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  1. Designmechman

    Aerodynamic drag spinning disc

    Hi guys, im looking for a simple formula to calculate the aerodynmaic drag on a spinning disc. The disc is basically the rotor for a mechanical centrifuge where the test tubes are hanging downwards and experience drag at 3000RPM. Any help would be very nice thanks
  2. Designmechman

    Epicyclic Gear Ratio 1:1500

    Thanks for that, what i gathered is that its too simple (the gear trains solution). What i would like to know is calculating Epicyclic Ratio of 1:1500. I looked on the net but couldnt even understand how its all done. 1) There is an input shaft horizontal 40mm dia with spiral spring mounted on...

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