Bikes made of wood
Here's a interesting site. All wood all the time. Lots of good stuff here. What a magnificent builder.
http://www.renovobikes.com/storage/t...=1261201095355 And for those of you who want to go fast. http://www.renovobikes.com/picture/s...leryImage=true |
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there's something sad about that one.
i feel it right here. |
Thats some serious piece of kit. I expected to see a plywood bike that i saw some time ago but cant remember the web address. It's not in the same league anyway so it doesn't matter.
Ah there it is: http://www.sandwichbikes.com/ No, not in the same league at all...... ollie |
Hydrocarbon fiber is a wonderful material. If used in a design that separates the parts that need rigidity from those that need flex, it would perform far better still.
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Hey Bob, help us out here, whadda u mean? |
Wood is a form of hydrocarbon fiber. Figure out the rest.
Here's some more ideas - more DIY than kit form: Endless-sphere.com • View topic - Wooden bicycles, lots of pics |
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The entire bicycle frame flexes, both in torsion and bending. To my knowledge, there are no parts which 'need' flexibility, unless one is referring to tires. Flexibility, as the opposite of stiffness, is a relative property controlled by the designer of the bike to produce the desired ride qualities and performance, from race to beach cruiser. One doesn't just add some flexible parts to the stiff ones to make a bike... |
A standard bike frame is designed to be inherently light and rigid. Since nothing is perfectly stiff, there is some flex, which the manufacturers say they added for comfort, trying to have it both ways. A bike with long suspension travel and soft springs is a major revelation to ride. It can still be simple and elegant, and far more comfortable if laid out as a recumbent, so that the necessary rigid connection from seat to pedals is at right angles to the flex on bumps. Most of the wooden frames are pretty, but rather appalling, structurally. On a classic frame, the highest stress is on the down tube, where it resists the rocking of the bottom bracket, yet many artists eliminate this part completely. It takes great skill in pedaling to avoid wasting the energy that produces flex.
I designed and built a recumbent trike in which just six fiberglass parts provided seat, frame and a very sophisticated suspension. Only the dampers needed to be separate parts. I'm interested in doing it over using mostly wood. The Car Cycle |
That's awesome, Bob!! When you shave you really do look like a crash-test-dummy.:D
I'm trying to re-purpose an old bike frame into an extension for my Greenspeed GTO, that will incorporate my 26" motor-wheel and battery without molesting the original Greenspeed frame. I also have about 25 composite ski poles that I might be able to use to build a different frame, or suspension components. I'd eventually like to enclose the trike in Coroplast, but for now I just want to get the frame extended and powered up. Any ideas?? Any pix of the framework under the body of the Car Cycle? |
hydrocarbons
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We crossed messages here. |
Guitarguy, there's a link on that page to Car Cycle with lots of chassis details.
I'd have to see your shop, parts, and skill set to suggest ways to work on the Greenspeed, but ski poles are not an efficient cross section for a leaf spring. However, they have a gradual failure mode, and get more from the materials than we can with garage techniques. |
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