With some exceptions, an Employee is covered by the HCSO if the Employee works for an Employer covered by the HCSO and: 1  Is entitled to be paid the minimum wage; 2  Has been employed by the Employer for at least 90 calendar days; and. 3  Works at least 8 hours per week in San Francisco.
Vortex ring. Spark photography image of a vortex ring in flight. A vortex ring, also called a toroidal vortex, is a torus-shaped vortex in a fluid or gas; that is, a region where the fluid mostly spins around an imaginary axis line that forms a closed loop. The dominant flow in a vortex ring is said to be toroidal, more precisely poloidal.
This is âvortex ring.â What is Vortex Ring. Sometimes considered as the equivalent of the fixed wing stall, and called âsettling with powerâ in some countries, vortex ring state is a condition of powered flight in which the helicopter descends into its own downwash, or the air being forced down by the blades.