Introduction: K'nex Rocket W/ Launching Pad

Picture of K'nex Rocket  W/ Launching Pad

As i've said above this instructable will show you how to build a K'nex rocket I designed.

Please note:

This is my first instructable, so please no anti-K,nex comments

Step 1: Parts You Will Need

Here's a list of the parts you will need to build the ROCKET
(Parts may be swapped if the do not have an * by them)


1 black rod, the kind that is the same length as the grey ones *

1 Red rod*

8 green rods*

5 white rods*


1 red connector

5 yellow connectors*

14 Grey connectors*

2 blue sphere connectors *

3 orange connectors*

Step 2: Parts List Continued...

These are the parts needed to built the PAD


3 grey*

10 white*

2 red*

4 yellow*


1 red

10 yellow*

7 orange*


(optional) you may want to add a square piece as a blast plate

Step 3: Building the Rocket:barrel

Picture of Building the Rocket:barrel

First off we will build the rocket

to begin click seven of the grey pieces to one end of the red rod, then take an orange pieceand connect a white piece to it, add a green rod on the other end. after you have done this slide the orange connector onto the red piece by putting the end of the rod through the grey piece's hole.
after you have done that add two more grey pieces to the rod and add another orange connector as you would a green one. Add five more grey pieces and onther orange one and finnish it up with a yellow connector. what we've done is essentialy built a cannon the only thing you need to do is to make the firing pin, do this by adding the grey wedge piece to the end of the black rod.

Step 4: Building the Rocket: Fins and Tip

Picture of Building the Rocket: Fins and Tip

Okay after you have built the barrel of the rocket add a blue sphere to the end with the yellow piece.(do this in the center of the sphere so that you have all four sides facing out)On the other side of the barrel add a red connector so that the barrel comes to a point.

once this is done you can then build the fins.

first add a green rod to the bittom of the blue sphere, then add a blue sphere to the end of that in the same way as the first blue sphere.

then built and attach the fins (refer to pictures)

then add the grey pieces to the orange ones

Step 5: Building the Pad...

Picture of Building the Pad...

The next thing you need to build is the pad.

to build the pad you need to start by building the base.
to do so take two yellow connectors and one white rod, then snap the white rod into the top middle spot of the two yellow pieces.
this will be the base. next take an orange connector and put it on the white piece between the two yellow ones, make sure the orange piece is going up. then you put the grey rod on the orange piece, this will be the launch rail.

Step 6: Finnishing the Pad

Picture of Finnishing the Pad

now we can finnish the launch pad.

to make the supports for the pad snap a grey rod into the sides of each yellow piece and pull them out until they stop, pull each rod in a different direction. Then snap an orange piece in between the two yellow connectors and put a red rod on them. the on the end of one grey rod put 3 blue spacers and a red connecter. add another red rod to it and put 9 spacers on the rod. this will later become the guide rail.

now that you have completed the basic launch pad you can add a blast plate if you want. although it isnt neccesary for the rocke to function it helps a great deal

you just put the square piece on the long grey rod and slide it down all the way to the base, make sure you tilt the red rod up so it slides through the hole in the square.

another unnecesary but helpful thing is to add wieght towers. keep in mind Newtons third law of motion, for every action there is an equal and opposite reaction. to put it simply the rocket will push down on the pad at lift-off the more the pad wieghs the harder it will be for the rocket to move it so the rocket pushes off more easily.

anyhoo refer to the pics to make the towers and add tires to them.

Step 7: How to Add the Rubber Bands and How to Launch

Picture of How to Add the Rubber Bands and How to Launch

to add the rubber bands you first need to loop them into three pairs of two as shown

the put one end of the rubber band through the hole on the wedge, making sure that the wedge is facing away from the red connector.

attach the ends of the rubber banvd to THE "V" SHAPED PART OF THE YELLOW CONNECTOR BETWEEN THE FIRST AND SECOND SLOT. this is important becuase if you put the rubber bands anywhere else it will strian the black rod oddly and breack the ricket when you try to launch it. thread through the other two rubber bands and pull back the wedge until the orange piec blocks the rod from going through.

carefully put the rocket on the two rods making sure the grey pieces go on he guiding rod and the rocket itself on the launch rod.

to launch the rocket fkack the side of the orange switch with the yellow piece and MOVE YOUR HAND OUTTA TEH WAY!!!

if all goes well you should keep all your fingers and the rocket will fly up in the air.Yay!

Step 8: Things That Need Improving...

Picture of Things That Need Improving...

i thought of several things tha i needed to improve and i addressed as many as i could. however i was unable to resolve the following problems.

1. the return system(and the lack there of) i dont think this goes high enough to actually need one but if somebody else makes a better one this will probly be needed

2. i tried to put as much power in the rocket as i could but if you put two many rubber bands on it will break, is there any way to add more power without totally changing the design?

3. the square piece i used is kinda uncommon idk any other way to support it without using one, it will work without it but you have to reset after each launch and it gets annoying.

any mods/comments will be greatly apreciated(o yea and i know my spellings bad i was 2 lazy to go back a proof read lolz)


metalchopper (author)2011-04-14

VERY NICE.does it really work?

1sheridan (author)2010-09-25

add tape or wrap a rubber band around the gray connector

KingYaya (author)2010-06-01

I made a rocket that shoots and .5 Pound Knex rocket up in the air over 50 feet.
Also if you angle it....It can go up to 100 Feet far.

054629 (author)2009-04-09


ojochris (author)2007-10-13

Ps. What is the diff. between Black and Grey rods?

