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Version 1.5
Please help fund the development and construction of WoodBike v1.5...
OK, a triangular prism is stronger than a
sheet (you don't have to hit me with a brick), and is therefore
lighter for the same strength. As a result, the tailbox (heavy,
complicated structure) and triple laminated seat and front spars
(heavy!) are gone and have been replaced with a triangulated
box of 12mm sheet and a simplified seat spar.
This has made the head simpler, as the 2 sides
of the box form a triangle with the rear axle, leaving enough
room for the head tube between them. The end result is hopefully
going to be much stronger and lighter than v1.2.
I'm glad I had this brainstorm before constructing
1.2! Using this design, with the parts precision cut and assembled
using stitch-and-glue construction, I should be able to keep
the steel parts to rear axle brackets, head tube, fork and front
bracket, plus a few nuts, bolts and pulleys here and there. An
Adobe Acrobat version of the complete plans is available here. You will
need Acrobat
Reader to view and print them.
I still hope to do a wooden fork (Son of WoodBike?)
but I want to prove the main concept first. To that end, I'll
probably use a BMX fork.
Statistics
* Wheelbase = 1010mm
* Wheel dia. = 510mm
* Seat height = 550mm
* Pedal stroke = 1000mm to 1200mm (adjustable at construction
stage)
Version 1.2
The head tube will be 2 sockets, welded to
the tube and bolted and glued to the seat and front spars. A
little more steel than I'd planned for, but necessary just the
same. The rear wheel structure will be a triangular box shape,
glued and stitched and screwed to the seat spar. I may give up
on wooden forks although Peter Hans has pulled off this trick
with his wooden upright, so I haven't decided yet.
Anyway, here's the drawings, lovingly crafted
with one hand due to my crash...
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