This lesson covers the concept of the Rayleigh Pitot tube and its application in drag measurement on cylindrical bodies and other two-dimensional geometries. The lesson begins with an explanation of the Rayleigh Pitot tube and its mounting in a supersonic wind tunnel. It then delves into the use of mercury manometers in high-speed applications due to their higher density. The lesson further explains the measurement of pressure changes in low-speed and high-speed tunnels. The concept of the Rayleigh Pitot tube formula is introduced, which helps in obtaining the free stream Mach number. The lesson also discusses two methods of drag measurement: the Pitot rake for performing wake survey behind the body and the direct weighing method using a mechanical balance.

- The Rayleigh Pitot tube is used for drag measurement on cylindrical bodies and other two-dimensional geometries.
- Mercury manometers are preferred for high-speed applications due to their higher density.
- The Rayleigh Pitot tube formula helps in obtaining the free stream Mach number.
- The Pitot rake method involves performing a wake survey behind the body to estimate the drag.
- The direct weighing method uses a mechanical balance for drag estimation on a cylindrical body.

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