AC/DC
do you have a link or web address for either of the systems you mention? Sounds something like what i was thinking! As far as ice build up goes, i did an experiment with my instructor in a Traumahawk. We entered cloud, a big cumulus one well below freezing and the ice built up very quickly. Although decending lost it all pretty quick. I suppose my main worry is if you are in freezing conditions and dont have the height to loose, what options do you have then? Its better to be on the ground wishing you were up there, than being up there wishing you were on the ground!