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Rudder isn't required or used for most flight operations. This is true of most turbojet aircraft, too.


I used to be an avionics instructor teaching maintenance type courses for the F/A-18. I have plenty of hours flying in the simulator where I would get the students to conduct navigation flights to familiarise themselves with the operation of the instruments as well as flight controls. I can confirm 100% that the rudder is barely touched once airborne. There ...


Get lots of airspeed,pitch up within ac flight envelope limits and as you approach stall speed for your configuration, push forward so that 0 G is shown on the g meter, and keep it there. As you come over the top pull out again within it's so you neo not exceed Vne,Vmo or Mmo or g limit's for your planes . A parabola for a few minutes or second depending on ...


The basic problem is that sideslip induces a cross flow over the fuselage that can increase the local negative AOA and flow disruptions beyond that already caused by the turbulence and downwash being generated by the flaps. The stabilizer surface on the "lee" side of this cross flow may get enough flow disruption to be felt in the elevator, maybe ...


There could be several reasons for such recommendation, but specifically for C172, its POH explains it as follows (section 'Normal Landing'): Steep slips with flap settings greater than 20° can cause a slight tendency for the elevator to oscillate under certain combinations of airspeed, sideslip angle, and center of gravity loadings.

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