During a recent evaluation flight for a modification, the winshield and windows of the EC120 I was flying completley fogged over, to the point where I flew circles over the airport for ten minutes completely eyes in, while my fellow pilot managed all the heat, air and fans he could, to clear the winshield. Even after this effort, only a modest amount of the winshield was useable to see to land.
Conditions of flight: Midday, temp 16C, RH or dew point not reported, but I'm guessing near 100%, higher overcast, 1000 feet ragged broken, and 500 feet ragged scattered, with light rain. Vis 4-5 miles.
Thoughts on this alarming experience, and what to different next time, would be welcomed...
Pilot DAR