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Joules, the electric stoker

Concept, Electric bike 9 182

I talked a bit about electric bikes in my last post, so today I will share a different take on that subject. Meet Joules, the stoker on Carl’s home built electric tandem. Carl challenged himself by asking, “Could I build an electric tandem based on actually pumping the pedals?” The result is a design that is indirectly driven by a PMG-132 electric motor through a linkage that simulates the motion of human legs pedaling. Carl points out on the Endless-sphere E- bike forum that:

“The fun part was coming up with a drive linkage that would use human-proportional legs to pedal in a circle matching the pedal cranks. The linkage delivers force tangent to the crank circle through the whole pedal revolution.”

I think this really is an interesting project and an impressive build by Carl. See the additional photos on his forum post and be sure to check out his video of Joules in action. Now if he could only get Joules to carry on a conversation, he would make a great robotic tandem partner.

Since this post is about an interesting and unusual creation, I will direct you to one other. The Hopworksfiets, as this Bike Portland post points out, is a “party bike complete with wood bar, kegs on tap, pizza rack, sound system, and mountains of mojo.” Looks like fun…and it is probably no surprise that it was made in Portland.

One last link while I am posting; BikeRadar has an interview with Specialized design director Robert Egger that is definitely worth checking out. It’s a great interview with a pretty interesting guy. For more about Egger, click through to to the Specialized podcast interviews with him from a few years ago.

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  1. B. Nicholson September 17, 2009 at 1:52 am -  Reply

    Joules, very funny! A motor mounted atop the seat tube like a saddle with pistons connected where the pedals screw in might be doable, though.

  2. Human_Amp September 17, 2009 at 10:20 am -  Reply

    err I guess that should be 'Bobby Root' – Freudian slip 🙂

  3. Yokota Fritz September 17, 2009 at 5:53 pm -  Reply

    That's pretty cool. Wow.

  4. home staging in Toronto October 10, 2009 at 3:14 pm -  Reply

    Hi! As a professional dealing with design and fashion I'm always interested in anything new and I think that the bike is really funny. However, I really appreciate the level of creativity!
    Take care,

  5. Alex Espia December 11, 2009 at 2:35 am -  Reply

    Looks like Joules in enjoying his ride! Now that it is brought to my attention – may I ask why "robots" have to given a male name?! Anyway, Joules name is really "electrifying"!

  6. Madison December 20, 2009 at 9:19 pm -  Reply

    Interesting! Joules, bike and electricity? I can see the pattern fairly well!

  7. Kevin at Utah eBikes April 2, 2010 at 5:17 pm -  Reply

    Ha! Very clever. I would imagine Joules will be developing quite a local following. He needs one more motion–an occasional wave of one of his arms.

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