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Research aircraft Michael. To power more research payload. More power available, means a more valuable aircraft. NOAA, NSF, NRL, British Arctic Survey etc..
NSF recently bought a new G-5 with 30 million in added structural modifications to add to their research aircraft fleet. How many Twin Otters is that? For low altitude research, slow airspeed means higher particle resolution. The Twin Otter has proven itself extremely valuable in terms of payload utility, reliability, and, operational cost efficiency, though a little lacking in mission endurance or loiter time.
More wattage available means more science equipment. More science equipment means more missions. More missions means MO MONEY.
We all know what mo money means.