Yeah I realised it was peripheral but to me it did highlight a lack of observed effect or even curiosity about the effects of adhering water. As it cant sustain shear, unlike ice, aater would seem a poor candidate for change of aerofoil characteristics. I did wonder why I never came across any discussion of saturation or water loading in any discussion. Perhaps it just reflects the tendency of engineering to address practical issues ie this isn't a significant effect. Should change the physics and equations of state though. I'll have a chat with the modellers but they tend to be rather led by the models rather than otherwise.