10 votes
Accepted

What makes spiral instability less harmful than Dutch roll?

Because spiral instability is easier to address by the pilot than Dutch Roll tendencies. Spiral instability is instability about the longitudinal axis. For example, spiral instability means that if ...
  • 8,190
6 votes

What makes spiral instability less harmful than Dutch roll?

@Devil07 concentrated the answer on complexity of the movement (1D vs. 2D). I'll talk about the response times, which will be different between isntabilities. Typically, the response time of the ...
  • 758
2 votes

Can having too small of a roll or yaw stiffness destabilize the dutch roll mode?

To estimate whether the dutch-roll mode goes unstable, we can assess the real-part of the dutch-roll eigenvalue: negative is stable and positive is unstable. From Etkins, Dynamics of Flight, one ...
  • 10.9k
2 votes

Why is the "Dutch" roll called so?

An early use of "Dutch rolls" in aeroplaning is 1910: Fancy aeroplaning was on the programme at the Harvard Aviation Field the next day, with Ralph Johnstone and Walter Brookins as the star ...
  • 21
2 votes

Is there a regulatory maximum side slip angle for commercial aircraft?

There is no regulatory maximum for side-slip angle. There are requirements that there be sufficient lateral control in an engine out condition. § 25.147 Directional and lateral control. (a) ...
  • 18.4k
1 vote

What is the dutch roll filter? How does it work?

Yaw damper systems implemented on most transport category aircraft accomplish the task of damping the dutch-roll. The only control output needed is the rudder. Simple yaw damper system may use only ...
  • 10.9k
1 vote

What is the dutch roll filter? How does it work?

I assume you know what a dutch roll is, if not here is a brief summary: At the airplane yaws to one side the wing that is moving forward has a higher speed and creates more lift which causes the ...
  • 2,246
1 vote

How do Airbus and Boeing aircraft handle Dutch roll?

This is quite similar to the other question you asked. From my knowledge as a flight simulator enthusiast I can summarize the following: Boeing aircraft in the past used to be controlled pretty much ...
  • 2,246

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