Why is it necessary to limit the lowest stream angle of a portable monitor?

Limiting the lowest stream angle of a portable monitor is crucial primarily to prevent instability of the monitor. When a monitor operates at a very low angle, especially during high flow scenarios, the forces exerted by the water stream can create a significant backward thrust. This backward thrust can lead to instability, making it difficult for firefighters to maintain control of the monitor.

If the monitor tips over or shifts position due to these forces, it can pose a safety risk to firefighters and may also impact the effectiveness of the water delivery. Maintaining a proper stream angle helps to balance the forces, ensuring that the monitor remains secure and stable throughout its operation. This stability is essential not only for the safety of the firefighters but also for delivering firefighting water in an effective manner.

Addressing stability effectively contributes to a more controlled and predictable operation of the monitor, allowing for better tactical decisions in firefighting situations.