As with a fishing pole, deflection of a telescopic boom is significant even with low loads. In addition, at low boom angles, the dead weight of the boom contributes significantly to overturning. However, at low boom angles, the telescopic boom's capacity decreases rapidly because of limited bending capacity. (For high boom angles, the internal loading is mostly compression.) As such, they are extremely strong and have a high lift capacity when almost vertical. Telescopic booms, on the other hand, carry their load as flexible, cantilevered box beams, much like fishing poles.
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