https://aviationweek.com/business-aviation/flight-deck/how-avoid-vortex-ring-state-part-2
How to Avoid a Vortex Ring State, Part 2 helicopters can drop rapidly in some conditions -- You received this message because you are subscribed to the Google Groups "massfire" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/massfire/CAFXWwKaJ87rZPCgvDcfBnM0KqLgXHuXkxNOpgQvZNY07OgDE6w%40mail.gmail.com.
