国外航校私照飞行员地面课Lesson7方案.pptx

Sierra Academy of Aeronautics PPL Ground WB/Performance Lesson 7 V speeds Weight and Balance Some sample problems Performance Introduction Performance Charts Today’s Topics Vso – Stalling speed, landing configuration Vs – Stalling speed, cruise configuration Vx – Best angle of climb Vy – Best rate of climb V-speed Definitions Vrotate – Speed you raise the nose on takeoff Vbest glide – Least descent per distance traveled, engine failure speed Vfe – Maximum flap extended speed Vno – Maximum structural cruising speed Don’t exceed except in smooth air with caution Vne – Never exceed speed V-speed Definitions Va – Maneuvering Speed V- speed Definition Performance Standard Pressure 29.92” Standard Temperature 15?C Standard Atmosphere Indicated Altitude Calibrated Altitude Pressure Altitude True Altitude Absolute Altitude Altitude Types Indicated Altitude Read off altimeter Calibrated Altitude Corrected for instrument error Ignore for single engine cessnas Indicated and Calibrated Altitude Used for performance calculations Height above the Standard Datum Plane Where the pressure is 29.92” and 14.7 psi Two ways to calculate Set an Altimeter to 29.92” Mathematically find a correction factor Pressure Altitude (Standard Pressure-Current Alt Setting) x 1,000 If alt. setting: 30.12 Ind. Alt. 3000’ Example (29.92-30.12) x 1,000 = -.20 x 1,000 = -200’ Add -200 feet to indicated altitude 3,000-200=2,800 Mathematically find Pressure Alt. Pressure altitude corrected for nonstandard temperature How the airplane performs compared to standard day Used to compute performance Calculated On E6-B Table Density Altitude High density altitude = less performance Propeller less effective Wings produce less lift Engine produces less power Density Altitudes effect on aircraft Pressure Temperature Humidity Factors that Effect Density Alt Pressure Alt 3,000 Temperature 21°C Density Alt ? Density Altitude Example Vertical distance above mean sea level (MSL) Calculated on E6-B Example Te