Скачать с ютуб How a Helicopter Works - Part 3 в хорошем качестве

How a Helicopter Works - Part 3

This is the third in a series of videos where I'll create a 3d, animated model, of a helicopter. My intent with this series is to end up with a realistic 3d animation of a helicopter that I can use to show how a helicopter works. In this video I explain: Engine rotation speeds How it's possible to start the engines on a helicopter while keeping the rotors stationary Autorotation - specifically, I explain the purpose of the freewheeling unit (sprag clutch) and how this disconnects a failed engine from the drive system The purpose of doing this as an incremental build is to seek viewer feedback on this model so I can make adjustments to the design and also learn how to better explain the concepts covered in the video. Chapters 00:00 Intro 01:50 Engine Rotation Speeds 03:12 Starting the Engines With a Stationary Rotor 06:05 Autorotation and Function of the Freewheeling Unit 10:56 Computer Aided Design 14:15 Animation Techniques These are the references I used for the design parameters: A Mathematical Model of the UH-60 Helicopter, NASA Technical Memorandum 85890, K. Hilbert, 1984, https://ntrs.nasa.gov/citations/19840... Gear Tooth Stress Measurements on the UH-60A Helicopter Transmission, NASA Technical Paper 2698, F. Oswald, 1987, https://ntrs.nasa.gov/citations/19870... Summary of Drive-Train Component Technology in Helicopters, NASA Technical Memorandum 83726, G. Weldon, J. Coy, 1984, https://ntrs.nasa.gov/citations/19840... A Critical Assessment of UH-60 Main Rotor Blade Airfoil Data, NASA Technical Memorandum 103985, J. Totah, 1993, https://ntrs.nasa.gov/api/citations/1... Investigation of a Full-Scale Wide Chord Blade Rotor System in the NASA Ames 40- by 80-Foot Wind Tunnel, NASA, P. Shinoda, 2004, https://rotorcraft.arc.nasa.gov/Publi...