09 | #74

    what is the piece # for the treads?

  75. Sariel
    September 18th, 2011 at 18:18 | #75

    @john
    No. I don’t participate this competition at all.

  76. john
    September 18th, 2011 at 17:37 | #76

    did you upload unimog for the “take the challenge”?

  77. Sariel
    September 18th, 2011 at 01:02 | #77

    @Tholias
    Oh well, I just changed my mind :)

  78. Tholias
    September 17th, 2011 at 19:01 | #78

    I was under the (perhaps mistaken) impression that you would not make Soviet/Russian tanks?
    Not that i complain, i merely find it curious…

  79. max
    September 17th, 2011 at 17:16 | #79

    nicely built

  80. Sariel
    September 12th, 2011 at 00:48 | #80

    @Michal
    Niewykonalne. Drążki są wtedy zbyt blisko siebie i nie ma miejsca żeby je zablokować pod kątem.

  81. September 11th, 2011 at 23:51 | #81

    Co do zawieszenia na drozkach skretnych – jezeli estetyka za bardzo nie ucierpi, to mozna sprobowac drazkow na cala szerokosc kadluba – na przemian dla lewego i prawego wahacza.
    Spowodowaloby to asymetrie kol, ale dwukrotnie zmiekczylo zawieszenie.

  82. Sariel
    September 11th, 2011 at 21:22 | #82

    @mr32bit
    Um… external fuel tanks. Most modern tanks can use these, you know.

  83. mr32bit
    September 11th, 2011 at 20:26 | #83

    What are the barrel looking things hanging off the back?

  84. Sariel
    September 11th, 2011 at 17:49 | #84

    @Konrad
    Gąsienice są za delikate na teren. Rammstein – Moskau.

  85. Konrad
    September 11th, 2011 at 17:46 | #85

    Super.

    Fajnie Jeździ po książkach ciekawe jak w terenie? Może nakręć coś w terenie?-Było by miło :)

    Zielsko się sprawdziło. ;D
    Dobre dopasowanie piosenki. Mogę prosić nazwę?

    Pozdrawiam

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