![]() Unmanned aerial vehicles can be designed for much greater load factors, both positive and negative, than conventional aircraft, allowing these vehicles to be used in maneuvers that would be incapacitating for a human pilot. ![]() Humans have limited ability to withstand a load factor significantly greater than 1, both positive and negative. : 398 When the load factor is negative, all occupants feel that they are upside down. ![]() When the load factor is zero, or very small, all occupants feel weightless. For example, in a 2 g maneuver all occupants feel that their weight is twice normal. When the load factor is greater than +1 all occupants feel heavier than usual. When the load factor is +1, all occupants of the aircraft feel that their weight is normal. The maximum load factors, both positive and negative, applicable to an aircraft are usually specified in the aircraft flight manual. For example, the Sukhoi Su-26 family has load factor limits of −10 to +12. However, many aircraft types, in particular aerobatic airplanes, are designed so that they can tolerate load factors much higher than the minimum required.
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