Turn Coordinator and Rate of Roll Detection
10-31-2013, 04:35 PM
#1
Gets Weekends Off
Thread Starter
Joined APC: Mar 2012
Posts: 231
Turn Coordinator and Rate of Roll Detection
Hello all,
Can someone explain to me how the TC detects Rate of Roll? I know it's because of the 30 degree canted gimbal, but does it work off precession as well? Seems like very difficult information to find.
If you have a source that goes into detail, I would love that as well. . .
Thanks!
Can someone explain to me how the TC detects Rate of Roll? I know it's because of the 30 degree canted gimbal, but does it work off precession as well? Seems like very difficult information to find.
If you have a source that goes into detail, I would love that as well. . .
Thanks!
10-31-2013, 07:26 PM
#2
Gets Weekends Off
Thread Starter
Joined APC: Mar 2012
Posts: 231
Found a patent for the TC:
Patent US3355943 - Aircraft turn coordinator - Google Patents
Appears to confirm my suspicion that it's precession that allows for this sensing. But there is no discussion of the physics of it.
Patent US3355943 - Aircraft turn coordinator - Google Patents
Appears to confirm my suspicion that it's precession that allows for this sensing. But there is no discussion of the physics of it.
10-31-2013, 09:17 PM
#3
Gets Weekends Off
Joined APC: Nov 2011
Position: Volleyball Player
Posts: 3,982
It's precession. It's just like sensing a turn, but in a different dimension. It's beneficial to have or build your own TC, if nothing else with paper/cardboard. Then you can work out the forces. A "roll" would be a force applied say to the top of the casing, to make it "roll" along the ground or whatever. Now take away the casing, apply that same force to the top of the gyro, go 90 degrees in the direction gyro of rotation, push at that location with your finger, you'll find that due to the 30 degree cant, it's free to "move" sideways when you push it there. That's what you see when you roll.
How you work through these is: "where do you apply the force", find out that, then you can usually work out the rest.
How you work through these is: "where do you apply the force", find out that, then you can usually work out the rest.
11-02-2013, 09:39 PM
#4
Gets Weekends Off
Thread Starter
Joined APC: Mar 2012
Posts: 231
Thanks, James. Your suggestion to build a TC sounds pretty cool and a good idea. I think I will do that.
Do you have an understanding of the relationship between the two precession forces acting on the gyro and how they regulate the movement of the aircraft on the face of the instrument?
I have a feeling that the precession force introduced by the canting regulates the rate the gyro tilts about the longitudinal axis.
Thanks again!!
Do you have an understanding of the relationship between the two precession forces acting on the gyro and how they regulate the movement of the aircraft on the face of the instrument?
I have a feeling that the precession force introduced by the canting regulates the rate the gyro tilts about the longitudinal axis.
Thanks again!!
