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Another deadly 737 Max control bug just found!

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raptor1956:

--- Quote from: coppercone2 on June 30, 2019, 01:57:56 am ---classic
https://tech.slashdot.org/story/19/06/29/1555243/boeing-falsified-records-of-a-new-787-that-leaked-fuel

indian contractors writing aerospace software for EIGHT dollars an hour

--- End quote ---


I used to work for IBM and when I did the workforce totaled about 400,000 worldwide with about 250K in the USA -- today IBM employs more Indians than Americans.  Hiring them in India avoids the H1b visa problems and limits and you can hire them at the prevailing Indian wage level for similar work. 

Do you use Adobe products -- check out the splash screen next time you launch a product from them.


Brian

BravoV:
-> New flaw discovered on Boeing 737 Max, sources say

Quote : "In simulator tests, government pilots discovered that a microprocessor failure could push the nose of the plane toward the ground. It is not known whether the microprocessor played a role in either crash."

Cmiiw, so the 737 Max, aerodynamically by design is unstable like fighter jets do that need "constant" corrections, in order just to fly straight ?

All this time I always assume at every civilian's plane design, that is the basic 101 when starting the plane design from the scratch, guess I'm wrong.  ::)

Kleinstein:
Like other passenger planes the 737 max is stable by itself and does not need the constant corrections from the computer. However like in many other planes there are computer systems that make the life easier to the pilots (e.g. automatic trim and auto-pilot) and some that should prevent some possible pilot errors (e.g. ground approach warning and the MACS to avoid to high an angle of attack).  If they don't work right these systems have the power to make like life of the pilot hard and possibly crash the plane.

David Hess:

--- Quote from: BravoV on June 30, 2019, 06:16:59 am ---Cmiiw, so the 737 Max, aerodynamically by design is unstable like fighter jets do that need "constant" corrections, in order just to fly straight ?

All this time I always assume at every civilian's plane design, that is the basic 101 when starting the plane design from the scratch, guess I'm wrong.  ::)
--- End quote ---

The 737 Max was not designed from scratch.  The primary objective was to modify the existing design to meet the new requirements.

I was going to say that the instability is not of the kind normally considered but that is not really the case, is it?  Moving the larger engines forward to increase ground clearance moved the center of lift *forward* of the center of gravity making the plane unstable on its pitch axis preventing passive recovery from stall.  To correct this, the wings would have needed to be moved back or the fuselage extended forward of the wings.

sokoloff:

--- Quote from: David Hess on July 01, 2019, 12:09:01 pm ---
--- Quote from: BravoV on June 30, 2019, 06:16:59 am ---Cmiiw, so the 737 Max, aerodynamically by design is unstable like fighter jets do that need "constant" corrections, in order just to fly straight ?

All this time I always assume at every civilian's plane design, that is the basic 101 when starting the plane design from the scratch, guess I'm wrong.  ::)
--- End quote ---

The 737 Max was not designed from scratch.  The primary objective was to modify the existing design to meet the new requirements.
--- End quote ---
The 737 Max is not negatively (nor neutrally) stable in pitch. What it is is "not high enough yoke force curve with high pitch and high power to meet certification requirements". In other words, it's still positively stable in pitch, but not by enough with the Max engines' power, location, and aerodynamic lift from the engine nacelles.

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