Originally Posted by Sliceback

What's the flaps blow up speed? 170 kts? Vref max's out around 145 kts? Will a sinker develop from the trailing edge flaps retracting from flaps 30 to flaps 20, while at a minimum speed of Vref+25? Sinker would be more than negated but the increased lift from the gust causing the IAS increase. There's a 3 kt change in stall speed from flaps 15 to flaps 20 (not necessarily 15 or 20 degrees...the actual flap deflections do not match the degrees indicated). There's another 3 kts from flaps 25 to flaps 30. However from flaps 20 to flaps 25 there's a 17 kts stall speed change. A LARGE part of that is due to the change from mid/T.O. leading edge position to the full leading edge droop. With the 'blown flap' retraction only the trailing edge flaps retract. So there might be roughly a total of 6 kts (?) in stall speed reduction with the blow up function? That wouldn't get triggered unless you hit Vref+25 kts? Being that low wasn't caused by the flap blow up function.