Secondary Effect of Rudder

Secondary effect of rudder is roll.

In this lesson, we will demonstrate the secondary effect of the rudder.

Learning Points

We have seen already that when the rudder is used with the wings level, the glider yaws, and does not turn. What happens if we use the rudder on its own, without actively keeping the wings level?

When flying slowly, if the rudder is used on its own the glider yaws, rolls, and the nose goes down. At best you’ll be in a skidding turn, but the result could easily be a spin or spiral dive, with significant loss of height.

When flying more quickly and using the rudder alone, the same effect is seen, but is less marked. A look at the string shows the glider skids.
If we use the aileron and rudder together, we can make a coordinated turn, meaning there is no wing drop or skid as we turn.

Demonstration Scenario

This demonstration is in a valley, in calm conditions, flying a Standard Cirrus. This is not the way to fly! Your goal is always to fly ‘coordinated’, using matching aileron and rudder movements together.

Secondary effect of rudder

The video is best viewed in YouTube in HD in Full Screen mode, to easily see the on-screen messages and instruments during the demonstration. Use view, pause and rewind as needed to grasp the content and timing of the messages displayed, then focus on the action.

Further Reading and References

BGA Instructors’ Reference Cards: Ex 6

BGA Gliding Basics – Effects of Controls