unfortunately in a capitalistic society aeronautical engineering is driven by economics rather than safety.
more more more. we want more people on board. we want more miles per gallon, the people living near the airport want less noise.
so you have bigger aircraft to squeeze more people on board, which means more fuel, which means more weight, which means gigantic engines, which means more noise, which means increased bypass ratio for less noise and better fuel economy, which means bigger blades, which means more stress, all this compounded by the trend toward fewer motors (2), even for overseas flights,
there is a bell shaped curve in my opinion of the optimal aircraft size, and that would be, oh, say, a 727 or somewhere around there.
maybe bigger. i notice that southwest has very few aircraft failure than other carriers, and that they load those planes quick, and that they are in and out of the airport easier, what model do they use? 737 right? not the max, well they just bought a bunch, so yes the max, so i think that is probably the best plane, they do short hauls mostly, which is what aircraft should be limited to in order to be more safe by limiting fuel, passengers and thus weight which means less stress. why does everybody need to fly allover the earth? can they not do a skype meeting or send an email? save the planet. save lives. have you ever seen a world map of all the airplanes in the air? it is crazy!
Every day, FAA's Air Traffic Organization (ATO) provides service to more than 45,000 flights and 2.9 million airline passengers across more than 29 million square miles of airspace. 16 million flights a year! if you tempt fate by asking that many people to defy gravity, then of course you will have incidents.
losing one motor? no big. they test those things on the bench for the exact failure that happened in coloroado. they place small charges under the blade and watch the action when the fuse is lit,
there is some randomness to the path of the projectiles which contain tremendous amounts of kinetic energy due to the speed at which they rotate, MV^2, so speed gets squared,
that P and W 4000 was designed for about 64 K thrust, using a 100 inch an. but accountants wanted more people on board each plane so it shot up to 98 K thrust with a 112" fan, seems like when they modify an engine for more thrust, there is a safe limit as to what you can squeeze out of the original compressor structure.in this case, the colorado plane was in it's climb, which is the hardest part of the flight for a motor. in fact, the heat build up is so bad that by the time that plane reaches cruising altitude, the motor is just below melting point. this drove the JT9D engineers nuts, they could not seem to gat a 747 up to 30 grand without something snapping. in fact, the chief engineer wanted to have a JT9D put on his front lawn so he could go out there every night and shoot it with a shot gun! the 4000 is patterned after the JT9D.
those fan blades are about 6 feet long, that means the tip of the blade is traveling a 38 foot circle, 2000 times a minute, which is 836 miles per hour, lets say that carbon fiber blade weighs 40 pounds, that means the blade has about 1 million foot pounds of Kinetic Energy, but divide that by 2 or more to get the average since not all parts of the blade move that fast, so that Nacelle has to contain about 500,000 foot pounds if just one blade snaps. otherwise the blade will cut through the fuselage like a knife thru soft butter. luckily the wing is located out away from the flight path of the blade and this is no accident.
since this plane was at about 10,000 feet, and things were starting to get warm due to a healthy passenger load, and since the tower told the guy to alter his course a bit, which meant revving up those stressed out motors a bit more, and since KE has velocity squared, you can see that the KE of the fan blade increased exponentially as it left it's moorings, much to the chagrin of the passengers sitting on the let side of the plane.
but losing an engine is no big deal, hell, some pilots land those aerodynamic bricks with zero engines. well, not all the time, but sometimes, with varied results.
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