Tank build: GPM Challenger 2, RC conversion

Discussion in 'Armory & Military' started by Lex, Jan 22, 2008.

  1. Lex

    Lex Dollmaker

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    Armour panels... These grazes the ground often, so can't be made with paper.
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    More armour panels... This time it's paper for sure
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    Rivets :eek:
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    Finished armour, now onto something else,... what IS this thing...
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    ...Ah right, it's the front panel :rolleyes:
  2. Lex

    Lex Dollmaker

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    ...Finally, the instrument of destruction has arrived...... announce1
    This!
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    This stuff is used on Japanese toy arms, so...
    Specs: 104x50x26 mm, operating under 7.2 Volts, operation current 6.6 A... Yes that's right, Amps, not milliamps! Projectile is 0.2g BB bullets, nozzle velocity can reach 90 m/s!:eek: Penetrates a beer can in a single shot!:eek::eek:
    And guess the firing rate? more than 10 rounds per second, yes per SECOND!:eek::eek::eek:

    But since the way it's arranged doesn't fit the turret, extensive modification is needed once again......... And the vibration during firing could rip the turret itself to pieces, so the turret must be extremely strong...
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    Strengthened by epoxy from inside... Absolutely no defect tolerated
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    Shaft is also made to be the maximum strength...
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    Looks dirty now, but it'll have a paint job in the end ^^
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    Turret, the base is 2 layers of 1mm cardstock.
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    Tracks to restrict movement...
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    The bullet feeder, with spring inside
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    --That nut on top is mobile. Sorry not much paper used
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    Final assembly
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    Motor to drive the feeding mechanism
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    Looking great, but the turret's base has been enlarged by 5 mm radius to fit the entire mechanism...

    Testfire, result in just FIVE seconds!!! :eek:Shells fly straight in 30 metres range, but after that still carries a great momentum. If shooting against wall, the BB bullets will just shatter to dust... This is the toy of God >_<
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    Sideword, Leo has also kindly provided us with a live demonstration of modeling safety... It happened when a small part he was cutting suddenly decided to give way, and so the razor went on to slice through a good portion of the thumb... A nice number of stitches and a lovely visit to the hospital, whether the skin lives is still a question, if not our Leo would have to get a skin graft......wall1 It might be that God isn't allowing such a deadly land weapon to be born.............. A picture is worth a thousand words, guess I don't need to remind about taking extra care with knives. (That's why scissors rule!!:mrgreen:) Take care Leo, hope you get back to this project soon ^^
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  3. Gixergs

    Gixergs Well-Known Member

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    Youch!!!:v8: sorry to see about the hand injury, been there ,done that bought the the special protective glove. I hope he recovers soon and that there is no perminant damage. Although judging by the incredible work on the tank knocking up a Cybernetic Hand out of card wont be to much of a problem. Thanks for sharing this amazing build of a somewhat frightening weapontrain97 Please pass on my best wishes and hopes for a complete and speedy recovery.
  4. cgutzmer

    cgutzmer Guest

    OWWWW!!! :(

    even those fiddly bits are works of art by themselves!
    Chris
  5. lriera

    lriera Member

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    Oooohhh. I am sorry for that domestic incident and wish Leo a quick recovery.
    I am learning a lot with his pictures and your explanations.
  6. Lex

    Lex Dollmaker

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    Not actually an armor guy myself, but I am also learning a lot from this build. I will keep this thread updated when there's more progress...
  7. Elliott

    Elliott Senior Member

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    Yikes! That had to hurt considerably. I too was learning as the thread went along and am looking forward to its continuation upon Leo's complete and full recovery. Thanks for bringing this thread to our attention Lex.

    Elliott
  8. Lex

    Lex Dollmaker

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    Finally, recovering from the injury... Leo had more progress on the mechanisms (this was back in February, but I only checked back now... sorry my bad :p)

    One problem that arised was the bupply system not keeping up with the firing speed, this was due to friction and the speed which the shells enters the cannon.
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    The mechanism was dismantled, ground and polished, and installed back on.
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    The cannon and the gears were further strengthened
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    Modification on the entry cavity, added a mechanism to aid the BB shells coming into the cannon.
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    The motor was installed on a spring, to give a better fit for the gears.
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    The system was connected with sockets, to aid maintenance. After the conversion, the supply mechanism is able to keep up sign1
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  9. Lex

    Lex Dollmaker

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    A little reinforcement on the driving wheel... Just so that the axle can actually drive the wheel
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    The main motor...
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    Leo also removed a gear wheel, further upping the rotation speed
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    The motor used is well... Probably Western people doesn't know much about Mini 4WD track racing cars by Tamiya but... It's something Chinese and Japanese children have been indulged in during the nineties (yes including me :rolleyes:) This motor is one of the hi-end motor upgrades in the series, operating at 3V uses a current of... 10 A! Of course this is too unsuitable for an RC tank... So Leo ripped the thing apart (after a test drive ripped the wiring connections apart) and re-wound the rotor core himself. The final version consumes a maximum current of 3A.

    ...And this is the elevation control...
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  10. Lex

    Lex Dollmaker

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    Moving on to the rotation mechanism
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    Preform...
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    Reinforcement...
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    A switch mechanism is added, so when the rotation reaches the end the motor is automatically turned off
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    So that was the turret end of things...

    Onto the fuselage (or what's it called...?)
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    Radiators
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    ...Awesome!

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    Anybody explain this...? I soooo wish I did electronic engineering instead >_<
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  11. Lex

    Lex Dollmaker

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    At the time of spring festival, Leo continued the work on the Challenger
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    That was the removable cover for the top of the chassis (oh yes that's the word!) One side is a socket, the other side was a screw.

    Smoke generator!
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    Opening for the smoking oil (whatever that's called)
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    Scratchbuilt details... (actually the real wires are on the inside :p)
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    The observation window is also lighted!
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    Leo cleverly hides the switch...
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    --The beauty is on the inside...! Or otherwise?
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    Plenty, plenty of wiring to do...
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    ...The end is in sight! Everyone wants to see the model in action don't we?
    http://www.tudou.com/programs/view/8L3DMHL4CHI/
  12. NOBI

    NOBI Active Member

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    jawdrop jawdrop jawdrop jawdrop jawdrop

    Absolutely stunt...
  13. atamjeet

    atamjeet Member

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    Amazing, Astonishing, why I am not able to make such things..... This Forum really rocks, we get to see such a rare stuff whch we cant expect any where else. I salute the patience this guy has shown... Motivating... :)
  14. lriera

    lriera Member

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    I agree. It is a very incredibleg job. I congratulate you for all the solutions you have find.:thumb:

    Greetings.
  15. whatsyamac

    whatsyamac New Member

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    you rock man,
    you not only converted a paper model tank to rc, you even added a working gun and lights and stuff, that's great work, thats what i want to make, a working paper tank, your tread will be my holy grail of rc paper tank, i salute you
  16. luvecraft

    luvecraft New Member

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    This is amazing ! hope to see the finish product. a short video clip of the tank in action will be even greater!
  17. János1962

    János1962 Member

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    jawdropjawdropjawdropjawdropjawdrop:-o:-o:-o:-o:-o

    Excelllent work!

    Amazing, that's a good video!