toocatsoriginals: CH-47 Chinooks in Afghanistan Demonstrating the “Halo Effect,” Officially Known as the “Kopp-Etchells Effect” - When Sand and Dust Hit a Rapidly-Spinning Rotor. Sand and dust hitting a spinning helicopter rotor can cause erosion,

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toocatsoriginals: CH-47 Chinooks in Afghanistan Demonstrating the “Halo Effect,” Officially Known as the “Kopp-Etchells Effect” - When Sand and Dust Hit a Rapidly-Spinning Rotor. Sand and dust hitting a spinning helicopter rotor can cause erosion,

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