The scimitar shape has the end of the blade trailing, so air load flattens the angle of attack, somewhat akin to the wing warping of the Wright Flyer.
If I were to make such a prop, I would use only Shagbark Hickory or Osage Orange. Both are strong, yet flexible. Henry Ford made nearly a billion hickory spokes for the Model T's wheels. No other commercial wood has the strength, yet flexibility, of a true hickory. It grows only in the US and Canada, I believe, which is why other countries' cars were earlier to adopt wire wheels in quantity.
Osage Orange is even much tougher than hickory, but not widely available. I've seen hickory used for firewood.
GB