737-800

[Telstar]

http://www.airliners.net/open.file/869815/M/

What are the Silver Vanes between the Vertical and horizontal Stabiliser? I saw them when I was getting onto a 200 recently that also belonged to Ryanair.

What are they? Why are they fitted? My guess is Vortex Generators.

[IFixPlanes]

Your guess is right.:ok:

Ingo

[Telstar]

But why, usually I have seen them on lift surfaces like Wings or Tail?

[IFixPlanes]

I think that these vortex generators holds the airflow on the skin so the horizontal stabilitzer can work properly even in inbord areas near the fusulage.
But now i am guessing:uhoh:

Ingo

[Wing Root]

http://www.b737.org.uk/fuselage.htm

These are to reduce elevator and elevator tab vibration during flight to increase their hinge bearing service life. It is also probable that they energise the airflow at the stagnation point at the tailcone thereby reducing drag and giving a slight performance advantage.

:ok: