Introduction: F25 Anti-Personnel Grenade

Picture of F25 Anti-Personnel Grenade

This is a new type of grenade that I designed

It uses a spring motor that is activated by pushing up the pin on the bottom (after being cranked) to fling shrapnel to distances not achievable by your average run-of-the-mill grenades...or should I say blunt throwing objects...*cough cough*. On average, this grenade can fling various shrapnel (green rods, ball joints and connectors, etc...) up to 25 feet. The best feature of the grenade, besides its blast radius, is how YOU DON'T NEED TO REASSEMBLE IT; you just reload the shrapnel, and toss again.

I also have a slightly different version of this that can be fired from a Knex RPG launcher!!!!! (coming later this year, because the M4 is using most of my pieces).

Step 1: Parts List

Picture of Parts List

I forgot to add in the white rods...there are 16 of them

Also, the invisible object next to the "=2" is a blue small gear

All black ball joints can be substituted by tan clips or similar pieces

Step 2: Build Some Parts

Picture of Build Some Parts

Here are a few necessary parts, build all shown in pictures.

Step 3: Begin Construction

Picture of Begin Construction

Now we begin to put it together

1. Add yellow rod pieces to a bottom plate
2. Add the motor

Step 4: First Layer

Picture of First Layer

This step requires 4 tan clips and 4 ball joints as well as a new type of plate, to hold everything in place. Construct all.

1. All parts
2. Pay careful attention to orientation of pieces
3. Top it all off

Step 5: Second Layer

Picture of Second Layer

You need four ball joints and 2 of the pieces you already made

1. Parts
2. Attached

Step 6: Third Layer

Picture of Third Layer

Much like the second layer, but goes the other way.

1. Parts
2. Assembled

Step 7: Keep It Together

Picture of Keep It Together

Add a few ball joints to hold it together.

1. Parts
2. Attached (like in the past steps make sure all the ball joints are turned the correct way)

Step 8: The Pin

Picture of The Pin

This is a really easy step. Don't mess up on this.

1. Red/tan rod with gear and tan clip (make sure your gear is a blue one with notches, otherwise cranking is a pain)
2. Insert from the bottom (disregard that odd side with the sticking out ball joint)
3. What it should look like now

Step 9: The Guts of the Grenade

Picture of The Guts of the Grenade

Begin adding the moving parts.

1. Add a yellow connector
2. Secure it with a tan clip
3. Add another blue gear
4. Secure it with a tan clip

Step 10: Topping It Off

Picture of Topping It Off

Find your other top plate and put it on. You are almost done.

1. Parts
2. Put the top on, and add the most important tan clip to the pin
3. Almost done, but still not strong enough to be a grenade

Step 11: Lock the Top On

Picture of Lock the Top On

Here we will lock the top of the grenade to the body of the grenade. It's more simple than it sounds.

1. Parts
2. Add 2 red connectors to the white rods shown, they are the ones with the thinner opening)
3. Do this to both sides
4. Attach them to the top

Step 12: Lock the Bottom Together

Picture of Lock the Bottom Together

Now we are securing the rest of the grenade together.

1. Parts
2. Do the same as the previous step, to the white rods with the smaller openings
3. Do to both sides
4. Attach

Step 13: Finished

Picture of Finished

You are done! Now all you need to do is crank the bottom of the grenade's pin (with gear) until desired length of time, then pull down so it locks in place on the top of the grenade. Load the middle of the grenade with "shrapnel" (green rods, tan clips, spacers, ball joints, ball joint connectors, or anything small, etc...). Toss grenade so it lands with the extended pin hitting the ground, which will unlock the grenade and it will "explode". Retrieve and Repeat, or build a few :P

Step 14: In Action

Picture of In Action

If you still can't figure out this simple system here is a picture walkthrough

1. Get your grenade
2. Turn the pin the opposite way the arrow goes on your spring motor
3. When you have cranked to the desired amount, pull down on the pin so the top tan clip locks into the white snowflake connector
4. Fill with "shrapnel"
5. Toss grenade so it lands with the pin(gear side) hitting the ground

Tan clip unlocks, motor engages and shrapnel goes flying everywhere. The last picture doesn't do it any justice, but you get the idea.

