Timeline for Are taller landing gear bad for aircraft, particulary large airliners?
Current License: CC BY-SA 4.0
7 events
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| Mar 26, 2019 at 2:39 | comment | added | reirab | @alephzero True, but the MAX was designed for only one engine. They switched from the CFM56 to the CFM LEAP, just like the A320. The only real difference is that the nacelle has a flattened area on the bottom on the 737 (on both the MAX and the NGs) due to the low ground clearance on the 737. The 737 was originally designed for turbojet engines, which don't have anywhere near the diameter of modern high-bypass turbofans. | |
| Mar 26, 2019 at 2:36 | comment | added | reirab | @RobertDiGiovanni The system isn't designed to fly the plane with it. It's designed to activate as the AoA nears critical to prevent stall, just like the almost identical system on every Airbus since the A320. | |
| Mar 25, 2019 at 23:56 | comment | added | Robert DiGiovanni | @reirab if the flat bottom of the nacelles leads to pitch up at high AOA this can be solved by adding area to the H stab, just like they did with the canarded Ascender years ago. I cringed when the MD-11 downsized theirs. A big one adds safety, and offers an option other than trying to fly the plane with a rapidly pitching trim function. | |
| Mar 25, 2019 at 20:24 | comment | added | alephzero | Changing the engine can be a very big deal if it affects the wing's flutter stability margin. Boeing had a terrible time trying the design the original B747 wing to be compatible with engines from the three manufacturers, with maximum commonality of parts. | |
| Mar 25, 2019 at 18:32 | comment | added | reirab | @CrossRoads The engines on the 737 MAX aren't that much farther forward than on the NGs. They are higher, but not much farther forward at all. This is an NG (-800) and this is a MAX 8. There's currently a lot of misinformation and speculation spreading around in regards to the MAX, though. That's why we ban accident speculation here and wait for the official reports. | |
| Mar 25, 2019 at 18:21 | comment | added | reirab | @CrossRoads It's the flat bottom on the nacelle that led to the pitch-up moment at high AoA. Having the weight of the engines farther forward would result in a pitch down moment. | |
| Mar 25, 2019 at 13:15 | history | answered | MikeY | CC BY-SA 4.0 |
