Скачать с ютуб Contra-Rotating Coaxial Propeller Drive в хорошем качестве

Contra-Rotating Coaxial Propeller Drive

Video render of a contra-rotating, coaxial drive for an airplane propeller. Modeled in Fusion 360 and animated with the Blender 3.0 Eevee render engine. update 12/17/22 There's been some discussion in the comments about the need for contra rotating propellers and why these aren't seen much in modern use. I believe the answer is that these designs were seen at the apex of piston/propeller technology in the 1940s and 1950s when manufacturers were doing everything they could to increase the performance of airplanes within the limits of the current-day tech. An advantage of contra rotation is that it eliminates torque, p-factor and gyroscopic precession effects on aircraft handling qualities. They also allow use of smaller diameter propellers than comparable single-prop aircraft. Jet engines also have these advantages and produce more thrust at a lower engine weight. There have been some comments about why I chose to animate this design instead of a planetary gear configuration. There are multiple ways to achieve contra (or counter) and this is just one of them. There's a NASA technical memorandum (NASA TM 82983) that compares different configurations. The one I animated here is a dual compound idler and is less efficient when compared to a differential planetary gearbox. It is also cheaper and easier to manufacture Here's an animation of a planetary contra rotating gear box:    • Contra rotating propellers with a pla...   There were comments that it's not possible to achieve 1:1 rotation of the inner and outer shafts with different size gears. This isn't correct. Different size gears are needed or else the drive wheel will clash with the idler gear. The ratio of pinion teeth to wheel teeth is the same for each gear set (even though the sizes are different). It's this identical ratio that allows 1:1 rotation. This is loosely based on the Rolls Royce Griffon gearbox. Check out this video posted by FlightEngineering1 at    • An Explanation Of The Rolls Royce Gri...   to see a view of an actual Griffon gearbox.