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Forum DRAPO nuisances aériennes Paris-Orly sud-francilien • Voir le sujet - Angle de décollage ?
Page 1 sur 1

Angle de décollage ?

MessagePublié: Jeu Aoû 19, 2010 12:32 pm
par Fred91270
Bonjour,

je regarde les avions décoller, de ma fenêtre, ce midi, jeudi 19 aout 2010, et j'ai l'impression qu'ils passent "plus haut", mais surtout que l'angle de décollage est plus important.
Je me fie à un poteau d'éclairage public, d'habitude ils passent juste "au sommet" de ce poteau, et là, depuis ce midi, ils passent nettement au-dessus.

Ont-ils modifié l'angle de décollage, ou la trajectoire ?

Re: Angle de décollage ?

MessagePublié: Jeu Aoû 19, 2010 2:28 pm
par Airman
Bonjour,

Il y a plusieurs réponses possibles à ce phénomène. Si cela concerne tous les avions, quel que soit leur type, il est probable que le vent de face soit plus important, ce qui fait qu'à pente de montée identique, la distance parcourue au sol est plus faible dans un même temps. L'avion monte plus vite, mais avance moins vite par rapport au sol (vitesse sol plus faible, en clair).

En résumé, vent de face plus fort, à angle égal, on monte plus fort. Je constate ça régulièrement dans mon coucou, quand il m'arrive d'être cent à deux cents pieds plus haut en passant l'extrémité de la piste, par rapport à un vent calme. Et c'est pareil pour les gros culs.

Un avion moins chargé aura également une pente de montée plus forte, et certains types d'appareils sont également plus performants. Pour l'ironie, les Américains prétendent que les Airbus se servent de la courbure de la Terre pour s'éloigner du sol, par exemple.

Re: Angle de décollage ?

MessagePublié: Jeu Aoû 19, 2010 9:43 pm
par icaram
Bonsoir,
Est-ce que la température ne joue pas aussi un rôle très important ??
Si l'air est froid, il est plus dense (c'est de la physique pure) et donc plus porteur ==> la portance est plus grande, l'avion grimpe plus "vite".
Et comme il a fait bigrement frisquet ces derniers jours ...
Pilote Airman, votre science, svp.
Merci.

Re: Angle de décollage ?

MessagePublié: Ven Aoû 20, 2010 5:31 pm
par Airman

Re: Angle de décollage ?

MessagePublié: Ven Aoû 20, 2010 5:35 pm
par Fred91270
Bonjour,

en effet, aujourd'hui, décollage plus bas et trajectoires normales 8-)