I came across a very interesting article on CNN this morning that speaks to the design of the 737 max.
Basically Boeing has stretched the old 1960's airframe over time to make the old design match what the market is now demanding. In addition they have had to move the engines from where they were originally attached which is problematic.
What is interesting about this is that it shows that there are basic constraints inherent with the original design from the 1960's (when this plane would have been engineered with slide rules) that Boeing is trying to find "work - rounds" for. You just can't change a planes bones like that.
I smell that Boeing was fucked with its latest generations of planes. They were too big to fill and the only thing Boeing had in its catalogue that came close was the 737 and it was a grand pappy. Designing a new state of the art plane would take a pile of money and a pile of time. Not attractive to the Beancounters of Boeing.
So what did they do?
Dust off the 737.
I flew in 737s 30 years ago, but they seemed to disappear. Now they are back with a vengeance. The airlines have figured out what they need in terms of size and fuel economy and Boeing answered the demand with a plane almost 60 years old. It was either that or wait 7 or 8 years while their engineers came up with a modern design to match the demand and during that time airbus happily eats Boeing's lunch and sells the 320 (and now the state of the art C series).
Here is an interesting excerpt from the article on CNN
(CNN) — The tragedy of Ethiopian Airlines Flight 302, a crash that killed 157 people this past Sunday, has uncomfortably similar characteristics to Lion Air's October 29 crash in Indonesia. Both airplanes are Boeing's latest offering, the 737-800 MAX.
As many are aware, the 737 design has been a safe and reliable airline fixture since it began service in the late 1960s. The airplane's fuselage has been stretched with almost each new variant, but the cockpit remains the same basic configuration with the only substantial difference being a change to contemporary avionics technology, which involves a "glass cockpit" with electronic instrument displays rather than the old style "steam gauges."
Additionally, the MAX's two engines are powered by the latest fuel-efficient technology. Because the engines are larger and have more thrust, Boeing had to mount them farther forward on the wing and slightly higher -- basically so they wouldn't strike the ground on takeoff or landing. To compensate for the engine's mounting position and greater thrust, Boeing designed an automatic system called MCAS (Maneuvering Characteristics Augmentation System) that would prevent the nose from pitching too high when pilots hand-fly the airplane at slower speeds, typically during takeoff and landing. The nose pitching too high translates into an angle of attack (the angle between the wings and the air flow) that could potentially cause an aerodynamic stall.
What's problematic is that the MCAS system is invisible to pilots. As a matter of fact, Boeing failed to inform many airlines via the airplane operating handbook that it even existed. If the system has a fault, and it senses an aerodynamic stall that doesn't exist, pilots are left trying to wrestle an airplane that is heading for the ground because MCAS is designed to nudge the nose down, a basic recovery maneuver for all airplanes that are approaching a stall.
Link to the rest:
https://www-m.cnn.com/2019/03/11/op...index.html?r=https://www.cnn.com/search?q=737