Quick Answer
Smoke signals can be seen from helicopters under favorable conditions, but their visibility is greatly influenced by factors such as smoke density, height, and atmospheric conditions. In general, smoke signals can be visible from helicopters at distances of up to 10 miles (16 kilometers) in clear air.
Factors Affecting Visibility
The visibility of smoke signals from helicopters depends on several factors. The smoke itself must be dense enough to be seen, but not so dense that it blocks the surrounding environment. The ideal smoke density for signaling is when the smoke is visible for 1-3 seconds after a signal is made, and then dissipates. This allows the signal to be seen clearly without obstructing the surrounding view.
Height and Distance
The height of the smoke signal and the distance between the signal and the observer are also critical factors in determining visibility. A smoke signal made at a height of 10 feet (3 meters) or more above the surrounding terrain can be seen from a greater distance than one made at a lower height. In general, a smoke signal can be seen from a helicopter at a distance of up to 10 miles (16 kilometers) in clear air, but this distance can be reduced to as little as 1 mile (1.6 kilometers) in hazy or dusty conditions.
Techniques for Improving Visibility
To improve the visibility of a smoke signal from a helicopter, it’s essential to use the right type of fuel and to make the signal in a location where the wind is blowing from the observer’s direction. The use of dry wood or other fuels that produce a lot of smoke is recommended, as they can produce a signal that is visible for longer periods. It’s also essential to make the signal in a location where the surrounding terrain is not obstructing the view, such as on a hilltop or in a clearing.
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