The Kopp-Etchells effect is a result of dust striking helicopter blades as they take off or land at night, causing a bright ‘halo’ around the spinning rotor disk. More pics here, via: thisrecording: tumbledore

The Kopp-Etchells effect is a result of dust striking helicopter blades as they take off or land at night, causing a bright ‘halo’ around the spinning rotor disk.

More pics here,

via: thisrecording: tumbledore

by kenyatta
via thisrecording
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