Introduction: Knex Rocket

Picture of Knex Rocket

This is a Knex Rocket I built and it shoots about 30 feet up. Do not ask me to publish this instructable because I already took it apart. Please rate and comment. Credit for the Trigger goes to THE REAPER.


Oblivitus (author)2008-10-24

Doesn't it damage the pieces when fired up?

Yes it does. I still have not figured out that kink.

Try making the rocket denser and smoother around the edges, that will stabilize the structure and prevent fractures. Also try Duct tape on that red rod.

Speedmite (author)Oblivitus2009-04-29

Denser=Heavyer=less height.

Lauch it at an angle so it doesnt land on the stick.

Oblivitus (author)Speedmite2009-04-29

More mass can actually improve range depending on how much tension the design can hold.

Dashadower (author)Oblivitus2011-11-14

are u a rocket scientist?

Speedmite (author)Oblivitus2009-05-02

Its knex. Any thing that holds too much strain collapses something.

Oblivitus (author)Speedmite2009-05-04

True, but you did not refute my last comment.

Speedmite (author)Oblivitus2009-05-05

I did. I highlight the"depending on how much tension the design can hold." part. With this design, It seems that the light weight of the rocket thing is Ideal for launching. And I just did a science experiment on which projectiles went farther when shot from a potato cannon, and I weighed all the projectiles, and the lightest ones went the farthest.

Oblivitus (author)Speedmite2009-05-05


 Generally, if fired vertically, lighter always wins...

lighter = less mass, and less mass = more wind resistance. its why you can't throw a feather.

Thank you!

shieldsam (author)Oblivitus2010-12-18

its all about momentum. thats why you can throw say a 500g rock farther than a 200g rock .

vishalapr (author)2010-10-23


About This Instructable




Bio: I have moved on to better things...aka YouTube. So I will most likely not reply to any comments, sorry for any inconvienience. If you ... More »
More by Electroinnovation:Recycled Gatorade LED FlashlightThe (almost) COMPLETE Guide to Electric RC CarsT.N.K.I.T Round 1 Entry - Every Terrain Tank with Fully Automatic Turret
Add instructable to: