The blades were made of wood (gulp)
So was the Mosquito, and it seemed to manage. Having said that, I gather that the blades could absorb differing amounts of moisture, which made blade tracking a bit difficult. I'm sure Cornish Jack can enlighten us, once he's finished his Horlicks. I just missed the joys of the Sycamore, and was on one of the first courses on the Sioux. (CJ, which tablets?)