Turn coord. Vs Turn indicator

[quigs]

I come across this the other day with a student and really found how little I knew about the turn indicator. Most of the aircraft I have flown have turn coordinators. I looked up what the FAA inst flight handbook says, but gained very little from that. Is there really any difference between the two other than one senses yaw and roll along the vertical axis? Im talking about the older turn indicator. I appreciate any advice.

 

[jaybird]

Turn Coordinator= rate of turn and rate of roll

Turn Indicator= rate of turn only

I dont know if you were looking for something more in-depth?

 

[tarp]

Turn Indicator - "Dog house" - Single needle pointing to reference points, indicates "rate of turn" only by precession around the longitudinal axis of the airplane (i.e. gyro is mounted in forre/aft design). (Edit : sorry gyro is mounted longitudinal giving information around the vertical axis.) You determine how fast you are turning as in saying 2 minute turn.

Turn Coordinator - "miniture airplane" points to "tick" marks. indicates "rate of turn" by using a 70% rate of yaw / 30% rate of bank combination. Gyro is mounted on an angle making it sensitive not only to yaw movements (nose right/nose left) but also to bank movements. (Information depicted is still "rate of turn" (combined).

In a coordinated turn, both indicators give proper information. In an uncoordinated turn, the TC is more "sensitive" and will indicate wing banking in the proper direction (where as TI needle will lag information).

And that's all I can say about that.

 

[quigs]

Thanks for the info..