barefoot hydrodynamics

Ever since I discovered them, I have been fascinated by the Foxfire books. Not that I’m planning to go back to the land or anything, just they they often display flashes of ingenuity and craftsmanship.

Take this, for example:

tub wheel - from foxfire 2

It’s clearly a turbine runner, but it’s made from a slab of solid pine, pinned together then held in compression by steel bands around the rim.

sam burton chisels out a tub wheel bucket

It was made by Georgia craftsman Sam Burton, and is documented in Foxfire 2 (Wigginton et al, 1973, pub. Anchor Books, ISBN 0-385-02267-0, pp. 142-163).

convert an angle to a bearing in excel

I can’t believe I had difficulty with this one for so long:

 =MOD(450-angle,360)
This assumes you’re measuring the angle in the usual Cartesian way; anticlockwise from the x-axis.