▁corners ▁of ▁the ▁r hom bo id ▁push ▁out . ▁They ▁push ▁on ▁two ▁c ran ks / fly w he els ▁which ▁cause ▁them ▁to ▁rotate , ▁each ▁in ▁opposite ▁directions . ▁As ▁the ▁whe els ▁rotate ▁the ▁rh omb us ▁progress es ▁its ▁change ▁of ▁shape ▁from ▁being ▁fl atten ed ▁in ▁the ▁direction ▁of ▁the ▁p ist on ▁axis ▁at ▁top ▁dead ▁centre ▁to ▁being ▁fl atten ed ▁in ▁the ▁per pend icular ▁direction ▁to ▁the ▁p ist on ▁axis ▁at ▁bottom ▁dead ▁centre . ▁ ▁In ▁the ▁p ict ured ▁example ▁the ▁left ▁c rank / fly w heel ▁turns ▁clock wise ▁and ▁the ▁right ▁c rank / fly w heel ▁ant ic lock wise . ▁ ▁They ▁turn ▁at ▁the ▁same ▁angular ▁velocity ▁and ▁this ▁can ▁be ▁rein for ced ▁by ▁inter mes hing ▁them ▁as ▁g ear ▁whe els . ▁ ▁References ▁ ▁Mechan ical ▁D riv es ▁for ▁St ir ling ▁Eng ines ▁Dr . ▁Sieg fried ▁" Z ig " ▁Herzog , ▁Ass istant ▁Professor ▁of ▁Mechan ical ▁Engineering , ▁P enn ▁State ▁University ▁at ▁Mont ▁Al to . ▁ 0 6 / 0 1 / 0 5 ▁ ▁Access ed ▁August ▁ 2 0 0 7 ▁ ▁See ▁also ▁ ▁Category : P ist on ▁engines ▁Category : Engine ▁technology ▁Category : Link ages ▁( me chan ical ) <0x0A> </s> ▁K inc ard ine ▁( ▁; ▁) ▁or ▁K inc ard ine - on - F orth ▁is ▁a ▁small ▁town ▁on ▁the