Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Bernouli's principle?
An application of Bernoulli's principle is an air wing, where the shape gives the air plane its lift. Now if a military jet flies up-side-down the lift would be pointing downward, towards the Earth. Why does it not crash to the ground?
4 Answers
- 1 decade agoFavorite Answer
In this scenario, it is the thrust of the jet (directly) that keeps it in the air, not the lift from the wings. The jet is actually flying at a slightly upward pitch, so that even though the "lift" from the wings is directed down, there is a component of thrust directed up that keeps the jet "flying" upside down. It's really behaving more like rocket than a plane when flying like this.
- Anonymous1 decade ago
Steve's answer is correct. I would add that 90% of the lift from conventional wings comes from accelerating air downward, not from Bernoulli. The usual textbook explanation is very wrong.
- SteveLv 71 decade ago
The shape does NOT give lift.
The angle of attack gives lift.
All airplanes can fly upside down by adjusting the angle of attack so as to create lift in an upward direction.
Wings are shaped the way they are to minimize the drag while providing lift in the direction of the top of the fuselage. Many planes used in airshows have a symmetrical wing shape so as to have minimal drag whether inverted or upright.
- 1 decade ago
It would if it were not equipped with elevators at the back of the plane. Since the plane is going so fast, it can overcome bernouli's principle because if its forward speed and the deflection of air at the tail "pointing" it up....