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#propeller — Public Fediverse posts

Live and recent posts from across the Fediverse tagged #propeller, aggregated by home.social.

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  1. WA Police stumped by apparent heist of 8 tonnes of tugboat propellers

    Detectives are investigating the apparent theft of four enormous copper-rich tugboat propellers worth about $2 million in Western…
    #Australia #AU #Austrlia #burruppeninsula #Copper #heist #investigation #Perth #police #propeller #stolen #Theft #tugboat #wa #Woodside
    europesays.com/australia/40751/

  2. Spotted these #sycamore #seedpod #propeller 's while walking through the woods this morning.

  3. Spotted these #sycamore #seedpod #propeller 's while walking through the woods this morning.

  4. Spotted these #sycamore #seedpod #propeller 's while walking through the woods this morning.

  5. Spotted these #sycamore #seedpod #propeller 's while walking through the woods this morning.

  6. Spotted these #sycamore #seedpod #propeller 's while walking through the woods this morning.

  7. Me, grooving with a #SID #chip emulator running on a #parallax #propeller [p1] board, i had in a cupboard and forgotten about... so I thought I'd add 3 channel MIDI to the example SID code and add on a hacky band pass filter/ well, a LP + a HP filter, with what knobs + caps I had to hand.

  8. 1/3 What a gorgeous mild summer day. Hung out at the pier at 44th street, lucky to see big boat action.
    #NYC #pier #dog #run #Intrepid #battleship #floating #museum #cruise #ship #propeller

  9. 1/? What a gorgeous mild summer day. Hung out at the pier at 44th street, lucky to see big boat action.
    #NYC #pier #dog #run #Intrepid #battleship #floating #museum #cruise #ship #propeller

  10. 1/3 What a gorgeous mild summer day. Hung out at the pier at 44th street, lucky to see big boat action.
    #NYC #pier #dog #run #Intrepid #battleship #floating #museum #cruise #ship #propeller

  11. 1/3 What a gorgeous mild summer day. Hung out at the pier at 44th street, lucky to see big boat action.
    #NYC #pier #dog #run #Intrepid #battleship #floating #museum #cruise #ship #propeller

  12. 1/3 What a gorgeous mild summer day. Hung out at the pier at 44th street, lucky to see big boat action.
    #NYC #pier #dog #run #Intrepid #battleship #floating #museum #cruise #ship #propeller

  13. Germany’s icebreaker to get largest ever 360-degree propulsion system

    Germany’s icebreaker Polarstern has secured a new groundbreaking propulsion system as part of its next-generation upgrade in a…
    #NewsBeep #News #Space #Energy&Environment #Engineering #Germany #Icebreaker #Innovation #InventionsandMachines #Propeller #PropulsionSystem #research #Science #Sustainability #UK #UnitedKingdom
    newsbeep.com/uk/145409/

  14. Quietening Drones

    A drone’s noisiness is one of its major downfalls. Standard drones are obnoxiously loud and disruptive for both humans and animals, one reason that they’re not allowed in many places. This flow visualization, courtesy of the Slow Mo Guys, helps show why. The image above shows a standard off-the-shelf drone rotor. As each blade passes through the smoke, it sheds a wingtip vortex. (Note that these vortices are constantly coming off the blade, but we only see them where they intersect with the smoke.) As the blades go by, a constant stream of regularly-spaced vortices marches downstream of the rotor. This regular spacing creates the dominant acoustic frequency that we hear from the drone.

    Animation of wingtip vortices coming off a drone rotor with blades of different lengths. This causes interactions between the vortices, which helps disrupt the drone’s noise.

    To counter that, the company Wing uses a rotor with blades of different lengths (bottom image). This staggers the location of the shed vortices and causes some later vortices to spin up with their downstream neighbor. These interactions break up that regular spacing that generates the drone’s dominant acoustic frequency. Overall, that makes the drone sound quieter, likely without a large impact to the amount of lift it creates. (Image credit: The Slow Mo Guys)

    #acoustics #flowVisualization #fluidDynamics #physics #propeller #propellerVortex #science #wingtipVortices