At what angle range is the maximum loading for an unsupported aerial device reached?

The correct answer highlights that the maximum loading for an unsupported aerial device is reached between 70 and 80 degrees. This angle range is critical because it reflects the optimal positioning for stability and weight distribution when the aerial device is extended. At this angle, the aerial ladder or platform maintains sufficient mechanical advantage, allowing it to support greater loads effectively.

When the angle approaches 90 degrees, the forces start to act more vertically, leading to a decrease in stability and an increased risk of tipping or failure under load. Conversely, at angles below 70 degrees, the aerial device may not reach its full lifting capacity due to inefficient force application, potentially resulting in a lower maximum load tolerance.

In summary, 70 to 80 degrees is optimal for achieving maximum load capacity while balancing stability and safety concerns, making it the ideal angle for the operation of unsupported aerial devices.