Originally Posted by
Verdell
I did my first flaps 25 landing in 717 a few days ago. Captain did his first on his leg as well. Both landings were some of the smoothest we had in some time. Maybe because we were trying so hard to not screw it up?
As for brake wear... VAPP is not much higher than flaps 40. There's not THAT much extra energy to dissapate before a turnoff. That said, I do think the biggest difference in braking required comes down to how much longer it takes to get the nosewheel down (thus reversers deployed). The higher pitch attitude does require an extra second or 2 before the nosewheel comes down without slamming it down.
140 knots at 90,000 lbs (making numbers up, feel free to insert real ones but convert to SI units) =
105,813,216 joules.
145 knots at 90,000 lbs = 113,562,811 joules
A 5 knot increase in speed in this example is a 7.3% increase in kinetic energy to dissipate. The speeds are the most important thing. Even assuming a mass of 1 kg, a 3.6% increase in speed increases energy 7.3%.