Kungani izindiza ezinophephela emhlane zingakwazi ukundiza ngokushesha njengezindiza?
Ukuze indiza ikwazi ukundiza, kudingeka ikwazi ukuphakama. Ezindizeni, ukuphakama kubangelwa umoya ogeleza phezu kwamaphiko. Lapho indiza indiza ngokushesha, yilapho kukhiqizwa khona amandla aphakeme. Ngakolunye uhlangothi, ezindizeni ezinophephela emhlane, amandla okuphakamisa akhiqizwa ama-rotor blades ajikelezayo. Uma indiza enophephela emhlane ihamba, ama-blade azokhiqiza ukuphakanyiswa okukhulu ohlangothini lapho ehamba khona ngendlela indiza enophephela emhlane ehamba ngayo (iya phambili), kunohlangothini lapho ihamba khona ngendlela ephambene (iyahlehla). Lokhu kubizwa ngokuthi i-disymmetry of lift. Lapho indiza enophephela emhlane ihamba ngokushesha, yilapho lokhu kungalingani kuyoba kukhulu khona. Ijubane eliphezulu lendiza enophephela emhlane lilingana nejubane i-blade ehlehlela emuva eyayizoqala ngalo ukuma.