„How to avoid a Vortex Ring State in helicopter operations“ part I of III

The Vuichard Recovery Aviation Safety Foundation has just released the new safety video on “How to avoid a vortex ring state in helicopter operation” to the public.In this educational video in part one of three, pilots will learn the three prerequisites to build up a Vortex Ring State. It presents the aerodynamic background of the build up and the typical signs of a Vortex Ring State. Special is paid to the different vortex ring state sectors in relation to the rotor disk load. The video is packed with incredible animations and exciting new footage.
This instructional video, part one of three, uses incredible animation and exciting footage to illustrate the three conditions necessary for a Vortex Ring State to build up. The goal is for pilots to recognize the aerodynamic background of the Vortex Ring State at an early stage and thus prevent vortex accidents.
This Safety Video is a must for every helicopter pilot from beginners to professionals. Therefore, take your time to watch this video, as it contains an enormous amount of safety relevant information about VRS.

00:00 Copyright ©
00:48 How to avoid a Vortex Ring State in helicopter operations
01:59 Abbreviations and units used in these videos
02:14 Warning
02:57 Rotor disk load categories
04:14 Calculation of the induced velocity in function of the rotor disk load and the air density
05:49 How the Vortex Ring State builds up
05:53 The three prerequisites to build up a Vortex Ring State
07:35 Visualization of the build up of a Vortex Ring State
09:26 RoD Rate of Descent
10:49 Rules of thumb to calculate the final RoD in a Vortex Ring State
12:09 Final RoD floors/s in VRS @MSL
13:38 RoD range required to enter in a VRS and final RoD in VRS
15:29 How does the weight influence the different Vortex Ring State parameters?
17:55 In which low speed range can a Vortex Ring State occur?
18:33 The relation between TAS and IAS and 'WOOLOMETER" during HOGE and low speed operation
20:50 Different Vortex Ring State build up sectors in function of disk load
23:46 VRS sector in function of TAS
24:35 Risk of leveling off from the nose up or nose down attitude near or within the VRS build up sector
25:16 Difference between blade tip vortices, main rotor vortex and Vortex Ring State
29:24 Difference between blade tip vortices, main rotor vortex and Vortex Ring State
31:47 VRS detection and alerting systems in modern helicopters
32:55 What you are going to learn in Part Il of Ill is how to avoid a Vortex Ring State during:
33:59 Many thanks for the great support goes to the following Swiss companies:
34:50 Personal message of Claude Vuichard president of the „Vuichard Recovery Aviation Safety Foundation“

https://vrasf.org/