PatMc Posted July 31, 2012 Share Posted July 31, 2012 Have been flying the Druine Akrobat today. From upright S&L tried the rudder, both left & right - yaw, no roll nose pitched down. From inverted S&L, again both left & right - yaw then began to turn without roll but the nose didn't pitch either up or down. BTW, the Akrobat only needs a slight down elevator pressure to hold inverted & can do near axial rolls with no elevator correction. Quote Link to comment Share on other sites More sharing options...
PatMc Posted July 31, 2012 Share Posted July 31, 2012 Just had a thought - I should have tested it on the glide to see if the prop wash is a factor. Quote Link to comment Share on other sites More sharing options...
Former Member Posted August 4, 2012 Share Posted August 4, 2012 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
PatMc Posted August 4, 2012 Share Posted August 4, 2012 Andrew, it's pretty well documented why some aircraft roll with rudder & others don't. Consider why models with polyhedral turn more easily than those with straight dihedral & why a rudder only model can be rolled through 360 degrees when the rudder is yawing it the opposite way during the second 180. When it's yawing, the outer wing of a swept wing with no dihedral presents a greater span to the oncoming airflow, generates more lift which initiates a roll. In high speed aircraft this can cause inadvertent "dutch rolling" which is the reason many of them have anhedral. Quote Link to comment Share on other sites More sharing options...
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