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  1. Actually, the motors (there are three) could each...

    Actually, the motors (there are three) could each have their own VFD internally. I suspect that control is fairly complex on this machine and could involve more than simple on/off control of the...
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    You might want to look at Grizzly's published...

    You might want to look at Grizzly's published performance curve for that G0860 before you commit to it. I suspect it's wrong (surely it's not that bad?) but it's what they specify.

    Here's a plot...
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    I've seen something that looked like that. It...

    I've seen something that looked like that. It was Aluminum Chloride. The little whiskers grow when there's high humidity and a little bit of Chlorine in the air. Did you have a source of Chlorine...
  4. I must be missing something here. Why wouldn't...

    I must be missing something here. Why wouldn't this work:

    https://sawmillcreek.org/attachment.php?attachmentid=413565&d=1564687076
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    Reminds me of the David Letterman skit "Will it...

    Reminds me of the David Letterman skit "Will it Float?". If the brick sinks the water level goes down. If it floats or has neutral buoyancy the water level stays the same. The water level never...
  6. Nice work Andrew. I've plotted both your data...

    Nice work Andrew. I've plotted both your data and Grizzly's on the same graph so we can compare them:
    413160

    Some notes on the above:

    1) I used you velocity numbers without a fudge factor. ...
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    For hose couplers I've modified a standard PVC...

    For hose couplers I've modified a standard PVC coupling, when the hose is an appropriate size, by cutting a spiral groove to match the pitch of the hose wire using a rotary tool with a burr. Careful...
  8. The HF is nowhere close to yours. It has a 10...

    The HF is nowhere close to yours. It has a 10 fan, yours is 12. All else being equal the HP draw of a fan varies with the cube of diameter. On that basis you could say that the HF has less than...
  9. Oh no! You want to know what the point of all...

    Oh no! You want to know what the point of all this is.:eek: That's a great question but unfortunately a long and convoluted answer!

    Here's what it isn't. I'm not trying to help you improve your...
  10. Exactly! You cannot get the level of precision...

    Exactly! You cannot get the level of precision you are claiming.



    No, the circle between .75" and 5.25" has a diameter of 4.5". The area of a 4.5" circle is 15.9sqin or 56%.



    Correct.
  11. Ok, let's try this again. Maybe a picture will...

    Ok, let's try this again. Maybe a picture will help.

    412858

    This is a plot of your data points (plus the boundary conditions) versus area of the duct. You can see the large gaps between 0 and...
  12. Andrew, Larry's comment on testing locations is...

    Andrew, Larry's comment on testing locations is important. The area of a circle varies with the square of diameter so the test points must me located accordingly. You've sampled the inner 4 inches...
  13. These might help:...

    These might help:
    https://www.youtube.com/watch?v=NnxTbVrfb-Q
    https://www.tsi.com/getmedia/1a11d344-0a58-4ca6-94fe-65721825686b/AF-106%20Traversing%20a%20Duct?ext=.pdf...
  14. How many points in your traverse? Did you only...

    How many points in your traverse?

    Did you only traverse in one direction?

    Why did you put your test port close to a junction instead of midway between the junction and the DC?
  15. I remember that project! My dad had a...

    I remember that project! My dad had a subscription to Popular Science and I would read it cover to cover as soon as it arrived in the mail. Weren't Wordless Workshop and Smoky's Garage regular...
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    If you mean that mathematics is more fun than...

    If you mean that mathematics is more fun than hanging ductwork I couldn't agree more!

    I'd like to hear more about how you use Mathematica for this. You're not doing a full CFD simutation, are...
  17. Thank you Ole. That's an excellent photo, I can...

    Thank you Ole. That's an excellent photo, I can easily read the tag.

    I was wondering what the motor rating would be on a 3.7HP compressor. I guess a 3.7HP motor is appropriate! Wasn't really...
  18. Ole, that's a nice looking compressor. If the...

    Ole, that's a nice looking compressor. If the motor has an actual nameplate I would sure like to see a photo of it if it's not too much trouble to get to it.
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    You might want to look at the Testo 405i...

    You might want to look at the Testo 405i. With it you can make measurements in accordance with established standards. Of course these measurements are more difficult than waving a fan in front of...
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    This report...

    This report from the US Department of the Interior Bureau of Mines can help you better understand your anemometer readings.
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    Another satisfied Panasonic inverter owner here. ...

    Another satisfied Panasonic inverter owner here. We've had ours for about 3 years now. As others have pointed out the evenness of the reduced power settings is noticeable. Once the correct...
  22. Thank you Stewie. Expiration dates can be useful...

    Thank you Stewie. Expiration dates can be useful but it's hard to beat an actual freshness test.
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    Yes, that triangle will fit a 23.1" circle. But...

    Yes, that triangle will fit a 23.1" circle. But it will also fit a 19.32" square. (20" times cos(15))

    411546
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    Sticky: I can understand you not wanting to hack your new...

    I can understand you not wanting to hack your new DC just to tap into the power.



    Thanks, I think it may apply to more than just loudspeakers.:D
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    Well, you could taste it and put an end to the...

    Well, you could taste it and put an end to the speculation. You're already breathing it. :)
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