Wafflicious (author)ojochris2009-01-13

blacks stronger. greys is NOT FLEXIBLE its just not as hard

mettaurlover (author)Wafflicious2009-03-29

and white is even stronger than black.

jongscx (author)ojochris2007-11-09

black are rigid, grey are flexible...

ojochris (author)jongscx2007-11-09

Then What are the green-yellow and purple ones called?

jongscx (author)ojochris2007-11-09

...those are just color coded for different lengths...I think. I'm not too sure about the newer sets, I'm sure there are differences like that too...

mettaurlover (author)jongscx2009-03-29

no; they're color coded for how hard it is to bend them and how well they hold their shape after being released.

Wafflicious (author)ojochris2009-01-13


bomb voyajue (author)2009-01-18

/AWESOME 4 ur first instructable KEEP ON GOING LOL

dartman (author)2007-07-15

sgtmik i would love to see your version of my rocket 2 see the improvements you made.

DrWeird117 (author)dartman2008-09-10

Nice! Does it launch?

Gunnyzmith (author)2008-03-24

dude i made a k'nex rocket that was 4ft tall then i made it into a car lol

cardboarddude (author)2007-11-24

nice rug

ojochris (author)2007-10-13

awesome, but is there a way to make it without the big square grate thingy? I only have small squares and big triangles.

knexlord (author)2007-06-09

good desighn you could just make a square using round and corner peices

Colton (author)2007-02-20

I don't get how this works i mean its cool but complucated.

sgtmik (author)Colton2007-05-08

It's quite simple. The top rod (the one with the elastic) pushes the bottom rod, resulting the rocket to fly!

sgtmik (author)sgtmik2007-05-08

By the way, I've made my own based on yours and it flyies about 4 or 5 feet.

dartman (author)2007-03-16

i suppose i could make a smaller one but then i would also have 2 make a smaller ram that would use less rubber bands, thus less power. the reason you need 2 keep the ram the right length is becuase if its too long or has too many rubber bands it will disconnect and shoot out the back. however the wieght of the rocket would be reduced by alot so it might not need as much power but i havent gotten around to trying it yet so it might work

samando (author)2007-03-02

you could probably make a shorter version

dartman (author)2007-02-22

as for compicated if you think about it all this rocket really is is a cannon mounted backwards on the projectile. in fact if u take off the fins thats pretty much all it is. ok heres how it works, if you think of the rocket as the cannon and the pad as the projectile and fire the rocket/cannon the projectile is 2 heavy 2 shoot and is also going into the ground. since the pad cannot move the cannon has to and so it shoots into the air. idk if that helped any but there you go

dartman (author)2007-02-22

well if u look at earlier comments u would see that i could only get mine up three feet ten inches one of the things i was hopin 2 have someone do was think of a way 2 get it going higher, ideally ten to fifteen feet

quincy85wrestler (author)2007-02-21

how high did you get yours to go cuz i only got mine to go like 3 ft.

fobblewabble (author)2007-02-19

how far it fly up?

dartman (author)2007-02-18

cuz i was bored,outta rocket motors, and noticed the lack of any real knex rockets on this site...thats why lol

uvalacrosse (author)2007-02-18

y build a knex rocket when you can launch a real rocket?

dartman (author)2007-02-16

yea but wont it just tril the string behind it making unecesary drag? o yea hand how doues you pistol work?

Kaiven (author)2007-02-15

cool! knex is cool and stuff, but i havent found a good gun for me to invent yet. i did find how to make a silenced pistol :) oh, and if you tie a strin to the trigger, you can launch it from a distance, like the reak pyrotechno things.

dartman (author)2007-02-14

okay i went and measure and i goes three feet ten inches, which is about 4 feet. and apon reflection i think i know what faust means by his connector grid, did you mean make a square of white pieces and use as a blast plate?

dartman (author)2007-02-14

i think it goes about 4ft up but ill be right back im gonna go measure it

dartman (author)2007-02-14

hmmm i understand the wheel part, faust, yes it does sometimes land tail first but it isnt exactly "balanced" and will often land on its side. also what is a white connecor grid? just a bunch of white connectors hooked together?

sgt.peanut95 (author)2007-02-14

how hight does it fire

sona (author)2007-02-13

i hate all those people who critisize knex i mean it could use some improvement but i mod all my models anyway;D

hobo lord (author)sona2007-02-13

Yah i hate them to, because they are stupid and they don't know how to build knex, but I think one reason why they don't like knex is because there are too many 1 shot pistols on this sight!!

sona (author)sona2007-02-13

4got to say i like it :( sry

dartman (author)2007-02-12

thank you hobo lord, have you built it yet and if so do u have any improvements?

hobo lord (author)dartman2007-02-13

I haven't but I get how it works, and it seems to be a simple yet effective design.

de-evolution (author)2007-02-13

delete all your knex instructables because there a a waste of time and their all very kid just kidding that is so awsome

crestind (author)2007-02-13

Cool! It looks nice! 1. Have yet to build it, but I assume it falls tail-first. If you need a landing system, perhaps some wheels? 2. Thinking about it. 3. You could easily make a white connector grid.

oodalumps (author)2007-02-13

Pretty cool looking, when I first saw it I was like: W-w-whoa!

dartman (author)2007-02-13

lol same here im already tying to make the rocket carry a payload

dartman (author)2007-02-13

yea that was my plan, to biuld a not pyrotechnic rocket that could be used in city areas or indoors, it doesnt yet get the desired hieght but at least its a step in the right direction.

Whaleman (author)2007-02-13

pretty sweet, i like it cuz i cant use the normal rockets were i live, so its nice to have a useable rocket

hobo lord (author)2007-02-12

That is quite nice :) !!!

dartman (author)2007-02-12

Sorry some of my pics are pretty blurry i was having trouble with my camera(the auto focus rebelled against me...)

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