In January 2018 the blades were blown off the turbine yet again!!! for photos see here

After a long search I found some Aluminium Blades from the USA which I put on in September 2018. These lasted longer than the Wooden Blades, but only two and a half years. John-Joe Bowen at Bowen's Forge, just up the road, is a magic Blacksmith who made some new blades for me from 4mm Aluminium Sheet. These are 1mm thicker than he previous one. I decided it would be interesting to compare the performance of these three types of blade, so below are graphs of RPM and Output in Watts for the three blade types.

Turbine Blade Performance Graph
Wind Turbine Blade Performance Compared