BtZ42 p.4 - curved spokes

[David Morris]

http://www.freepik.com/free-photos-vectors/yin-yang

Yin Yang is a single S-shaped spoked wheel.

David Morris

On Sunday, March 20, 2016, Monte Davis <montedavis49 at gmail.com> wrote:

> Maybe not just a design style: according to a machinists' blog, curved
> spokes were functional in cast-iron flywheels, pulley wheels etc.:
>
> "Spokes shaped like an S, a spiral, a set of semicircular arcs, all do the
> same thing - allow some needed compliance so that the spokes or rim don't
> fracture when cooling [and shrinking at different rates depending on
> thickness, shape, position]... Steel or aluminum have more favorable
> stiffness to strength ratios or, perhaps more importantly, more available
> plastic yield before fracture, and are therefore not so fussy about
> shrinkage. And forged, wrought, or fabricated wheels don't have the same
> shrinkage problems that castings do. But back when cast iron was king,
> shrinkage fractures were a constant headache."
>
>
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