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Gigapans

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  1. Heliport in Portland's Old Town. I took this because of the NOTAR helicopter. NOTAR means no tail rotor. It uses a ducted fan rather than tail rotor blades. Some 60% of helicopter noise is produced by the interaction of the tip vortices of the main and tail rotor. Used by police for patroling. en.wikipedia Will open in a new tab or window....

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