737-800 Landing Speed
I doubt to be honest. The A321 for example is not known for very high approach speeds, despite higher overall weights. Flap design (with multiple slots as on the A321) can make a difference. MTOW is not really an indicator here. The maximum landing weight needs to be known.
How much more can they do before they lose the type-rating? If you are talking redesigning flap systems what relationship is that to the certificate? I am assuming they can't add any more stages of flaps so it's only a few aerodynamic tweaks and how much difference will that make? Personally I suspect this thing will be coming in like the Space Shuttle unless there is some aerodynamic changes they can sneak in there.
How much more can they do before they lose the type-rating? If you are talking redesigning flap systems what relationship is that to the certificate?
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1. Increase the maximum CL for landing flaps only (not for the design airfoils as that will negatively affect the cruise performance) by implementing a blown flap (using engine bleed) and/or increase the number of fowler flap slots (yet that increases maintenance costs as it happens with the Classics) and/or increases the wing's aspect ratio (by increasing the wingspan only), which reduces the wing loading.
2. Reduce only the wing loading by either increasing the chords lengths alone (but this reduces the maximum CL by some amount) or simply increase the wing as a whole without affecting it's aspect ratio.
So, most probably as it is right now, the MAX will require a bit longer runways due to higher touchdown and approach speeds in comparison to the NG.
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Regards!