Do you believe that Sikorsky would go through all the design studies, research and certification for a five bladed head just for the sake of a dozen or so SAR machines. They would if somebody was paying for it, but they're not. A decade ago I was talking to people at Westlands on ways to make the EH101 Heliliner more suitable for the North Sea. They weren't interested, the market wasn't big enough. The 330 prototypes suffered from horrendous viabration way back in 1966 and they were at the point of cutting metal for a five bladed head when some burk developed the barbeque plate that brought it down to an acceptable level. It was cheaper, a lot cheaper. It then took nearly forty years to put five blades on a 225. If the 330 and 332 had five blades in the beginning they would have been unstoppable. We can all dream about what would make a particular helicopter ideal but on the whole all utility helicopters are jack-of-all-trades, master of none.