Sonntag, 24. Mai 2015

Improved plywood frame


Over the last weeks I completed a new wooden frame.
It's build like my previous frame from 4mm plywood and spruce stringers.
This time I have used gaboon/okoume plywood (marine grade) instead of birch.
It's more rot resistant and much lighter than birch plywood, it has just 2/3 or less the specific density of birch.
I also decreased the height of the frame from 20cm/8in to 18cm/7in to get a slightly lower seat position.
While the birch frame from two years ago weights 25kg, the new okoume frame weights just 16kg.
Wow, 9 kg saved !!!
That's the weight of a complete racing bicycle.
I hope, to save another 10 kg in the new bodywork, also made from okoume.

Frame without top panel shows the spruce stringers

On the scale

Nearly 15kg and a few pieces still missing

A quick mockup in the garden

The lines of the future bodywork