Introduction: The Sea Beast - a 12 Legged Walker

Picture of The Sea Beast - a 12 Legged Walker

This beast has 12 legs and is driven by a motor in the center. The legs walk the same as those from the "Strandbeest", made by the famous kinetic sculptor Theo Jansen.

Piece list for one pair of legs:
10 white
8 green
1 Blue

18 black hinge halves (These are a must!)
10 gray 1-way
10 gray 2-way
8 tan

2 blue spacers

note: In my own model I used black snap-on caps instead of tan connectors, you could use them as well if you have them.
note 2: This uses a lot of black hinge parts, you can buy these at knexusergroup if you live anywhere but in the US.


~ Kairah ~

Step 1: Making the Legs

Picture of Making the Legs

This step is for making one pair of legs. You will have to make this part 6 times.

So the legs are pretty tricky, lets start with making all the loose parts forone leg first.

Once you have made these you can put them together like shown in the next pictures.

Alright, then you have to make another one, and connect them together with a blue rod, two spacers and two gray connectors, and your'e done!

Step 2: The Axle

Picture of The Axle

Alright, this part that goes between the pairs of legs. Simple.

You could also use a gray connector instead of the black hinge I've used.

Step 3: The Frame - Part One

Picture of The Frame - Part One

 Make this two times.

Step 4: The Frame - Part Two

Picture of The Frame - Part Two

The motor can be any motor, but preferably this type (not the ones with a red batterypack). As for the axle, its a yellow size rod. Make sure to put the connectors at a 90degree angle!

Also at one side the green rod should pop out a bit, see picture 4.

Step 5: Connecting the Legs

Picture of Connecting the Legs

Now we have to lace 3 leg pairs together on two gray rods. Just follow the pictures, but make sure you don't miss any blue spacers.

In the fourth picture you have to shove the axle part onto the blue rod from the legs.

Make two of these

Step 6: The Head

Picture of The Head

 Right time to put the head together! :D

Step 7: Put Everything Together

Picture of Put Everything Together

 The last step is to put all the parts together. You might want to zoom in on the picture.

Step 8: You're Done!

Picture of You're Done!

Congratulations you're done! Say hi to the sea beast! ^^


sophiaruthmarie (author)2016-03-26

Can you provide the rpm details for the motor you used and make a piece list like you did for the legs for the other parts, ie the axle, the frame and the head? Trying to figure a total list of all the pieces I need to buy to make this.

GWorks (author)sophiaruthmarie2017-04-21

The green motor turns at 34 rpm :)
(other motor can be found here: )

Linkin_J_Knex (author)2015-09-19

Great idea!!

MrShadowKnight16 (author)2012-05-19

Epic! 5 stars

cool knex13 (author)2011-02-09

looks funny!

Kahsyrbag (author)2011-01-24

If only I had that motor, yours is 190rpm I got the black 22rpm motor.

interman (author)2010-12-20

I made it 5 stars! :)

aleceatsfood (author)2010-12-14

WOrks well (I haven't built it yet) but Just saying this thing would be a nice back massager! I cant see what are the peices on the legs that are on the white rods in the middle of the first picture?

Kairah (author)aleceatsfood2010-12-15

I think you mean > these <

aleceatsfood (author)Kairah2010-12-15

oh I have the hinges but not the caps too bad...

Kairah (author)aleceatsfood2010-12-15

You could use tan connectors instead and make only 4 pair of legs.
Just keep enough distance between the legs.

aleceatsfood (author)Kairah2010-12-16

how many hinges does 1 leg use?

Kairah (author)aleceatsfood2010-12-16

One leg uses 9 hinges, as you can see in the first picture :P

aleceatsfood (author)Kairah2010-12-19

oh i guess i was too lazy to look. And I only have like 4 hinges :P

michiel123456789 (author)2010-12-09

Very nice and compact! 5* But I've got a question, does it matter how long the axle is??? You used a yellow rod, can it also be a red rod (I'll have to 'cause my motor is pretty wide).

