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Shawn Raymond's Tandem Bike is Shorter Than Yours (Video)
This isn't a "both peddlers are equal" bike. The person sitting in the rear seat is in the "control" position. Because of the wide handlebars, he or she can reach around the person in the front seat to steer. The person in the front seat can't really do much except enjoy the ride, or maybe lean back and whisper a sweet nothing or two if the person in the back seat is someone the front-seater loves. The bike is called the UnaTandem (turn music off in the lower left corner of the page), and Shawn Raymond tried to get Kickstarter funding for it back in 2012 but only raised $1651, which was quite a ways short of his $70,000 goal. So, with Kickstarter in the rear view mirror, Shawn is trying to do his own crowdfunding. Will this work? Can he get enough people to buy into his idea of a tandem bike that gives you the old "riding on the handlebars" feeling to get his company off the ground? Can he use his own money (assuming he has enough) to build and sell his tandem bikes without bringing in outside investors at all? And then there's the price problem. Shawn says he's looking at a retail price in the $850 range. That may not seem like a lot to some, but you can buy 10 Walmart bikes for that much. Or four or five bikes from specialty bicycle or sporting goods stores. Despite the high price, some will undoubtedly buy these short tandem bikes and like them. But will enough people buy enough of them to make this a viable business? Shawn obviously thinks so. (Alternate Video Link)
It is very presumptuous to claim one has invented a "new" bicycle just by rehashing normal parts. Millions of amateur inventors in every country in the world have been doing the same thing for 100+ years. Fans of vintage bicycles will tend to say that 'Everything ride-able--and a lot more things not--has already been done; I just can't find the picture'.
Vintage tandem bicycles that allowed a smaller rider in front were typically called "kangaroo" tandems.
I don't remember anything *exactly* like this, but I know I've seen a few that were very similar except for the handlebar arrangement.... -and I don't consider myself to be that great of a fan of vintage cycling. The vintage examples I recall vaguely had a more-complicated arrangement, which leads me to suspect that simpler ones were probably tried.