What is the speed of flap auto retraction on a321?
The real Airbus has this neat auto flap retraction function that automatically retracts the flaps at 210kts so if the flaps are not retracted at this speed and in config 1+F it will auto retract it before VFE...
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(1) When in Configuration 1 + F, the flaps retract to 0 ° automatically at 210 kt (before the airspeed reaches VFE).
Airbus aircrafts in general have five flap configurations (0, 1, 2, 3, FULL), which engages both the slats (front of the wing) and flaps (behind the wing).
The A320 and A321 have the same wingspan (35.8m), but the A321 has a higher wing area, and consequently a lower aspect ratio (10 compared to the A320's 10.3). Another physical difference that can be noted is that the A321 has double slotted flaps versus the single slotted flaps on other A320 family aircraft.
The A320 will descend around 2500-3000 fpm in open descent mode. You can control this by changing the airspeed you are descending at. Faster airspeed will increase descent rate and slower will decrease it, in open descent mode.