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Direct drive, chainless, folding, recumbent bike (German, experimental) - Open Knowledge — LiveJournal

Nov. 29th, 2003

08:00 pm - Direct drive, chainless, folding, recumbent bike (German, experimental)

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http://home.arcor.de/da-ckel/ddb/ddb.htm

Inspired by Thomas Kretschmer's original design.

riding chainless folding recumbent



chainless folding recumbent open

chainless folding recumbent folded

Comments:

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From:visgoth
Date:November 29th, 2003 05:35 pm (UTC)
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A single speed hub really kind of sucks. I wish him luck with the development of one with multiple gears.

Other than that, it looks kind of neat, but I'm not sure the adjusted seat angle is going to work as well as more "normal" recumbents. They've really put a lot of time into studying better seat angles, and this bike appears to throw all that straight out the window.

Still, much credit to him for just doing the design and *building something*.
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From:apotheon
Date:November 29th, 2003 06:12 pm (UTC)
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Until a multi-gear hub with coasting capability is designed for the thing I'm not terribly excited about it, to say nothing of the fact that it looks immensely uncomfortable. Actually, I prefer traditional-frame bicycles anyway. Both my grandfather and my father have recumbents (my grandfather's is actually a three-wheeled Wind Cheetah), and I'm just pleased as punch with my $3500+ traditional frame bicycle. I regularly outrun both of them, too (particularly on upslopes).
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From:crasch
Date:November 29th, 2003 09:19 pm (UTC)
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Yes, she looks like she's leaning too far back. But recumbents can be made more comfortable and faster than most uprights.
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From:apotheon
Date:November 29th, 2003 10:18 pm (UTC)
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The placement of the handlebars, the angle of her hips, the extension she gets with her legs, and a number of other factors play into how uncomfortable that looks to me, to say nothing of the fact that the wheel that is steered and the pedals are directly attached to one another, which means that steering too sharply will torque the ankles.

Not to split hairs (or brag, much), but my non-recumbent bicycle is not one of "most uprights". On the other hand, I know what you mean. Well-designed recumbents have the potential to be faster on the flat, and generally downhill as well, than upright bicycles. They generally suck uphill because of the alteration of leverage dynamics in the design, and there isn't as much long experience behind the design as for upright bicycles in part because they haven't been around as long but more importantly because there isn't nearly the market for them. They also suffer from a typically necessary greater total weight, generally reduced stability at low speeds, and greater individual expense both in initial investment (for the bicycle's rough level of quality) and maintenance.
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From:crasch
Date:November 29th, 2003 09:17 pm (UTC)
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Multiple speed hubs/drive shafts exist. This one doesn't appear to incorporate them though.
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From:visgoth
Date:November 30th, 2003 08:00 am (UTC)
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Yeah, I've seen 'em before, actually.

My German has atrophied, but if I read it correctly, he seems to be saying he's trying to design his own multi-gear hub. I'm assuming that this is because the bike wasn't designed to be compatible with existing ones.
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From:ernunnos
Date:November 29th, 2003 09:42 pm (UTC)
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That's pretty cool. The long chain path on bents is one of the worst things about them. Especially on the really low racers. Direct drive would solve a lot of problems. Still wishing my bent hadn't been stolen.
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From:troyworks
Date:November 30th, 2003 08:51 pm (UTC)
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I like the folding idea. I just wish wheels could be collapsible
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From:halleyscomet
Date:December 3rd, 2003 08:43 pm (UTC)
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I don't know. There's something sexual in the way she's riding that bike...
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