If you have any questions, you can message me and I will try my best to help you.


mberg (author)2010-06-23

see obluvitus'es fake grenade

mberg (author)2010-06-23

can you use something else instead of ball point connecters

mberg (author)mberg2010-06-23

nevermind. i thought it was for shrapnel.

dylan1234 (author)2010-02-27

 can i see a vid of if working?

Pizzapie500 (author)2010-01-18

3* The idea is good but it doesn't work well. (You should make this as a spinning top)

Pizzapie500 (author)2010-01-18

I'm guessing you're out of gray 1 connectors lolz

Pizzapie500 (author)2010-01-18

omg you have 2 mini motors! I have 105+ pounds of knex but only one mini motor!

covey12 (author)2009-06-17

you should glue the non moving pieces to make it permanent, and less fragile on impact

builder968 (author)2008-11-24

would buld, but dont have that weird spring motor.:(

flames10391 (author)builder9682008-11-24

:P its all good. they are pretty easy to find if you are that desperate to build it. otherwise you arent really missing out

builder968 (author)flames103912008-11-29

oh well. can you make another time bomb grenade like this without a spring motor. how 'bout one with springs or rubberbands instead?

flames10391 (author)builder9682008-11-30

i can try that. If i can find time i will

builder968 (author)flames103912008-11-30

thnks! tell me when youre done!

gamerboy0295 (author)2008-07-10

hey i have the same box! lol nice instructable anyway

flames10391 (author)gamerboy02952008-07-11

lol thanks

gamerboy0295 (author)flames103912008-07-14

no problemo

killer towels (author)2008-06-23

hahaha you got the name "anti-personnel" from the game red faction 2! you cant hide from me!!!

haha no actually i didnt i've never played that game and "anti-personnel" just means its a weapon used to kill things haha see: wikipedia

neardood (author)2008-05-29

it would help if ewe posted a you tupe video of the device in action

flames10391 (author)neardood2008-05-31

no camera i can afford at the moment could capture the speed of the shrapnel from the grenade but it's pretty simple how it works. 1.crank grenade and pull down on pin to lock 2.load shrapnel 3.throw hits ground, unlocks, shrapnel flies 5.lather, rinse, repeat

MI6 (author)2008-04-28

nice inventiveness

flames10391 (author)MI62008-04-28

haha thanks

Nice 1! :)

TheDunkis (author)2008-03-29

problem is with this thing as cool as it is it's not very practical to carry around with you. I'm trying to invent a real real grenade that can be lanched from an attachment that I'm adding to my latest gun. I could just as easily make a connector grenade but I want something to actually explode. This idea was pretty good though. Keep it up.

flames10391 (author)TheDunkis2008-03-30

ya this is only 1 of my grenades...i have many but this one was the easiest one to make an instructable. i also have an rpg launcher in the making

fobblewabble (author)2008-03-27

how do you get the ammo to stay in the grenade, everytime ive thrown it it falls out before the grenade lands :(

flames10391 (author)fobblewabble2008-03-27

good question, i had that problem before. This is one of the drawbacks of a grenade like this, but it can pretty much be made up for. what i originally did was put a few pieces of double sided tape on the bottom of the load area, but this limited the amount of shrapnel i could put in. Now, when i use it, i put a few ball joint connectors on the inside ball joints to kind of seal it off, but when it is set off, the pieces are flung out and move the ball joint connectors out of the way. This grenade has a few flaws and the second version works much better than this...I am still adding finishing touches to it. If you figure out a way to combat this, please tell me, I'd be interested to know.

I_am_Canadian (author)2008-03-26

Looks sweet! I wanna try this. how much stuff does it shoot? lots? great! Nice work

you can put alot of pieces inside but to many will make it jam thanks


ojochris (author)2008-03-26

"+" 1 Badass!

flames10391 (author)ojochris2008-03-26

haha thanks

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