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Medium Tank

December 25th, 2008 Leave a comment Go to comments

My second tank, features a drivetrain with the subtractor, more advanced suspension, a headlight, rotated turred and elevated cannon.


Completion date: 22/07/2007
Power: electric (wire-controlled)
Dimensions: length 30 studs / width 20 studs / height 12 studs
Weight:  0.82 kg
Suspension: pendular bogies / independent with shock absorbers
Motors: 2 x RC, 2 x 71427

Second take on the subject of the tanks. Very similiar in size to the first tank, but lower and wider, which makes for a more realistic look. The drivetrain is exactly the same – two RC motors with a subtractor between. The suspension is somewhat more advanced, by the addition of an amortized rocking levers in front. The turret is rotated by a motor inside the hull, and inside the turret is a motor that elevates the cannon. All the wires exit through the hull this time, and the hull’s sides are protected by the openable side courtains. I have bought a black 8×8 plate with grill specifically to place it above the motors, so that some internal parts could be seen. There is also LED brick from the Exo-Force sets located in the front part of the hull.


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  1. Sariel
    February 22nd, 2010 at 17:05 | #1

    @Mihály Stépán
    No, it should be fine, but it also depends on the size of the drive wheels and the surface you’re driving on.

  2. Mihály Stépán
    February 22nd, 2010 at 16:54 | #2

    Does a 1-1,5 kg vehicle give a hard time for an XL motor? Using say, 20t to 28t diff ratio.

  3. Sariel
    February 5th, 2010 at 10:58 | #3

    @Mihály Stépán
    Depends on what you do with the motors. If they are heavily loaded, they drain batteries pretty fast. The new 8878 battery is supposed to last to up to 4 hours when fully charged.

  4. Mihály Stépán
    February 4th, 2010 at 18:12 | #4

    Speaking of which, if you have a model with like 6-10 motors, how often do you need to recharge the batteries? I guess those XLs use up quite a load of energy..

  5. Sariel
    February 3rd, 2010 at 12:07 | #5

    @Mihály Stépán
    Exactly. Additionally, with a subtractor you can use 2 different motors and the tank will always go perfectly straight. You can use a strong motor for drive and a weak one to steer, which is more efficient than using two strong ones.

  6. Mihály Stépán
    February 3rd, 2010 at 11:59 | #6

    Aha! So that’s the trick! 😀 The subtractor lets you control the tank in a precise manner, and the speed control just refines that.. I get it now…

  7. Sariel
    February 3rd, 2010 at 10:12 | #7

    @Mihály Stépán
    Yes, it is difficult as there are delays when you speed-control two motors at the same time. It’s very inaccurate, e.g. starting straight ahead is almost impossible. I have subtractor + speed control in my new tank and it works like a charm.

  8. Mihály Stépán
    February 3rd, 2010 at 08:56 | #8

    Ok, but seems to me that you can do exactly these (turning in arch etc) with speed controlled motors for the individual tracks. I was asking because as I know your work, you tend to use the simpler mechanism if it can do the same as the more complex. Is it difficult to speed control the motors in a precise manner?

  9. Sariel
    February 2nd, 2010 at 10:21 | #9
  10. Mihály Stépán
    February 1st, 2010 at 19:46 | #10

    It might be a stupid question, but if you already have two motors for driving a subtractor, then why not power the treads independently by their own motors? I mean, then you don’t have to mess with a lot of gears the subtractor needs…

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