(1) When in Configuration 1 + F, the flaps retract to 0 ° automatically at 210 kt (before the airspeed reaches VFE).
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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...
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.
Pilots usually use Flaps 1 when the weather is good for flying and if the runway used is longer than needed. Flaps 2 is used usually when headwinds are not strong enough or the runway in use is not that long for a takeoff run.
A310,A320,B747,B767,B777, B787, DC-10,MD11 needs atleast 8,000 ft of runway for safe operations.. Narrow Bodied crafts like A320 types needs 6000ft of Runway length.. International Wide Bodied flight needs atleast 10,000 ft of Runway for safe landing and 13,000 ft of Runway for take off.