1. Case Study – Application of Sensors in measuring torque and thrust produced by propellers in small unmanned quad-rotor helicopter

2. ??? Propeller Thrust, Torque & RPM Thrust (N) / Lift force by propeller Torque (N-m)

3. F Force Applied Spring Const. Spring Elongation

4. How to get this force in terms of electrical Signal / voltage ???

5. Strain Gauge Resistance Property of material Length of wire Effective cross sectional area of wire => Tension Compression

6. Wheatstone Bridge

7. (3)

8. Wheatstone Bridge (2)(4) (2)

9. Full Bridge Strain Gauge R R R R

10. Tension Compression No Force Applied R R R R

11. Bending Beam Load Cell Strain Gauge

12. Bending Beam Load Cell Strain Gauge In Tension Strain Gauge in compression

13. Measuring Thrust & Torque

14. Thrust Torque

15. Measuring RPM Light Sensitive Sensor LED

18. Calibration of Sensors

22. Propeller Characteristics

27. Propeller Dynamometer Demo