theo jansen mechanism

OK, I finally got hold of measurements for theo's strandbeest. these come directly from theo himself which means there accurate however it also means they're not in English. the numbers are there and they're easy to figure out, but it would be nice to know what the paragraph beside them says. so if any can read it, please post a translation. thanks

Picture of theo jansen mechanism
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gedion40005 years ago
this should be a better drawing of the leg. hope you can all read them better.
McMech6 years ago
Sorry, I know this is an old post but I need to ask. If I were to use these dimensions for a science fair project (Comparing legged to wheeled robots) would I need Theo Jansen's permission?
Kiteman McMech6 years ago
No - they've spread so far around the net, they are basically common knowledge. It would, however, be appropriate to credit him, maybe include a link to his work.
McMech Kiteman6 years ago
Thanks, that's what I thought but I didn't want to risk it. I'll make sure to specifically call it a 'Theo Jansen Mechanism'
The following is a direct translation from a 20 year old Belgian who speaks dutch as his mother language (it's me btw ;) ). I kept the translation so directly translated as possible while staying in the context of the text. Hope you enjoy any questions don't feel afraid to ask

Then he would have been busy with that for 100000 years. That much time was not available, therefore he took refuge in the evolutionmethod.

In the computer 1500 legs were created with poles of lengths that were random. The computer looked which legs where close to the perfect walking curve. From those 1500, one hunderd of the best lengths were slected. They got the honor to reproduce themselfs (translation note: evolution so he means "sex to reproduce". There poles where copied and combined to 1500 new legs. These 1500 legs showed a resemblence to there parents and where tested for their comparison to the perfect walking curve. This proces repeated itself for many generations and the computer stayed on for many weeks, months (day and night).
Finally 13 numbers came out, the ones who gave the ideal lengths for the nessecairy poles. The end result was the leg of the Animaris Currens Vulgaris. It was the first walking beachmonster (translation note: beachmonster is the english translation of strandbeest). Yet the Vulgaris resisted heavily against walking. A new computerevolution deliverd the legs of the generations that followed.
Here are the magic numbers: a= 38, b=41,5, c=39,3.... (I didn't want to copy these further)
this diagram is on his strandbeest website.
Groxx7 years ago
 Holy cow, a million thanks for the numbers!  I've never seen them online before, and I've got a project I want to do with these legs...

I was debating just evolving my own set of numbers, but Jansen's own are known to work, and already done for me :)  I'd never be able to figure this level of detail out of pictures of his beasts, and coming up with the algorithm to evolve them would've been a real pain (and would put me over my time limit for this project).
mmm18 years ago
Does anyone know the diameter of the circle around which the axel rotates, moving the leg? and are these numbers metric or foot/inches?
Kiteman mmm18 years ago
the metric/imperial question doesn't matter - what's important is the ratio of the various numbers.
budsiskos (author)  mmm18 years ago
i would assume they were in centimeters and the radius of the circle is 15
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