Piasecki H-21, Naval Aeronautics Museum (fr. Musée de l’Aéronautique Navale) in Rochefort. The Piasecki H-21 Workhorse/Shawnee is an American helicopter, the fourth of a line of tandem rotor helicopters designed and built by Piasecki Helicopter (later Boeing Vertol). The H-21 was originally developed by Piasecki as an Arctic rescue helicopter.
