▁beta ▁was ▁released ▁on ▁December ▁ 6 , ▁ 2 0 1 6 , ▁which ▁fixed ▁some ▁major ▁bugs . ▁The ▁official ▁release ▁of ▁X - Pl ane ▁ 1 1 ▁was ▁on ▁March ▁ 3 0 , ▁ 2 0 1 7 . ▁ ▁Fl ight ▁model ▁ ▁X - Pl ane ▁differenti ates ▁itself ▁from ▁other ▁sim ul ators ▁by ▁implementing ▁an ▁aer od ynamic ▁model ▁called ▁bla de ▁element ▁theory . ▁Trad itionally , ▁flight ▁sim ul ators ▁em ulate ▁the ▁real - world ▁performance ▁of ▁an ▁aircraft ▁by ▁using ▁empir ical ▁data ▁in ▁pre defined ▁lookup ▁tables ▁to ▁determine ▁aer od ynamic ▁forces ▁such ▁as ▁lift ▁or ▁drag , ▁which ▁vary ▁with ▁differ ing ▁flight ▁conditions . ▁These ▁sim ul ators ▁sufficiently ▁simulate ▁the ▁flight ▁characteristics ▁of ▁the ▁aircraft , ▁specifically ▁those ▁with ▁known ▁aer od ynamic ▁data , ▁but ▁are ▁not ▁useful ▁in ▁design ▁work , ▁and ▁do ▁not ▁predict ▁the ▁performance ▁of ▁aircraft ▁when ▁the ▁actual ▁figures ▁are ▁not ▁available . ▁ ▁Bla de ▁element ▁theory ▁impro ves ▁on ▁this ▁type ▁of ▁simulation ▁by ▁mod elling ▁the ▁forces ▁and ▁moments ▁on ▁an ▁aircraft ▁and ▁individually ▁evalu ating ▁the ▁parts ▁that ▁const itute ▁it . ▁Bla de - element ▁theory ▁and ▁other ▁computational ▁aer od ynamic ▁models ▁are ▁often ▁used ▁to ▁compute ▁aer od ynamic ▁forces ▁in ▁real ▁time ▁or ▁pre - compute ▁aer od ynamic ▁forces ▁of ▁a ▁new ▁design ▁for ▁use ▁in ▁a ▁sim ulator ▁employ ing ▁lookup ▁tables . ▁ ▁With ▁bla de ▁element ▁theory