Development of a Tow Capability for the HH-3F Helicopter
NAVAL AIR TEST CENTER PATUXENT RIVER MD
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An extensive evaluation was conducted to determine the capability of the HH-3F helicopter to tow the Fast Surface Delivery FSD System. The aircraft flying qualities, aircraft response to simulated emergencies, Automatic Flight Control System, and the simplicity and reliability of the tow equipment enhance the ability of the HH-3F helicopter to fulfill the requirements of the U.S. Coast Guard tow mission. Mission limitations are imposed by the low power margin at high gross weights in the low speed tow regime. Inefficient transmission oil cooler operation limits the amount of time allowed in a downwind tow condition. Further testing is recommended to determine pilot fatigue limitations due to unusual aircraft attitudes during tow operations. Also, additional testing is necessary to determine the effects of higher sea states on the aircraft and FSD combination. Within the scope of this evaluation, the HH-3F helicopter and FSD tow combination is satisfactory for the U.S. Coast Guard operational tow mission.