There seems to have been a few too many ditchings around OZ & the US this last fortnight. I believe all the helicopters had pop out floats, which usually work well, but in these last 3 cases none of the helicopters landed safely on the water which would have prevented the fatalities. Pilots can only practice water landings on fixed floats which are easy but obviously can't practice with pop outs. I wonder if this is causing these tragic ditchings?