The **pitch rate** of an **aircraft** is a **rate** of change of the **aircraft** orientation with respect to an inertial frame, expressed in body axes

# Category: Aircraft Design

**Where:-**

**a _{0}** is the Speed of Sound at standard Sea level = 661.478 KT

**M** is the Mach Number

**T** is the Temperature in Kelvin

**T _{0}** is the Standard sea level Temperature (288.15 Kelvin)

True Airspeed of an Aircraft is a speed Relative to the air mass through which Aircraft is Flying.

Chandan Singh

**Where:-**

**D** is the Drag

**V** is the Velocity of Aircraft

**η _{p}** is the Efficiency of Propeller

Brake horse Power (BHP) is the Power actually delivered by the engine and is therefore the capacity of the engine. The power developed in the combustion chambers of the engine is greater than the delivered power because of friction and other mechanical losses.

Chandan Singh

Vertical tail volume ratio is the relation between tail volume and wing volume. Vertical tail contributes positively for **Directional Stability. **Its SI unit is dimensionless.