blade tip vortices

  1. Trailspotter

    Helicopter aerodynamic dashed linear contrail

    While paying a visit to the place of my childhood in Russia ten days ago (September 15, 2016), I spotted this very unusual contrail: A local Aero Club regularly hires a Mi-8 (Mi-17) "Hip" helicopter for skydiving and related activities. It takes the jumpers to the altitudes of 2500 metres...
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