Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Bell HSL (Model 61) was an American 1950s anti-submarine warfare (ASW) helicopter built by Bell Helicopter company, the only tandem rotor design designed by Bell.On 3 March 1953 the prototype Bell Model 61 first flew, it had been designed to meet a United States Navy requirement for an anti-submarine warfare helicopter. In June 1950 the Model 61 was announced as the winner of the competition, three XHSL-1 evaluation aircraft were ordered. The Model 61 was had a rectangular-section fuselage structure and a four-leg, six-wheel landing gear. It was powered by a Pratt

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