Kowshik Posted June 7, 2020 Share Posted June 7, 2020 Can any one plz clarify me that if speed for getting ETL is constant for each type of helicopter?? If not what all the the factors that will affect the speed of ETL?? Why there is range of speed 16-24 kts? Link to comment Share on other sites More sharing options...
VampireNZ Posted June 7, 2020 Share Posted June 7, 2020 "Effective translational lift (ETL) occurs with the helicopter at about 16 to 24 knots, when the rotor—depending on size, blade area, and RPM of the rotor system—completely outruns the re circulation of old vortexes and begins to work in relatively undisturbed air." Obviously dependant on wind and a/c weight also. Lots of great sources of heli aerodynamics info on the net to learn all about the subject. https://fas.org/irp/doddir/army/fm3-04-203.pdf https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/helicopter_flying_handbook/ Chapter 2 http://www.aerostudents.com/courses/rotorcraft-mechanics-and-design/SeddonBasicHelicopterAerodynamics.pdf https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19790009640.pdf Asus Maximus VIII Hero Alpha| i7-6700K @ 4.60GHz | nVidia GTX 1080ti Strix OC 11GB @ 2075MHz| 16GB G.Skill Trident Z RGB 3200Mhz DDR4 CL14 | Samsung 950 PRO 512GB M.2 SSD | Corsair Force LE 480GB SSD | Windows 10 64-Bit | TM Warthog with FSSB R3 Lighting Base | VKB Gunfighter Pro + MCG | TM MFD's | Oculus Rift S | Jetseat FSE [sIGPIC][/sIGPIC] Link to comment Share on other sites More sharing options...
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