Introduction: Pineapplebobthegreat's Knex Cyber Bow

Picture of Pineapplebobthegreat's Knex Cyber Bow

Click on the step 8 to see how this bow is nearly indestructible from rubberband force.

This is a knex bow that I made that looks very futuristic. It uses a lot of pieces and is pretty big for a bow. It measures over 2 1/2 feet tall. The grip is very comfortable, but I made it to fit my hands. You may need to change the grip around if your hand is bigger. If it's smaller, it won't make much of a difference.

Also, this bow was made for right handers, so if you're left hand, all you have to do is turn it around and hold it the opposite way. IF you are right handed, the way to hold this bow is have the yellow connector slots sticking towards your right hand and hold it with your left hand. I'll show a picture of how to hold it.

BTW, this is my first knex weapon that isn't a gun. It's very sturdy and can hold a lot of pressure. I do not know how powerful it is right now, but I'm pretty sure it will at least be able to shoot 15 - 20 feet. I'll make an arrow step after I have found a rubberband big enough to fit with the bow.

I am canadian, what rubberbands did you use for your cannon? Those look very stretchy.

Finally, a part list. I make a part list for most of my creations so that the builder doesn't find out that he/she doesn't have enough pieces on the second to last step. lol.


RED: 8
GREEN: 24~
Bendy rods: 6


RED: 72
GREY 1-SLOT: 104

TOTAL: 387

*The first picture is of the new edition. The second is of the old edition.

Step 1: The Limbs: the Bottom Half

Picture of The Limbs: the Bottom Half

We will be making the limbs. The limbs are sturdy and can hold a lot of pressure. It will be broken into two steps: The Bottom Half and The Top Half.

1: This is the finished product. We will be making two of these.
2: This is the bottom half of the limb. Make two of these.
3: The bottom half of the limb again. This time, you're looking at the underside.

Step 2: The Limbs: the Top Half & Connection

Picture of The Limbs: the Top Half & Connection

This is the top half of the limbs that we will be making.

1: This is the top half of the limb. The wheel turns to reduce the bending in the limbs and keeping them from breaking. Make two of these.
2: This is the underside of the limb. In this picture, the way the wheel is set up, the wheel will not turn. Instead, make the orange connectors going straight out instead of slanted upwards.
3: In case you were having trouble, this is how the wheel connects. Once again, put the orange connectors facing out instead of slanted upwards.
4: Get the top half and the bottom half of one of the limbs. It is easier to connect while looking at the underside.
5: Connect. Do steps 4 and 5 again with the other two pieces.

Step 3: The Limb and Handle Dividers

Picture of The Limb and Handle Dividers

Here are two bars that divide the handle from the limbs.

1: Make two of these.
2: The underside.

Step 4: The Handle

Picture of The Handle

The handle was designed to fit my hand. You may need to modify it slightly to fit yours.

1: The handle complete. Ignore the stuff in the background.
2: The handle complete (cont.) Ignore the junk in the background (and my hand lol). The two light grey connectors that you see were not supposed to be there.
3: Make two of these.
4: Step 3 (cont.)
5: Step 3 and 4 (cont.)
6: A support rod.
7: The grip area. It doesn't look very comfortable, but it actually is.
8: Connect.
9: Connect (cont.)
10: Connect the support rod.

Step 5: The Two Main Support Bars

Picture of The Two Main Support Bars

These are the two main support bars. You may need to stretch the rod a little to connect, but it keeps it very sturdy.

1: The two main support bars. (OMG, my knee!)
2: zoom in
3: zoom in (again). Make note that at the end of one connector, there are three reds, while there are only 2 red connectors and a blue spacer on the other end.
4: Showing the blue spacer that i just talked about.

Step 6: Connection! WHOO!

Picture of Connection! WHOO!

1: Connect one of the dividers to the bottom half of one of the limbs. The two red rods that come out of the divider go half way in between the two yellow connectors so that it is even.
2: Connect the handle to the divider.
3: Step 2 (cont.)
4: Connect the divider and the second limb to the other side of the handle.
5: Connect the main rods to bow.
6: Step 5 (cont.) You want to connect the red connectors here.
7: This is how you connect.
8: zoom out. (OMG, Nerf gun and some yarn!)

Step 7: Mods 1: Strength

Picture of Mods 1: Strength

These mods are very important! This mod provides strength.

1: Attach a bendy rod to a yellow connector.
2: Attach it to the limb like so. Do it to the other side of the limb. Then repeat this step on the second limb.
3: Get this bendy rod. It does not have to be a different color.
4: attach it here....
5: ... and here. Do not repeat on the other side. Do repeat on the second limb.
6: Get this piece. Make two.
7: Connect here...
8: ... and here. Repeat on the opposite direction.

Step 8: Mod 2: Protection

Picture of Mod 2: Protection

I first want to say that this has never been done before in the history of knex bows or crossbows. This is a limb modifier that tilts upwards when you've pulled back the rubberband and tilts downwards when the rubberband is in place. It prevents any stress on the limb, therefore making the limb nearly indestructible.

1: First, change the wheel part so that it looks like this. Everything should be straight.
2: Normal.
3: Tilted up.

Step 9: How to Hold the Bow

Picture of How to Hold the Bow

1: A picture on the right way to hold it.


bboy321321 (author)2013-03-05

this bow is one of the best bows i ever seen on this website

DJ Radio (author)2008-11-15

Nice bow, I made one that doesnt use knex pulley wheels (because i dont have any, lol), what do you think?

uri172 (author)DJ Radio2009-12-07

Nice! can you upload a video that shows how to build it?

