I’m watching videos of rescue helicopters and noticed that some have their blades form a cone when flying low in bodies of water. This doesn’t seem to happen often on land so why in water?
In: Physics
It is probably related to the speed of forward motion . A helicopter flying faster than about 15 to 20kts gains translational lift, and requires less power to fly. Think of the rotor disk acting as a wing .
Slower than that needs more power. Out of ground effect, even more power.
The more power required, the more the blades will flap, and you see the cone shape .
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