Final answer:
The load factor on the wings or rotors of an unmanned aerial vehicle (UA) may increase when there are changes in flight conditions or during aerobatic maneuvers. This can lead to higher forces on the wings or rotors, potentially causing structural stress. It is important for pilots to consider the load factor to prevent a loss of lift and potential crashes.
Step-by-step explanation:
The load factor on the wings or rotors of an unmanned aerial vehicle (UA) may be increased at any time when there is a change in the flight conditions that affects the forces acting on the aircraft. For example, when the UA encounters turbulence or performs aerobatic maneuvers, the load factor on the wings or rotors increases. The load factor is the ratio of the lift or rotor thrust to the weight of the aircraft. When the load factor increases, the wings or rotors experience higher forces, which can lead to structural stress and potential failure if exceeded.
One way to understand the load factor is by considering the rotational kinetic energy of the blades in a helicopter. Helicopters rely on rotational kinetic energy to maintain lift, and if the blades slow below a critical angular velocity, they lose lift. To avoid a crash, the rotational kinetic energy of the blades must be replenished by supplying energy to make them rotate faster. However, the small engines of helicopters are limited in their capacity to provide both lift and replenish rotational kinetic energy. Therefore, it is important for the pilot to consider the load factor and avoid situations where the rotational kinetic energy of the blades might drop below a critical level.