41 Comments

  1. Very impressed with your workmanship and testing! I see your measuring rpms. I think you'll get more data by plugging your motor into a simple $20 'Kill-a-watt' meter. This will give you a look at motor input power, and it's a very simple addition to your teet setup.

  2. It should be desirable to make the fins thinner. Also, if they are lightweight, the balance issue is minimized. Perhaps curved sheet from cans, plastic bucket, or PVC conduit.

    If the fins must be kept relatively thick for structural reasons, at least try tapering the fins at the leading and trailing edges for minimal turbulence.

  3. Please make a video on wood shaping / cutting machines both electrical and manua

  8. three thumbs up for 3 amazing insight up till the last seconds of the video

  10. The fan would be more efficient, if, the swept areas for inlet and outlet were about the same. So, the top cover would need to be conical.
    If the blades were also aerofoil shaped that would also improve efficiency, and reduce noise.

  11. More (or even roughly the same) airflow with fewer RPM would seem to be more efficient. That’s like more miles with the same or less gasoline.

  15. In all your impeller videos I've seen so far, I never see you retest the balance after adding counterweights or shaving off material, but I assume you do actually do this, right?

  16. If you move the impeller after reshaping it to the tight side of your housing more air will be moved your fin ring become redundant after a bit of fudging

  27. This can somehow explain the direction of the cooling fins inside vehicle brake rotors, thus answering the question of how they are supposed to be installed.

  28. No entiendo un carajo el ingles, pero haces tantas pruebas y graficos…que me encantó….saludos de Lima

  29. اکثرا اهل منطق را ادمهای خشک و بی روحی ارزیابی می کنند.
    نظر من کاملا متفاوت است .
    اهل منطق کاملا منعطف هستند و این دیگران را در توهم بی مرز بودن انها می اندازد .
    نه یعنی نه !
    البته انجا هم که بحث افرینش کشتی شد می توان چند پاراگاراف افزود طوری که هیچ لامذهبی نتو اند به دین جسارت کند !
    نمیگویم رییس در خماری بماند !

  34. Actually the "backwards" running impeller is the correct way for curved vanes. It is intuitive to think the vanes should cup the fluid to better move it. The opposite is actually the better way for it to run.

  35. I bet the straight fins are faster at pumping air but easier to catch dust and needs more power and noisier.

    But the most common impeller, the backward facing are much better.

  37. I started to manufacture exhaust fans thanks to the videos on this channel. too top, speaking straight from Brazil.

  38. I assume the motor is an induction one and the lowest of the three rpm s show, forward finned is drawing the highest power, if you have a way of measuring the amount of air that is flowing out, probably for the forward finned you get the highest volume out of the three variants, just my 2c, would like to hear from others on this line of thought..

  40. Interesting! With a flowmeter, impeller capacity curves could be prepared. 🙂

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