DJ Radio (author)uri1722009-12-07

No.  Next time look at the post dates before you ask dumb questions like this.

Mr. Dudeness (author)2009-02-15

This bow looks promising, it looks like it can hold up and it looks cool period. However even when I started putting the pieces together, I could tell that it was going to be very flimsy and practically suck. I finished putting the strengtheners on and it helped big time, but still i shake it and things snap and get dislocated. The limbs can't even hold the weight of the rest of the bow so i don't understand the can hold a lot of pressure part. However, good job for trying, I realize it is hard to make a sufficiently working bow out of k'nex and this bow looks cool otherwise.

arrow shot (author)2008-10-15

Done building it, broke instantly when i put 5 rubber bands tied together on it, and it was actually sort of loose, not tight at all, and it broke...

rlly? Hm.. did you attach the bendy rods?

indeed I did. I think i might get a picture to you soon...let me try to get 1

arrow shot (author)arrow shot2008-10-17

K here


arrow shot (author)arrow shot2008-10-17

ugh, forget, the 2 blue circles are the peices that come off of the yellow rod. The yellow rod is signified by a red circle. Always breaks here

apples!!!!! (author)2008-10-11

I'll probably make it when I finish and post the steyr.

Oompa-Loompa (author)2008-10-10

Like it better without bendy rods.

In the pic, it doesn't look to good, but it does normally. The bendy rods are nescessary to keep it from breaking

Crap, cause I got none....

arrow shot (author)2008-10-11

when i said last question...i lied....where do i shoot the arrow from?/through? and will the arrow be knex?

You shoot right above the top orange connector that is horizontal between the handle and the handle devider. However, don't let the bow hit the orange connector or the divider. The arrow would go on the left side. would go on the left side.

wouldnt it make it easier to replace the red connectors on the support bar with silver spacers so that the orange peice could rub against it without too much friction?

That would be true, but I don't have a lot of spacers. Yeah, yuou could do that.

arrow shot (author)arrow shot2008-10-11

the limbs broke off when i put a rubberband on it... i thought it was supposed to stay even when you pull it back? as soon as i started to pull back the limbs seperated form the bow.

You may have been using too small of a rubberband(s). You will need 4 medium (M) rubberbands, 2 small(s) rubberbands, and 1 Large (L) rubberband. The large rubberband can stretch about half the lenghth between the two limbs. The order they go in is: S, M, M, L, M, M, S Tie them together like this and put the two small rubberbands round the two wheels.

arrow shot (author)2008-10-10

last question(s) for the handle, can i substitute all grey 1 slots with grey 2slots? and, do i need the red support bar thingies otherwise i would have to go out and buy more knex, and i dont think i need that many more peices, jsut a couple

As for the handle, sure, but it might not feel as good. All of the support bars are nescessary or the bow will fall apart. If you do not have enough red connectors for the four support bars, any other connector will work except for white.

ok thanks, i should finish the bow by today :D

arrow shot (author)2008-10-10

im not sure i have 104 grey 1slots... now i cant make the bow :**(

lol. Most of the grey 1 slots can be substituted for blue spacers.

:D maybe want to tell me which ones are most important to have, so far ive completed the...limbs, which i cant seem to connect, and the 2 bar things in step 3. i dont have enough for the handle, so i can just replace? also i posted a question on the limbs section

The greys in the middle of the limbs can be substituted. It's hard to connect, but after a lot of pushing, it snaps together.

I_am_Canadian (author)2008-10-10

I am canadian, what rubberbands did you use for your cannon? Those look very stretchy.

They are #64 elastics strung together. IF you go the the bow step in my cannons I show you how to tie them up.


AWESOME! THis is a great Bow. Im going to work on one. The shape looks great. Nice to see you back about.

5 stars.

alfpwns (author)I_am_Canadian2008-10-10

BOW TIE!!!!!!!!!!! ☺ ►•◄ /\

I_am_Canadian (author)alfpwns2008-10-10


alfpwns (author)I_am_Canadian2008-10-10


arrow shot (author)2008-10-10


cant wait to build, why did you change it?

Mostly for strength. I was afraid that with too much rubber band force, the bow would snap.

alfpwns (author)arrow shot2008-10-10

how you do that heart?

arrow shot (author)alfpwns2008-10-10

on a dell, hold alt, make sure num lock is on, press 3 on the key PAD (not the row of numbers above the letters, the numbers to the RIGHT of the arrow keys) then let go of alt tons of different hings you can do, for example, alt, 7, alt,makes a dot •

alfpwns (author)arrow shot2008-10-10

☺☻♥♦♣♠•◘○ 1- 10 ♂♀♪♫☼►◄↕‼¶11-20

arrow shot (author)2008-10-10

are the wheels suppposed the have friction? yes i did put the orange peices facing directly away from the main body.

alfpwns (author)2008-10-10


Oompa-Loompa (author)2008-10-10

coolest bow on the site 4 stars.

the_burrito_master (author)2008-10-10

Nice! its actually got shaping! Good job!

Der Bradly (author)2008-10-09

First comment and 5* rating
this bow is good, i mean fantastic

About This Instructable




Bio: none, absolutely none
More by PineapplebobTheGreat:Pineapplebobthegreat's Semi-Auto Halo Assault RifleMaple Story Nocturne Wizard StaffPineapplebobthegreat's Knex Cyber Bow
Add instructable to: