Poncelet's curved blade design incorporated a constantly decreasing radius curve. It was less curved at the outer diameter, and more curved at the inner diameter, like the outside of a French curve template.
Ideally this is the way I would have built the blades. However, the shop that curved the aluminum blades wasn't capable of that, at least not without spending a pile of money.
The wheel is still running on the roller bearings. Maybe there is nothing wrong with them? I've ordered the wood bearings and they crossed the border from the US. Hopefully I'll get them sometime soon. I sometimes lay awake at night thinking the roller bearings will fail and the wheel will fall into the river and get washed away forever
Do people's solar panels keep them up at night worrying?