Turn co-ordinator v Turn & Slip

[Unscheduled stopover]

Could someone tell me the differences between the turn co-ordinator and the turn and slip, the pros and cons for each and specifically the reasons why you wouldn't have a turn co-ordinator in an aerobatic aircraft.

Any comments would be appreciated.

[Field In Sight]

This seems to be a favourite on the FIC test for some reason. I got asked it anyway.

The ball does the same on both so ignore that bit.

The turn indicator shows rate/direction of yaw only.

The turn co-ordinator shows rate/direction of yaw and also shows rate/direction of roll. This is due to the gyro being slightly inclined (30 degrees from memory) and thus sensing movement about the longitudinal axis.

Benefits of the turn co-ordinator are that it is more useful for limited panel flying and can also be coupled to a wing leveler.

Benefits of a turn indicator is that it will show you the correct direction of a spin even when inverted. Don't know how useful this is to most people though :)

FIS.