Introduction: Knex Rocket That Really Launches

This is a Knex rocket that actually launches using 4 large rubber bands. It is very simple and uses few pieces. It flies about 20 ft. Watch this video for proof. Please rate. Check out my new cannon.

Piece count (based on original colors)

Rods
white-8
yellow-12
red-28(n.b. mine are all green)
gray-10

Connectors
white snowflake-3
blue 3D-5
purple 3D-29
gray 1 slot-8
gray 2 slot-4

Other
4 large rubber bands

TOTAL-111

Step 1: Rocket

This is the projectile shot out of the base.

Step 2: Base

The Rocket shoots out of this.

Step 3: Adding the Rubber Bands

You place each of the rubber bands around the white peg at the top. Then you add the rocket. Finally you pull down the rocket on to the rod and release it. Watch this cool video to see the launch.

Comments

author
Knex4Life23 made it!(author)2013-01-22

i made it and it goes 60 feet in the air but i modified the structure

author
Airsoft+007+Sniper+ made it!(author)2010-10-24

you could make the design better good try i guess

author
Airsoft+007+Sniper+ made it!(author)2010-10-24

you should design a knex greanade

author
Airsoft+007+Sniper+ made it!(author)2010-10-24

thanks for the help

author
Ps2playa made it!(author)2010-02-15

i built this and i loved it so i thought i would improve it so i made a rocket three foot six and it didnt work but i made other big ones that were big and they worked

author
KnexFreek made it!(author)2010-01-23

 cool

author
something94 made it!(author)2009-08-07

could I possibly make it taller and tie rubberbands together to make it go higher? or would that make it collapse??

author
uguy made it!(author)2008-07-23

Isn't this just a vertical catapult?

author
Kiteman made it!(author)2008-07-24

Maybe so, but aren't most K'Nex "guns" really just catapults as well? (Nice-build, number-boy.)

author
Jesus. made it!(author)2009-05-23

yes but mostly just cannons and snipers are catapults just so you know

author
DrWeird117 made it!(author)2009-02-07

LOL

author
The+Jamalam made it!(author)2008-07-28

acctually, no they are not. they are crossbows to an extent. a catapult uses a slingshot mechanism or a swinging arm linked to a weight (trebuchet). Knex guns are crossbows, in that they use a blocker (trigger) to hold back a bolt which holds a projectile in front of it. when the trigger is pulled, the potential energy is released throwing the projectile forward.

author
Kiteman made it!(author)2008-07-29

Oh!

So the "block trigger" that certain K'NEXers moan about is simply something that blocks the movement of the projectile? I just learned something new about K'NEX...

However, true crossbow triggers retain the string, and the elastic PE in all bows (cross, long, compound and ballistae) is stored in the bending of the arms, nor the elasticity of the string (which is actually inelastic).

author
The+Jamalam made it!(author)2008-07-29

Yes - that is a block trigger, and that is true...

author
Electroinnovation made it!(author)2008-07-31

And the only true crossbow on this website is the one by Mepain called huge knex crossbow.

author
Lukes+mate1 made it!(author)2008-07-25

yes thay are so dont be so annoying uguy

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Skreetsha made it!(author)2008-08-25

did you know that you can put in the bischoff system so it can have a trigger :D

author
Jesus. made it!(author)2009-05-23

or you could put the mec from the brickster LDS or i_a_c 's heavy cannon mec on it

author
Electroinnovation made it!(author)2008-08-25

what is that? Could you post pics of it.

author
Trainman+2001 made it!(author)2008-07-23

built then turned it into a mortor 60FEET RANGE ON MINE!!!!!!!!

author
Speedmite made it!(author)2009-04-29

Build a potato cannon. Beast, Ok one go at least 200 ft with anything that fits down a barrel. All you do is tip it at a slight angle to get a mortar.

trajectory_sm.jpg
author
Speedmite made it!(author)2009-04-29

The pic goes Mortar gun hotwiser

author
Electroinnovation made it!(author)2008-07-27

Wow. Could you possibly post pics so I can make mine that good.

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Trainman+2001 made it!(author)2008-07-28

no im sorry ill get a pic though

author
DrWeird117 made it!(author)2009-02-07

Really cool.5*

author
Skreetsha made it!(author)2008-09-08

oooh sorry but this comment was just a tip :S

author
bannana+inventor made it!(author)2008-07-27

Very original idea!!! 4.5!!! :D

author
Lukes+mate1 made it!(author)2008-07-24

this rockes and its an easy build

author
panzerunit5 made it!(author)2008-07-22

lol i need to build it it looks realy cool on the vid. may be clearer on the instuctions but not bad

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