disk loading
... that a key differentiator between rotors and propellers is disk loading?
... that a key differentiator between <a href="./Helicopter_rotor" id="mwEns" rel="mw:WikiLink" title="Helicopter rotor">rotors</a> and <a class="mw-redirect" href="./Propellers" id="mwEnw" rel="mw:WikiLink" title="Propellers">propellers</a> is <b id="mwEn0"><a href="./Disk_loading" id="mwEn4" rel="mw:WikiLink" title="Disk loading">disk loading</a></b>?