HUD à l'atterrissage...
Publié : jeu. déc. 01, 2005 8:20 am
juste un petit rappel...pour les derniers arrivés.
Quelques bons points de rappel cependant.
c'est du déjà connu pour la majorité des anciens...
==> Moving the stick forward or backward will as we all know control the pitch of the plane. Your guncross at the top is a good reference for the nosepitch: if your guncross is at 10 deg on the pitchladder, your nose is rised 10 deg from the horizon. It shows exactly what your ADI is showing you.
The bracket is in a fixed aspect from your guncross: The top of the bracket is -11 deg, downside is -15 deg and the center is -13 deg. So with moving the the stick back or forward, you can control the your pitch and thus the position of the bracket in relation to the horizon.
The FPM is indicating the Flight Path. During flight, you'll never go exactly where your nose is pointing. The angle between your nose and your actual flightpath is your AoA and is in fact the angle in which the wind is flowing over your wings. A too high AoA will cause your aircraft to lose lift. If the aircraft loses too much lift, you will stall. In other words: you will fall out of the sky. The AoA is directly linked to your Airspeed. You're able to fly 80 deg up, as long as your airspeed is high enough for your wings to produce enough lift to keep the airplane up. If your airspeed drops too low, you will lose lift and your actual flightpath will start to drop in respect to your pitch. In other words: your AoA increases.
This principle is crucial in understanding how to use the HUD symbology on landing.
You can control your FPM up and down the HUD with the same pitch (read: decrease AoA), you have to increase your airspeed, so apply a more throttle.
If you want to control your pitch, use the stick.
During the landing though, you will find that one thing will affect the other. Increasing your pitch will cause the thrustvector to be pointed upward a bit, so you'll loose some forward speed cause off the force vector. So eventually, to keep your FPM steady on the runway while adjusting pitch = adjusting AoA = adjusting Airpeed, you'll have to adjust your throttle setting as well. You'll find yourself constantly adjusting both parameters, but just remember:
THROTTLE CONTROLS Airspeed=AoA=FPM
STICK CONTROLS PITCH=BRACKET POSITION (=in the long run AFFECTING AoA due to loss of effectiveness on lift produced by the wings and thrustvector)
For the settings I use on landing:
On aproach:
-3 deg glideslope (FPM on the horizontal line on the pitchladder between 0 and -5 deg that comes up with the bracket as you lower the gear)
-11 deg AoA (FPM on the top of the bracket)
Quelques bons points de rappel cependant.
c'est du déjà connu pour la majorité des anciens...
==> Moving the stick forward or backward will as we all know control the pitch of the plane. Your guncross at the top is a good reference for the nosepitch: if your guncross is at 10 deg on the pitchladder, your nose is rised 10 deg from the horizon. It shows exactly what your ADI is showing you.
The bracket is in a fixed aspect from your guncross: The top of the bracket is -11 deg, downside is -15 deg and the center is -13 deg. So with moving the the stick back or forward, you can control the your pitch and thus the position of the bracket in relation to the horizon.
The FPM is indicating the Flight Path. During flight, you'll never go exactly where your nose is pointing. The angle between your nose and your actual flightpath is your AoA and is in fact the angle in which the wind is flowing over your wings. A too high AoA will cause your aircraft to lose lift. If the aircraft loses too much lift, you will stall. In other words: you will fall out of the sky. The AoA is directly linked to your Airspeed. You're able to fly 80 deg up, as long as your airspeed is high enough for your wings to produce enough lift to keep the airplane up. If your airspeed drops too low, you will lose lift and your actual flightpath will start to drop in respect to your pitch. In other words: your AoA increases.
This principle is crucial in understanding how to use the HUD symbology on landing.
You can control your FPM up and down the HUD with the same pitch (read: decrease AoA), you have to increase your airspeed, so apply a more throttle.
If you want to control your pitch, use the stick.
During the landing though, you will find that one thing will affect the other. Increasing your pitch will cause the thrustvector to be pointed upward a bit, so you'll loose some forward speed cause off the force vector. So eventually, to keep your FPM steady on the runway while adjusting pitch = adjusting AoA = adjusting Airpeed, you'll have to adjust your throttle setting as well. You'll find yourself constantly adjusting both parameters, but just remember:
THROTTLE CONTROLS Airspeed=AoA=FPM
STICK CONTROLS PITCH=BRACKET POSITION (=in the long run AFFECTING AoA due to loss of effectiveness on lift produced by the wings and thrustvector)
For the settings I use on landing:
On aproach:
-3 deg glideslope (FPM on the horizontal line on the pitchladder between 0 and -5 deg that comes up with the bracket as you lower the gear)
-11 deg AoA (FPM on the top of the bracket)
merci à toi 
