Introduction: K'NEX Rocket Launcher

Picture of K'NEX Rocket Launcher

This is my newly built K'NEX rocket launcher- named the Lyfebreaker. It is powered by a notebook spring.

Step 1: Firing Mechanism

Picture of Firing Mechanism

These pictures show the launcher primed and loaded, and not primed or loaded.

Step 2: Sights

Picture of Sights

...And these are the sights.

Step 3: Back Support/ Rear Flare

Picture of Back Support/ Rear Flare

This is the back support and the opening the imaginary "back-blast" would come out of.

Step 4: Ammo- Rocket

Picture of Ammo- Rocket

This is the kind of rocket it shoots.

Step 5: My M72LAW Replica

Picture of My M72LAW Replica

This is my other rocket launcher. It's obviously not K'nex... It shoots water bottle rockets. It is exactly to scale and weight of the real thing. I built it last summer.

Step 6: Thanks for Viewing!

Thanks for looking! I post ibles on request!


The Knexer (author)2013-08-13

I belive: 1 try to figure out a better spring/ power souce/ better way to use the spring, and 2 to shrink it because of the mechs size.

JonnyBGood (author)2013-05-21

Nice rocket launcher! What range does a notebook spring give it? Did the rocket make the dent in you background of your picture on step 4.

nerfrocketeer (author)JonnyBGood2013-05-22

Thanks! It's a long story... First the notebook spring worked ok... But then it got weaker. Therefore I disobeyed the number one rule of springs and stretched it which made it really powerful temporarily (and thus the dent). Then it got really weak again... The weak ranges were only five to ten feet... The strong ranges were 15-25 feet- which is.enough to dent my already weak posterboard background/target. Overall, its not the best launcher, but its ok...

JonnyBGood (author)nerfrocketeer2013-05-23

Alright cool. I have a few offbrand nerfgun springs laying around waiting to be incorporated into a knexgun. Your rocket launcher shows the potential is there.

nerfrocketeer (author)JonnyBGood2013-05-31

Ok! Good luck with yours! My inspiration came from the power streak rocket launcher in my Rocket Mods Instructible. It works using a very simple release system-the trigger holds the ROCKET in place, and there is no plunger or firing pin.

JonnyBGood (author)nerfrocketeer2013-06-03


sandroknexmaster (author)2013-05-22



About This Instructable




Bio: Hello! I'm Nerfrocketeer, also known as Nefrock', Nerf, or NK. I am an avid fan of Nerf wars, engineering, and animal activism (but no ... More »
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