Know How... (Video)

KH 365: MultiRotor 101 - Part 2 - Prop balancing, InSpectre, and the Nebula Capsule projector.

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Want an easy-to-use tool to see how vulnerable you are to Meltdown and Spectre? Tired of "Jello" videos from your drone? Feel like building the 2018 Alien-X? Need a soda-can sized, Android-powered pico projector will full-size features? -- Padre and Jason have the answer to all of these questions on this flu-ridden episode of "Know How"!

InSpectre

  • Written in Assembly by Steve Gibson
  • Only 125k (would have been much less except he had to include a picture to make it a legit Win10 app)
  • NO INSTALLATION (Runs directly from the executable)
  • Will examine your vulnerability to both Meltdown and Spectre
  • MAY cause false positives with AV suites b/c it allows you to enable/disable protection (malware behavior)

    • Prop Balancing


    Unbalanced props are the #1 reason for "jello" video.

    • They can also cause premature wear on the multi-rotor's motors and frame
    • Not to mention that the excessive vibration can cause innacuracies in the FC's sensors

      • Spinning at a few thousand times per second can turn even a small imbalance into a major vibration

      So what we need to do is to balance the prop so that weight is as equally spread around the blades (and hub) as possible

      Tools and Materials:

      1. A prop balancer
        • The Du-Bro 499 Tru-Spin Prop Balancer
        • Level
          • Plastic Bubble Ruler
          • Tape or Sandpaper

            • Procedure:

            1. Assemble the Prop Balancer
            2. Place the prop balancer on a level surface, then level the prop balancer with your bubble ruler.
            3. Mount the prop on the beam, making sure that it's snug in the holder. Turning the prop should turn the beam and vice-versa. -- If the prop isn't properly secured, it will wobble, which will invalidate the balancing.
            4. Place the beam between the arms of the balancer, making sure that it freely turns.
            5. Spin the prop/beam assembly and watch for wobbles. If it wobbles, the prop isn't properly secured.
            6. Set the prop so that both blades are equal distances from the table surface, then release.
              • The heavier side of the prop will fall.
              • Add tape to the lighter blade, or sand the heavier blade. -- Repeat the test.
                • I prefer to add no more than 2 pieces of tape, always on the underside of the blade.
                • When you can position the prop in any position and it stays in that position, then it's balanced.
                  • It's possible that the HUB is unbalanced. If so, you'll notice that the prop tends to balance with the heavier side of the hub down.
                  • If that's the case, you can sand the heavier part of the hub.

                    • Alien-X

                    Procedure:

                    1. Power up Craft
                    2. Enter "Receiver Test" on Flight Controller
                    3. Test all inputs. Reverse channels and/or swap cables as needed
                    4. Set Subtrims
                    5. Set motor layout to "QuadCopter X"
                    6. Calibrate ACC
                    7. In "Mode" set "Self-Level" to "AUX"
                    8. In "Self-Level" set P to 30 and I to 20
                    9. Check motor rotation. Flip pairs as needed
                    10. Calibrate ESCs
                    11. Install props
                    12. Balance Center of Gravity

                      13. Syma X5c


                      Exercises

                      • Hovering above the ground effect
                      • Nose Out
                      • Circle of Death
                      • Nose In

                        • Nebula Capsule

                        • DLP 100 Lumen (30,000 hours)
                        • 854 x 480 Resolution
                        • 4 Hours Battery Life
                        • 360 Sound (has Bluetooth conenctivity)
                        • Can be controlled via a phone)
                        • Android 7.1
                        • 1 lb
                        • Input: Wireless, HDMI, USB, Bluetooth
                        • Up to 100" size (Really best around 30")
                        • AutoKeystone

                          • These show notes have been truncated due to length. For the full show notes, visit https://twit.tv/shows/know-how/episodes/365

                          Hosts: Fr. Robert Ballecer, SJ and Jason Howell

                          Sponsor:

                          • WordPress.com/knowhow

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