Bookworm, yes, snow seems quite ok to fly through, both in and below cloud, but it can create some wierd visual illusions, especially if strobes are on.
On the sublimation question, I don't understand
Keef's interjection, as I thought I said "sublimate" throughout. (If I didn't I meant to.) However, Keef is quite right that the performance I heard Maxim Vengerov give of the Kreutzer Sonata this evening (on the Kreutzer Stradivarius) was sublime.
And,
bluskis, I have been saying all along that ice/vapour sublimation is
irrelevant to flight, it was IO540 who thought it might be, I simply (and I think correctly) took issue with you as to whether it
exists, which, I still hold, it does.
Hmmm, we seem to have come a long way from whether IR's are worth the candle.
Timothy