Question about dutch roll.
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Originally Posted by Basil
I am not disputing that you may be able to prove, in theory, that a straight wing aircraft will dutch roll however I have never flown one which does so at the flight levels normally occupied by straight wing aircraft, i.e. not Starfighter etc which had another set of roll/pitch problems.
Haven't flown either.
Do they have a yaw/roll couple PROBLEM as opposed to exhibiting a tendency?
Getting back to swept wings, the B757 could exhibit a slight tendency to a roll cycle on approach (about 1 cps) which we put down to PIO.
Edited to say: M(F)S please don't think I am challenging your aerodynamic knowledge. I was probably incorrect to state <<Straight wing aircraft do not suffer from dutch roll>> but I have never flown nor heard of a straight wing aircraft going into service which suffered from dutch roll to the extent of the early swept wing aircraft of the B707 era.
Do they have a yaw/roll couple PROBLEM as opposed to exhibiting a tendency?
Getting back to swept wings, the B757 could exhibit a slight tendency to a roll cycle on approach (about 1 cps) which we put down to PIO.
Edited to say: M(F)S please don't think I am challenging your aerodynamic knowledge. I was probably incorrect to state <<Straight wing aircraft do not suffer from dutch roll>> but I have never flown nor heard of a straight wing aircraft going into service which suffered from dutch roll to the extent of the early swept wing aircraft of the B707 era.
Last edited by Basil; 17th Jul 2006 at 20:14.
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I have been following this discussion for a while now. Without doubt, I follow it with interest but the more I read the more I come to the conclution that there is perhaps no simple explanation to the 'dutch roll question'. Not without a deep analysis of all aspects that affect an aircraft during a sideslip. I don't feel my aerodynamic knowledge is sufficent for such an analysis but I find your's most interesting. 
