buttline :
My understanding is that a fair chunk of s/e f/w is certified for flight in IFR, if not in icing.
Any s/e helicopters you're aware of ? The problem as I understand it is lack of stability - Whirlybird wrote a 160 word piece on the problem - and the Bristow 206 has SAS in it.
So, why can't we just use an ex-mil Gazelle