[25x30x40 cm, 165 parts, about 90Mb]
The Mechanism. WAP is a paper automaton whose main mechanism is Redtenbacher`s variation of the Cartwright straight-line mechanism, a twin gear driving a common slider crank. If the two gears have different but almost equal number of teeth, the up and down motion of the bar is then an addition and subtraction of two sinusoidal functions. The straight line generation, determined by the vertical motion of the bar, was a very important problem in the early history of mechanics. In WAP, the “random” motion of the unlucky airplane is generated at the center of the beam, that is free to spin. At that point, the two sinusoidal movements originate the oscillation that, together with the up and down motion of the bar, results in the air-pocket-like shaking up.
(further information at http://kmoddl.library.cornell.edu/index.php)
Cartwright mechanism
Redtenbacher’s variation
The main mechanism in WAP is based on two gears with ratio equal to 1.2 (18/15 teeth). The entire cycle is completed after five turns of the handle.
Ferdinand Redtenbacher (1809-1863). The transformation of mechanical technology from a mainly workshop-based profession into an engineering science, particularly in the area of design of machines and mechanisms, is closely related with the name of Ferdinand Redtenbacher. He was of eminent historical importance for 
the evolution of mechanical engineering to a technical science in the nineteenth century. Redtenbacher’s role as the originator of mechanical engineering as a science in Germany is fundamental and of general interest since the introduction of science into engineering is a “sine qua none” for the development of a powerful high tech industry. As a professor and the director of the Polytechnic School in Karlsruhe, Germany – today the University of Karlsruhe (TH) –, Redtenbacher’s influence therefore helped establish the German manufacturing systems engineering even today. (from Wauer, J., Mauersberger, K., Moon, F. C., 2010. Ferdinand Jakob Redtenbacher (1809–1863), in Distinguished Figures in Mechanism and Machine Science, History of Mechanism and Machine Science, Ceccarelli, M. Ed., Springer Netherlands).
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Great model and video! Thank you!
Wow, it’s really amazing. Your most sophisticated model since “Wandring in the sky”. Tank you very much Pino.
Awesome. Thank you very much for sharing it. i have already done some of your automatas. i will have a lot of pleasure making this one.
A fantastic model and realistic video. I’m looking forward to the build. Very interesting is the inclusion of the variation of the Cartwright mechnism. Thank you Pino for the elaborately designed model with free download.
Michael
I have to make it, but where are the instructions.
I have to make it, just love the movement.
Unpack and open the instructions file.
Ciao!
Great model I am building it but I am slow(careful)just one question
several times you say print the back,what does that mean.Any help appreciated
Hi Michael!
Just print the back of that page. Some parts are colored on their back, too.
I mean, the page after the one where it is written “print back” is the back of that page.
Clear? I hope so…
Ciao!
Brilliant,got it.Thanks for your reply.
regards
michael
This is the first time I’ve made your models, it is fantastic, thank you very much for sharing it.
Awesome model! Thanks you very much to sharing it.
May I translate instruction to Vietnamese (my native language) and repack it in to new PDF file to sharing it in our fanpages 🙂
Thank you Nghia Zer for your appreciation!
Yes, of course, you can translate and repack the project. Please, when ready, send it to me the pdf file (it will be the first time I see one of my model in Vietnamese version… 😉
Hi,I have finished wap it looks great.I had some problems,mine not
yours,the sun ended up on the opposite side(oops).All in all a great fun build thanks
Hi Mr. Paperpino.
I’ve only just started in the world of papercaft and have been fascinated with his designs, is a real inspiration to me.
Maybe one day not too distant to make my own model
Thanks for sharing your talents.
Grettins from Mexico city
I’m making it !
So amazing , so hard but i love it
Thank you very much ^^ ………
Nice! Now I have WAP sitting on the shelf next to WITS! Thanks for the very nice models!
I love this model! The range of movements is amazing, and the colors and details are really well done. I am looking forward to building this. thank you very much for making this available.
I built the WAP and it was very enjoyable. Your part fit is perfect which makes the building fun and the result satisfying. The way you have designed each part is quite amazing. The assemblies that I thought might go together with some dificulty are easy because of the methods you used in creating them. It is a fantastic piece. Thank you.
Chris Knowlton
A4 sized paper is kind of hard to find over here in the U.S.. Will I run into gears not meshing correctly if I scale down to 8.5 x 11″ I’ve done a couple of your other projects but none of them had gears like this. I suppose I could just give it a go, but ink is expensive.
Your thoughts would be appreciated
P.s. I think it scales down just under 95% if I remember correctly
Hi Aaron.
I am not sure to understand your problem correctly.
When you resize, you should not adapt to letter page, but you must resize to a percentage of the original. I think 95% could be fine.
Ciao,
PINO
thank you very much for this free model n.n Greetings from Argentina!
I am downscaling it to 25%! I only made the air pockets generator(it is so hard to make this in 25% scale). I will finish it in to two days.
Good luck!
😉
Absolutely beautiful automata!
Just one question: how can I open a rar document?
Hi Christine!
To opern .rar files there are several free softwares. Try with 7-zip (http://www.7-zip.org/).
Thanks for your appreciation.
Ciao!
I love this creation very much. I really would like to make it for fun. Thanks for your sharing.