The Grumman HU-16 Albatross is a large twin-radial engine amphibious flying boat. Originally designated SA-16, it was renamed HU-16 in 1962. The Albatross was designed to be able to land at sea in open ocean situations in order to effect the rescue of downed pilots. Its deep-V cross-section and substantial length helped make it possible for it to land in wavy conditions. Since it weighs over 12,500 pounds, pilots must have a type rating in order to act as pilot or co-pilot on board the Albatross. There is a yearly Albatross fly-in at Boulder City, Nevada, where Albatross pilots can renew their type ratings.