It's at home buzzing over dry ground, but then plunges into a pool. Here's how this strange flying machine works.
in London, they described how they developed the 3.6-pound quadcopter.
The issue is that while both water and air are technically fluid mediums, they have vastly different properties. The different viscosities and densities affect how the propulsion system should operate, as well as the overall design of the drone. To operate in the air, the drone needs to be able to overcome gravity. To operate effectively underwater, the drone needs to be neutrally buoyant and able to generate enough thrust to overcome water resistance.
The drone is slightly negatively buoyant, so when it hits the water it slowly starts to sink. Then, one way for it to travel underwater is for the whole drone to rotate, so the propellers pull it sideways through the water. Alternatively, the drone’s body can stay upright, and it can maneuver by tilting the props in different ways.
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