der v ators ▁in ▁ 1 9 3 0 , ▁tested ▁on ▁a ▁modified ▁Han ri ot ▁HD . 2 8 ▁tra iner ▁in ▁ 1 9 3 1 . ▁ ▁The ▁name ▁is ▁a ▁port man te au ▁of ▁the ▁words ▁rud der ▁and ▁elev ator . ▁In ▁a ▁conventional ▁aircraft ▁tail ▁configuration , ▁the ▁rud der ▁provides ▁y aw ▁( horizontal ) ▁control ▁and ▁the ▁elev ator ▁provides ▁pitch ▁( vertical ) ▁control . ▁ ▁Rud der v ators ▁provide ▁the ▁same ▁control ▁effect ▁as ▁conventional ▁control ▁surfaces , ▁but ▁through ▁a ▁more ▁complex ▁control ▁system ▁that ▁actu ates ▁the ▁control ▁surfaces ▁in ▁un ison . ▁Y aw ▁moving ▁the ▁nose ▁to ▁the ▁left ▁is ▁produced ▁on ▁an ▁u pr ight ▁V ▁tail ▁by ▁moving ▁the ▁ped als ▁left ▁which ▁def lect s ▁the ▁left - hand ▁rud der v ator ▁down ▁and ▁left ▁and ▁the ▁right - hand ▁rud der v ator ▁up ▁and ▁left . ▁The ▁opposite ▁produces ▁y aw ▁to ▁the ▁right . ▁P itch ▁nose ▁up ▁is ▁produced ▁by ▁moving ▁the ▁control ▁column ▁or ▁stick ▁back ▁which ▁def lect s ▁the ▁left - hand ▁rud der v ator ▁up ▁and ▁right ▁and ▁the ▁right - hand ▁rud der v ator ▁up ▁and ▁left . ▁P itch ▁nose ▁down ▁is ▁produced ▁by ▁moving ▁the ▁control ▁column ▁or ▁stick ▁forward ▁which ▁indu ces ▁the ▁opposite ▁rud der v ator ▁movements . ▁ ▁See ▁also ▁ ▁Cru c iform ▁tail ▁ ▁Pel ikan ▁tail ▁ ▁T - tail ▁ ▁T