TWiT Throwback (Video)

Know How... 168: Geared Turbofan, WinDroid, & Google History

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Pratt & Whitney's new Super Engine

  • Modern aircraft are all about the turbofan engine
  • The Turbofan combines massive amounts of power, with decent efficiency and impressive reliability.
  • Even the non-exotics are amazing works of engineering

    • Here's how a traditional turbofan works:

    • A Jet engine compresses air, adds fuel, burns it, then is thrusted forward by the expansion of exhaust gasses
    • A "Fan" moves huge amounts of air, thrusting itself forward (Think of the props on a Quadcopter)
    • A Turbofan combines the two: a HUGE fan in front of, and drive by a jet engine

      • In a modern high-bypass turbofan you have:

      1. The Fan
      2. The low-pressure compressor
      3. The High pressure compressor
      4. The Combustion chamber
      5. High pressure turbine
      6. Low pressure turbine

        7. Here's the key

        • The low pressure turbine is connected by a shaft to the low pressure compressor and fan
        • The high pressure turbine is connected to the high-pressure compressor
          • So, as the gasses and burned and expanded, they provide the power to the fan and compressors that allow for the gasses to be burned and expanded.

            • This is a good system... but the folks at Pratt and Whitney just made it obsolete!

            The Pratt & Whitney "PurePower" Geared Turbofan

            • They burn 16% less fuel for the same thrust
            • They put out less NOX for the same thrust
            • The create 75% less noise while on the ground
            • It cost 30 years and $10 billion to make them work

              • Why is it so much better?

              • Let's talk about propellors.
                • Small props that spin quickly, vs large props that spin slowly
                • Large is more efficient, and less noisy
                  • But we wouldn't use larger fans on Turbofans because the speeds as which you needed to spin the shaft for the compressors was spinning too fast for the ideal-sized fan.
                  • So... P&W added a gear box (It's 20 inches in diameter and weighs 250lbs)

                    • They used a orbital gear design to step down the speed of the low-pressure turbine/compressor shaft.

                    • This allows the fan to spin much more slowly, but with far more torque
                    • Slower speeds with more torque means they can use a more aggressive fan that moves more air at lower speeds.
                      • While a traditional turbofan might have a 5:1 bypass... PurePower does 12:1

                        • So... more efficient, more thorough burn (less pollutants), and MUCH quieter on the ground.

                        WinDroid & Google History

                        AMIDuOS!

                        • Created by AMI - "American Megatrends - The company that so many of us know from their BIOS days"
                        • They were founded in 1985 by Pat Sarma and S. Shankar (who will be on Triangulation in the future)
                        • Their first customer was "PC's Limited" which became "Dell Computers"

                          • But this is DuOS...

                          • Unlike "Bluestacks" which is an Android App Emulator, DuOS is full-Android in either a VM or a Container
                          • It gives FULL access to all the major peripherals (this was a major problem with emulators)
                            • Keyboard, Mouse, touchscreen, microphone, ambient light sensor, accelerometers, compass, orientation, etc.
                            • It also supposed variable screen sizes.

                              • Notes:

                              1. There are two versions: AMIDuOS 1.1 (Running Android Jellybean) and AMIDuOS 2.0 (Running Android Lollipop)
                              2. Jellybean will cost you $10 // Lollipop will cost $15
                              3. Once you install, you WILL need to install Google Apps and Services

                                4. Let's talk about what Google stores in your online history

                                1. Websites
                                2. Voice Commands/Searches
                                3. Connected Devices
                                4. Location History
                                5. YouTube Video History
                                6. YouTube Search History
                                  7. Feedback

                                  M

                                  These show notes have been truncated due to length. For the full show notes, visit https://twit.tv/shows/know-how/episodes/168

                                  Hosts: Fr. Robert Ballecer, SJ and Bryan Burnett

                                  Sponsors:

                                  • lynda.com/knowhow
                                  • holhom.com/twit

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                                    TWiT Throwback (Video)By TWiT