WAP – WARNING! Air Pockets

Posted on October 26, 2013 by paperpino

WAP-Cover2

[25x30x40 cm, 165 parts, about 90Mb]

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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-350

Cartwright mechanism

Redtenbacher's variation

Redtenbacher’s variation

mechanics

 

 

 

 

 

 

 

 

 

 

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 Porträtthe 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).

wap-300

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27 Responses to WAP – WARNING! Air Pockets

  1. Dan says:
    October 26, 2013 at 23:27

    Great model and video! Thank you!

    Reply
  2. maxlrainer says:
    October 27, 2013 at 11:02

    Wow, it’s really amazing. Your most sophisticated model since “Wandring in the sky”. Tank you very much Pino.

    Reply
  3. Pascal says:
    October 28, 2013 at 10:19

    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.

    Reply
  4. michael42er says:
    October 28, 2013 at 16:13

    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

    Reply
  5. David says:
    October 29, 2013 at 00:16

    I have to make it, but where are the instructions.

    Reply
  6. michael says:
    November 13, 2013 at 05:27

    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

    Reply
    • paperpino says:
      November 13, 2013 at 09:12

      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!

      Reply
  7. My Essay Point says:
    November 22, 2013 at 18:45

    This is the first time I’ve made your models, it is fantastic, thank you very much for sharing it.

    Reply
  8. Nghia Zer says:
    December 10, 2013 at 17:12

    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 🙂

    Reply
    • paperpino says:
      December 10, 2013 at 18:35

      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… 😉

      Reply
  9. michael says:
    December 14, 2013 at 00:55

    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

    Reply
  10. Rodrigo García says:
    December 24, 2013 at 21:03

    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

    Reply
  11. benhu261hcm says:
    March 1, 2014 at 16:57

    I’m making it !
    So amazing , so hard but i love it
    Thank you very much ^^ ………

    Reply
  12. Tim Davis says:
    March 4, 2014 at 22:13

    Nice! Now I have WAP sitting on the shelf next to WITS! Thanks for the very nice models!

    Reply
  13. Mike Parker says:
    April 30, 2014 at 18:05

    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.

    Reply
  14. Chris Knowlton says:
    October 24, 2014 at 20:20

    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

    Reply
  15. Aaron says:
    January 31, 2015 at 02:47

    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

    Reply
    • paperpino says:
      February 15, 2015 at 23:32

      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

      Reply
  16. lu laviu says:
    February 25, 2015 at 19:09

    thank you very much for this free model n.n Greetings from Argentina!

    Reply
  17. Aryan says:
    October 10, 2015 at 17:19

    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.

    Reply
  18. Christine says:
    November 7, 2015 at 18:55

    Absolutely beautiful automata!

    Just one question: how can I open a rar document?

    Reply
  19. Dragon Lin says:
    August 15, 2017 at 16:30

    I love this creation very much. I really would like to make it for fun. Thanks for your sharing.

    Reply

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