Blade firing K'nex knife

This instructable is on how to make a knife which can fire its blade. Useful when you are down to a knife when your opponent still has a gun, you can lull them into a false sense of security muahahaha! It can also fire small pellets.

I am not going to say 'it is my first instructable so be nice' because i hate it when people say that, so feel free to say so if it is rubbish. However, i do not want people saying bad things about k'nex in general.

Enjoy,

Knexguy

Step 1: Pieces needed:

8 yellow 5-way connectors
4 red 3-way connectors
1 ball socket connector
1 light grey two-way connector
2 hand connectors
8 white rods
9 green rods
1 yellow rod
2 bendy orange/red rods the length of yellow rods
2 elastic bands

all knex colours are in the metallic colours.

pic 2: you will also need these three pieces.

Comments

[NathanStrickland]

dude the knifegun is seriously EPIC! as for the super knex rifle thatguy was talking complete BS about, he is full of BS cuz my dads an engineer and he said that it would be impossible for a knex gun to do that without being reduced to rubble. any way im going to try and improve on this knife cuz i have too much time and nothin to do.

[XxsonicxX]

epic but i can't get fotos on

[XxsonicxX]

almost for got i will post photo soon

[XxsonicxX]

I just made it omg!

At first i could not fin the bendy pieces
Then i did not have the ball joint thing, but i did make a sub for it a pulple/grey one way connector.

[urtlesquirt]

Nice dude.I love blade warfare opposed to guns. they are just so much beter for killing zombies :)!

[verektemongul]

this thing is freakin awsome!!!!!!!!!!!!!

[OneTastyBurger]

hey guys try my knife
http://www.instructables.com/id/Knex-Ballistic-Knife-My-first-instructable/

[skyfaller]

I love this! I made 2 and made them into one. Knife shotgun anybody?

[explosiveknex]

awesome! just like in black ops. 5 stars!

[knexguy]

Thanks, when I posted this, I saw 3 years into the future and realised this weapon would become popular when Black Ops came out :D

[skyfaller]

That just made my day.

[flyerminer]

it's really called a ballistic knife.

[knexguy]

Hahaha, this made me laugh. I just love it when people play CoD and then think they know all the weaponary terminology on the planet.

[leeboy09]

yes it was ace

[knex_mepalm]

it's ok but still worthless against the knex rifle¹³¹⁰²⁹ which means to the power of 131029 normal rifles. I shot a bb through 2 bricks! I'm going to post it soon

[PKTraceur]

Umm...i'm not totally sure, but that's physically impossible. Knex is plastic. AR-15 is metal, and shoots lead at approximately 2800 fps. An AR-15 can barely if not at all, go through two bricks at 50'. Please, don't spam instructables with things like this. Post a video to show me, prove me wrong, that your knex rifle 131029 can go through two bricks. -PKT

[knexguy]

Erm... get off my Instructable spammer. Also, that is impossible. It will probably be in line with the other countless useless creations on this site... But go ahead, prove me wrong. I hope you do.

[knex_mepalm]

It uses an engine though anyway I'm sorry I spammed I was reckless then but now I'm working on a slightly stronger one with better grip cause the recoil hurts a lot. it's not useless it's "different"

[knexguy]

Engine? And recoil is pretty much impossible for a K'nex gun.

[knex_mepalm]

" PRETTY MUCH IMPOSSIBLE." Beacause of the extreme force hitting the bullet there will be energy waves shifting the environment making it have recoil. *UPDATE* I found out it's not recoil, its just the rod flying back and hitting on my arm when I forgot to install the safety. Sorry 'bout that. AND PKTRAUCER, I will post video but im testing it 100 times to make sure that It can shoot like that

[mankros_dakren]

 Um, I'm 100% sure that the power of 131,029 rifles is enough to reduce ANY K'Nex creation to a pile of broken plastic, but please, by all means, continue to tell us about it. We need to know EXACT details for when K'Nex become illegal for children and felons to own because of their potential as a firearm.

[knex_mepalm]

 The rifle bit has 45 rubberbands attached to a rotating motor which spins the bullet at incredibly high speeds. The fornt of the knex gun is roughly 11 pieces thick and sort of airproof, then another bit at the back is 7 pieces thick and still air proof is pimping 150 fps of air through the gun, at the end is the bullet. The bullet is 14 melted bbs together and then with a wire sticking  into it making it constantly molten, when shot the bb, goes whizzing through the air at 450 kph and at 950 degrees C and wham into the brick. The end. The front of the gun breaks off every time is test it.

[mankros_dakren]

 #1:fps measures SPEED, not air pressure.
#2:If the bb's were "constantly molten", they would flow(because molten metal, being a LIQUID flows.)through the gun, melting it to unusable plastic chunks.
If you still stand by your words, it  won't bother me.

[BlondGuy101]

I greatly look forward to that

[m1n1j1mmy]

ive seen better... but its still pretty damn cool a knex knife that shoots its own blade :-D

[knexguy]

And how many of the 'better' ones were posted before this?

[knexguy]

Well, this is 1 and a half years old.

[TwistedParadox]

I was watching the Punisher a few days ago and I was trying to find a fblade which could be fired. w00t for this!

[knexguy]

:)

[leeboy09]

yeah its realy AWSOME!!! your a knex master

[knexguy]

Thanks!

[leeboy09]

i think this is awsome your real good ive never built an instructable lol

[knexguy]

Thanks, have you built it?

[stevoIution]

KNIFE
–noun
1. an instrument for cutting, consisting essentially of a thin, sharp-edged, metal blade fitted with a handle.

[knexguy]

Wow. Half of the stuff on Instructables isn't what it says. None of the knex guns, for a start.

[pindalanderz]

darn. I thought it was a real knife gun.

[knexguy]

Easily moddable. Just stick a stanley knife blade (or 4!) in on top of the 3 slot connector.

[Shadowfuryix]

i love this knifegun, awesome job. i thought that your blade was kind of small and would make your enemies suspicious, so i made a new one and now mine looks like a meat cleaver :) it dosen't fire as far, but it looks like a real knife. also, the problem of the stress on the side panel making it break occasionally can be fixed by placing a white/silver rod in the hole. it wont fall out because the rubber band pushing on it will hold it in place. and also, i think the pellet works better with a blue rod instead.

[Shadowfuryix]

the cleaver:

[knexguy]

Lol, Looks fun. Can't imagine that it fires that well though?