Originally Posted by
neville_nobody
The Max 9 is listed at 74.3T so it will be somewhere close to that I would assume.
...
Personally I suspect this thing will be coming in like the Space Shuttle unless there is some aerodynamic changes they can sneak in there.
Well, in order to reduce the stall speed (thus Vref and approach speed) they have 2 ways to do it (they can use one or both methods), but with subsequent structural stresses and weight penalties:
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.