Kairah (author)michiel1234567892010-12-09

Cheers! If you are going to use a red rod, you will need to make some more distance between the first pair of legs and the motor. Otherwise the axle will stick between the legs and it cant walk! :)

michiel123456789 (author)Kairah2010-12-10

Ok thanx!

Fr-Pa-Co (author)2010-12-03

did you enter this into the kinetic sculptures contest

qwerty2008 (author)2010-09-18

i built one of these about a year back. i just saw how they worked then started building. i used this same structure just longer rods.

danbaha (author)2010-08-09

What is that song called?

Kairah (author)danbaha2010-08-09

jim noir - my patch

anres321 (author)2010-07-06

awesome !! 5*

rhysc7 (author)2010-05-16

whats up with the music

topcat123 (author)2010-05-08

 awesome and creepy

RESTRICTED (author)2010-05-07

 All i can say is this looks awesome! I built the strand beest done by crestind, but this looks a lot sturdier. I can't wait to build it!

Seleziona (author)2010-04-04


sprout_less (author)2010-02-15

 I'm amazing.Just kidding. Ok so I found away that you can not use all the black hinges. Look at the picture!

p.s. Sorry for the bad quality picture, i was using my web cam.

Kairah (author)sprout_less2010-02-15

If you put the black clip on in the other direction it turns slightly better.

sprout_less (author)Kairah2010-02-15

 correct! it doesn't work quiet as well but its better than not getting to build it.

Kairah (author)sprout_less2010-02-15

Do you mean like this? It fits, but doesn't turn very well unfortunately.

knexsuperbuilderfreak (author)2010-02-15

NICE WALKER! i might bulid later if i have enough hinges

Mr. Muggle (author)2010-02-15

I faved this! I only have 23 faves

travw (author)2010-02-14

I think I sh@t myself.

That is all.

Arbitror (author)2010-02-14

Now this is a cool k'nex project! It's good to see people thinking out of the box, that is the k'nex gun box...

TigerNod (author)2010-02-14

Just pure plain awesomeness, knex style. Great work, 5 stars!

Hiyadudez (author)2010-02-14


That thing is beast!

I'd build it, but I don't have that motor. Oh well.

5* and faved!

Kiteman (author)Hiyadudez2010-02-14

The original Strandbeest were wind-powered...

Hiyadudez (author)Kiteman2010-02-14

A breakthrough in technology!



Kiteman (author)Hiyadudez2010-02-14

Think of it as a challenge - you have no motor, but you do have enough K'NEX to build the mechanism.

Add sails.

Hiyadudez (author)Kiteman2010-02-14

Lol, it'd need to be pretty windy for that to work...

Blackpool beach... perfect...

Kiteman (author)Hiyadudez2010-02-14

Have a google - the originals were huge.

Kairah (author)Hiyadudez2010-02-14

 What motor's do you have then?

Hiyadudez (author)Kairah2010-02-14

The big silver trekker motor, the plug-in one, 2 battery pack ones and a pull-back (lol.)

Kairah (author)Hiyadudez2010-02-14

 Hmm yea, the battery pack motor might fit. But you'll need to modify the frame a bit.

Mr. Muggle (author)Kiteman2010-02-14


though you couldn't know that lol

Kairah (author)Hiyadudez2010-02-14

 haha the beast is beast :P

Shadowman39 (author)2010-02-14

Awesome! And congratulations on getting it featured! 5*

I_am_Canadian (author)2010-02-14

Very well made, great work.

Stephen D. Alverez (author)2010-02-14

Strandbeesten is the proper name. It translates into "sand beast" or  "beach beast" not sea beast. Still pretty narly.

Mr. Muggle (author)2010-02-14

oh, you build awesome stuff! it's pretty speedy too!
how is your huge ball machine coming along?
you must post pictures and a video here on instructables of that thing!

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