Originally Posted by
olster
The A380 at normal landing weight has a lower Vapp than the B737-800 at proportionally similar weight value. I always thought that the high Vapp on the -800 was due to geometry ie potential tail strike issues than the wing itself.
The Vs1g charts would tell the story from the AFM, but the FCTM manoeuver margin suggests that the speed difference is entirely dependent on the weight, and there is no difference to the factor applied between Vs1g and Vref. Simple observation to be made by a B738 driver if the relatively higher refs. were due to a change in the factor and not the weight, then your stable attitude on final would be about 4 degrees lower on the 800 compared to a B737 that doesn't have any additive, and I cannot recall any such nose-low attitude, it is almost exactly the same attitude difference as a no slat approach would be.... Just on weight alone, the difference in 1.3 Vs manoeuver margin between the 700 and 800 is 20KIAS, just due to weight