How does increased density altitude typically affect the required power for hover?

Increased density altitude increases the required power for hover. Density altitude is a measure of air density, and it is affected by altitude, temperature, and humidity. High altitude, high temperature, and high humidity all contribute to a higher density altitude, meaning the air is less dense. When the air is less dense, the rotor blades have to work harder to generate the same amount of lift. The rotor blades need to spin faster or at a greater angle of attack to move the thinner air downwards with sufficient force. This requires more power from the engine. Therefore, as density altitude increases, the engine must produce more power to maintain a hover. If the density altitude is too high, the helicopter may not be able to generate enough lift to hover at all, even with maximum engine power. This is a critical consideration for helicopter operations in mountainous regions or on hot days.