WOW!
now thats thinking. still would not like to be near it! lead undies for flying the russian choppers?
how fast does it decay? Hygrometers deffo not the way forward, you would want something that could do the calculation for you (knowing the OAT and Dew point) and do it thousands of times very quickly. is there not a glass panel EFIS that does this? i seem to remember readign about one somewhere?