Why do aircraft fly with a slight nose-up attitude throughout the flight?
Thanks for the question…Aircraft generally fly at altitudes of 35,000–40000 feet above mean sea level. At these altitudes, air density is very much low. To maintain the necessary lift to hold the aircraft up in the air, the nose is slightly pitched upwards.Pitching the nose upwards, increases the aircraft's angle of attack (AoA).Since, lift is directly proportional to the AoA of the aircraft, the airplane flies at slight nose pitch up attitude, even in level flight.Do you know that there are some aircraft(s) which fly at a nose down attitude??There are some aircrafts which fly with a nose down attitude. A good example is the Boeing B-52 Stratofortress.This is because the relative angle between the wing and the aircraft's body is very high. Therefore, the wings are already at high angle of attack, even on the ground.If the aircraft would fly straight, without pitching the nose down, the high angle of attack of the wing would cause the aircraft either to stall or to climb.This would prevent the aircraft from maintaining a level flight.Therefore, it flies with a “nose down attitude”, to maintain a level flight.Hope you got your answer. Please upvote, if helpful.Thanks for reading….
Why do airplane wings on the ground appear with a zero degree angle of incidence?
Angle of incidence is the angle between the chord of the wing and the longitudinal axis of the fuselage and is a physical characteristic of an airplane.This diagram shows the angle for the purposes of definition, but it is quite exaggerated. Angles of incidence are usually set so that the fuselage, and as a result the cabin floor, is level or slightly nose up during cruise. The angle of incidence on airliners are often very small…two or three degrees. Since you cannot see the chord line of the wing, or the longitudinal axis of the airplane, in the picture you provided, you cannot be sure of the angle of incidence. All you are seeing is that the wing appears to be level with the ground which is, of course, meaningless.BTW, since the angle of incidence is a fixed characteristic of an airplane, it doesn’t matter if the airplane is on the ground or cruising. The angle of incidence remains unchanged.
How does the weight and balance of an aircraft work?
For each aircraft there are many weights BOW Basic Operating Weight MTOW Max. Takeoff Weight MZFW Max. Zero Fuel Weight Max. Usefull Load (Basically MTOW minus BOW) Max. Payload (passengers, cargo not counting fuel) And many more, each is designed to provide the pilot with performance data. Balance refers to how an aircraft is loaded, each aircraft has an envelope that determines is it is safe to fly as loaded. If loaded too far forward, it may be imposible to rotate (takeoff), if too far back the nose may rise uncontrolled and the aircraft will stall. Both of these have caused accidents in the past. In these cases the CG of the aircraft moves outside the approved envelope and the tailplane does not have enough authority to controll the aircraft's pitch (nose up or down)
Now that this is the second Boeing 737 Max 8 jetliner crash shortly after take off in five months, is there a design flaw or no?
And should all Boeing 737 Max 8 jetliners be grounded ? The Ethiopian Airlines jet that crashed shortly after takeoff on Sunday, killing all 157 people aboard, is the same make and model as the plane that crashed off Indonesia last year with 189 deaths Officials lost contact with Flight 302, a Boeing 737 Max 8 jetliner flying from Addis Ababa, the Ethiopian capital, to Nairobi, the Kenyan capital, at 8:44 a.m. (1:44 a.m. ET), authorities said. That was about six minutes after the plane took off from Bole International Airport, they said. Tewolde GebreMariam, the airline's chief executive, said that the captain reported "difficulties" and asked to return to the airport but that then the plane "was lost from the radar — it disappeared." The Ethiopian Airlines jet had been in service for only four months and had no known technical issues, GebreMariam said. In late October, Lion Air Flight JT610 — also a Boeing 737 Max 8, which had been in service for only 2½ months — crashed into the sea shortly after takeoff from Jakarta, the Indonesian capital. Indonesian authorities said that contact with Flight JT610 was lost after 13 minutes and that the captain reported a "flight control problem." Pilots flying the same plane a day earlier had experienced a similar problem, authorities said.
What is the stall out speed of a boeing 747-400?
Technically, you can stall an airplane at any speed. For instance increasing the load factor on a wing (by banking) you increase the stall speed.It is the angle of attack you should be concerned with not the speed. In unacclearted flight you have stalling speed in the landing configuration (flaps, spoilers, gear down etc) will vary according to weight. I will be different than the stall speed in the clean configuration,again varying with gross weight. For Sim purposes, around 110 knts indicated should get you in the ball park.