Page 5 - Principles of flight – Helicopter
P. 5
5.6 Hover ........................................................................ 40
5.6.1 Hover ved specielle omstændigheder ................................ 40
5.7 Forlæns flyvning ........................................................ 42
5.8 Grundlæggende aspekter af vandret flyvning ............. 43
5.8.1 Cyclic tilt af rotordisc ......................................................... 43
5.8.2 Rotorblade tiltet fremad .................................................... 43
5.8.3 Usymmetrisk lift ................................................................ 44
5.8.4 Blow-Back .......................................................................... 47
5.8.5 Translational lift ................................................................ 48
5.8.6 Traverse Flow Effekt (inflow roll) ....................................... 49
5.8.6.1 Height-Velocity Diagram (dødmandskurve) .............................. 49
5.8.7 Drej ................................................................................... 51
5.8.8 Vindens effekt på IAS og Translational lift ......................... 53
5.8.9 Landingsflare (udfladning) ................................................. 55
5.9 Stabilitet og manøvrering .......................................... 56
5.9.1 Statisk stabilitet ................................................................. 56
5.9.2 Dynamisk stabilitet ............................................................ 56
5.9.3 Helikopterens akser og bevægelser ................................... 57
5.9.4 Manøvrering ...................................................................... 58
5.9.5 Stabiliserende metoder ...................................................... 58
5.10 Farlige flyvetilstande ............................................... 61
5.10.1 Retreating Blade Stall ...................................................... 61
5.10.2 Settling with Power (Vortex Ring State) ........................... 62
5.10.3 Dynamic / static rollover ................................................. 64
5.10.4 Ground Resonance .......................................................... 64
5.10.5 Mast Bumping ................................................................ 66
5.10.6 Blade Stall ....................................................................... 67
5.10.7 Tail Striking ..................................................................... 68
5.10.8 Autorotation .................................................................... 68
5.10.8.1 Autorotation trin for trin ........................................................ 72
Henning Andersen, Midtjysk Flyveskole 2021, h.b.sunds@gmail.com S. 5
