Fantastic Spiral Turbines from the 1930s (special thanks to Paul Dunlop for the heads-up)
Marvelous soft-steam-punk ambiance in the photos. These one are from Germany.
Speaking of history repeating (or not) though, these things are still being made.
(from has lots of flow-analysis diagrams)
You can get them off alibaba
Or for small hydro-power applicatiosn – these from the Czech Republic (which is one of my fav places)
But back to the age of steam though…
I love the lighting in these photos. Cinematic – reminds me of THX1138, although the design aesthetic is a 100 years older. Something to do with attention to the light.
Anyway – these things are called Francis Turbines – invented in France in the 1800s – James B. Francis (from Massachusetts) applied maths to the design and took the efficiency from 80% to 90%.
So is it a Fibonacci spiral?
Nope. Miles off – not even close… but then again, the famously fibonacci-like nautilus is not actually a Fibonacci spiral though, as can be seen from this little mockup.
This design actually IS true fibonnaci though
Faith in numbers.