Knex Grenade (Fragmentation)




Posted in PlayKnex

Introduction: Knex Grenade (Fragmentation)

A knex grenade with a working pin.
-Small, easy to conceal.
-Has a working pin.
-Nearly impossible for it to explode in your hand, unless you remove the pin.
-Easy to use.
-Has a small chance to not explode when thrown.
-Somewhat hard to build/rebuild.

Step 1: Materials

Gather the following pieces:
1 rubber band
-6 white
-3 blue (One is missing in the pic)
-1 white
-1 blue
-6 dark gray (optional)

Step 2: Step 1

Assemble the following:

Step 3: Step 2

Refer to video on how to attach rubber band.

Step 4: Step 3

Assemble the body of the grenade

Step 5: Step 4 (Optional)

Remove lid and insert gray connectors.
Then replace lid.

Step 6: Step 5

Practice building this grenade (or modify it) so you can build it without referring to this instructable!.

Step 7: How It Works

1) Removing the pin allows the rubber band to move.
2) Sudden movement (like hitting the floor) releases the rubber band, allowing the fragments to fly off.

Step 8: How to Use

1) Make sure that target is within range.
2) Remove pin.
3) Throw.
It may explode in your hand if you remove the pin, and wait before throwing.



    • Spotless Contest

      Spotless Contest
    • Colors of the Rainbow Contest

      Colors of the Rainbow Contest
    • Woodworking Contest

      Woodworking Contest

    We have a be nice policy.
    Please be positive and constructive.




    Wow, I've an amazing idea :D
    Put a rope on the firing pin, thorw your grenade away, hold the rope and the grenade will explode far away (unless you rope is short)!!

    1 reply

    This one just shatters, my HE grenade would works better with the rope.

    Um..........Can you help me on the rubberband step?

    9 replies

     Did u see the video on step 2?

    Yeah, I found out how to do it. But, When I throw it, It doesn't even twitch?

    Twitch? i think that u forgot to pull the pin...

    No. I pulled the pin. I even tried your HE grenade, and it also didn't explode! 

    Oh... I think i understand your problem now. Try using a smaller rubber band. If that doesn't work try to send me a picture.

    Um..................Would looping the band also work?

    I'll try it.

    The problem could also be that you didn't wrap the grenade with the rubber band correctly


    Oh well.

     Study the video. it might help

    missen one blue on the pic