Author name: Akash Babu S L

Propulsive Efficiency (ηprop​) is the ratio of the useful work output (propulsive power) to the power available from the engine   η prop​: Propulsive Efficiency Propulsive Power: Power produced by the aircraft engine that contributes to propulsion. Available Power: Total power available from the engine, including losses.

Thermal Efficiency (ηth​) is a measure of how efficiently an aircraft engine converts the chemical energy of fuel into useful propulsive power.     Propulsive Power: The power produced by the aircraft engine that contributes to the forward motion of the aircraft Total Power: The total power generated by burning fuel, including both useful power

Specific Excess Power (SEP) represents the excess power available per unit weight of an aircraft   SEP: Specific Excess Power T: Thrust D: Drag W: Weight V: Velocity of the aircraft

Centripetal Acceleration (ac​) is the acceleration experienced by an object moving in a circular path   ac​: Centripetal Acceleration V: Velocity of the aircraft R: Radius of the curved flight path

The Washout Gradient (dw/dy​) represents the rate of twist along the wing span of an aircraft   dw/dy​: Washout Gradient CL​: Coefficient of Lift AR: Aspect Ratio of the wing

Airspeed Indicator Error (ΔV) is the error introduced by the pitot-static system in measuring the indicated airspeed of an aircraft   ΔV: Airspeed Indicator Error q: Dynamic pressure S Pitot​: Pitot tube cross-sectional area CD​: Drag coefficient of the pitot-static system W: Aircraft weight

Ground Effect Lift Increase is the additional lift experienced by an aircraft when flying close to the ground   Ground Effect Lift Increase: Unitless (as it is a ratio). b: Wing span (meters). ℎ: Altitude above ground (meters).

Wind Correction Angle is by which the aircraft must correct its heading to compensate for the effect of wind   w : it is the speed of the wind relative to the ground. VTAS​: it is the airspeed of an aircraft corrected for altitude

Specific Range is the distance an aircraft can travel per unit of fuel consumed. It is a measure of the fuel efficiency of an aircraft.   Velocity (V): it refers to the speed of the aircraft through the air. Specific Fuel Consumption (SFC): it is the amount of fuel consumed per unit of thrust

Power required is the power to overcome drag and maintain a certain velocity. This is the power that the aircraft’s engines need to produce to overcome aerodynamic resistance.   Preq​: Power required to overcome drag and maintain a certain velocity. D: Drag acting on the aircraft. V: Velocity of the aircraft.