Maggy, locked and loaded

maggy

Some readers may remember [Paul] from his project Jak, the blackjack robot; but his interests have moved toward coil gun creation. Maggy, his latest weapon, may not be the prettiest of coil gun we’ve seen, or the most environmentally friendly, but does look to be promising. Featuring a triple stage, logic based accelerator instead of the typical single stage, it can fire a 10 gram projectile (theoretically) up to 85 km/h! Check out how he’s gone from a single pistol to his current monster on his site, and a video of his work in progress after the jump.

Comments

  1. monkeyslayer56 says:

    sweet but would have loved to have seen it shoot something…
    btw ARDUINO lol

  2. Mic says:

    Perhaps they should have a vid of it shooting an arduino.

  3. MS3FGX says:

    It looks like the only part that is functional right now is the optical triggering, which currently only blinks LEDs anyway. It will be awhile before this is shooting anything…

    At the end of the video he mentions the capacitor charging system isn’t even finished yet.

  4. xrazorwirex says:

    And he’s got his handy dandy… netbook!

  5. durp says:

    85 km/h is pretty slow for a three stage with that mass of projectile.
    my 8 joule coilgun shooting 1 gram steel slingshot bb’s fires at 40 km/h…

  6. ASCII says:

    85km/h? That’s not that fast at all, only 77fps. To put that in perspective, one can easily attain 150fps with a blowgun…

    With a 3.5g dart you’ll get roughly 3.8j with the blowgun, with the theoretical 10g projectile you’ll get 2.8j with the coil gun.

    It’s very nicely done and a neat project, but I can see how this is still a fledgling technology.

  7. bigalexe says:

    The projectile is equivalent in weight to about 2 or 3 bullets for a .22LR. 10 grams is about 150 grains and a regular .22LR bullet runs around 40-60 grains. However the velocity on this gun has something to be desired, as stated in the first post its only doing around 77fps where many toy Nerf guns, more serious .177 BB rifles and I am pretty sure my hand can outpace easily.

    Also for those of you that aren’t firearms enthusiasts please note that I referred to the actual .22LR Projectile weight and not the whole thing so I did my math correctly.

  8. paul says:

    Exactly bigalexe,

    The weight of the projectile is 10 grams. Compare that to a 1 gram bb or pellet’s weight and there is a big difference :)

    As for the functionality, Its a work in progress. I update everything weekly and am planning on getting the Arduino control of the boost converter working soon. (I actually have the boost converter working already)

    The biggest hurdle atm is getting the capacitor banks to charge individually and discharge individually :/

    anyhow, thanks hackaday :D

  9. paul says:

    oh, and expect a cool paintjob and loading mechanism when its done for sure!

  10. Abbott says:

    paul, how about using a relay system to wire the caps together to become one large bank, then disconnect so that they are seperate banks?

  11. Jack says:

    Nice project … wouldn’t mind seeing it in action though.

    Also the still shot of the massive gun at the start and end of the vid isn’t a coil gun it’s a rail gun owned by the US Navy (i think…)

  12. babble says:

    Can you guys stop loading the article text with a million hyperlinks please.

  13. paul says:

    hey Abbott,

    thanks for the suggestion. I thought of that too, but another way is to use a ladder of diodes to isolate each bank, allowing charge in, but not out of each bank.

    I need to figure ut the size of the diodes needed tho.

  14. Frogz says:

    ….better idea..
    shoot an arduino
    WITH AN ARDUINO
    the thing i hate bout that type of plastic, if you heat it even a LITTLE too much, it bubbles internally

  15. Try posting coilguns when its an actual coilgun.

  16. sol says:

    @Anothercoilgun
    re: your linked page, Fascism?! Seems a little strong.

  17. Dan says:

    @Anothercoilgun

    The poster also has other complete coilgun proects on his site, the one he contacted hackaday to feature is the one that seems to be currently in development…

  18. Dan Fruzzetti says:

    Seriously I don’t know what to say about coilguns / magnetic projectile guns. Maybe the correct scale for these things is artillery-size, firing a several-pound projectile or larger.

    But the more I look at these little proofs-of-concept, the less impressed I am with the whole idea: a bullet weighs more than ten grams, goes much (much) faster than 85 km/h, costs nothing, and can be accurately fired from a weapon small enough to toss in a pocket and cheap enough to put them in everyone’s hand who wants one.

    plus at this size, you’re never going to get past the loss due to extra energy conversions.

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