| General > General Technical Chat |
| Vacuum Cleaner "Horsepower" |
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| coppercone2:
on a lighter note, my shop vac turned into a shot gun when I turned it on spewing acorns all over because of a squirrel stash. |
| Someone:
--- Quote from: james_s on March 22, 2020, 02:45:28 am --- --- Quote from: Cyberdragon on March 22, 2020, 12:32:17 am ---It's a device that creates airflow. There are several ways of measuring it, flow volume, static pressure, exc. --- End quote --- Sure but which one of those do you use in order to meaningfully assess the cleaning efficacy of a vacuum cleaner? The actual performance is going to depend on many factors and a vacuum cleaner optimized to deliver high flow, high static pressure or some other number may not clean any better than one with much lower numbers. You know vacuum cleaner makers would optimize for high numbers over actual cleaning ability, I don't think it would be any more useful than the amps or horsepower. --- End quote --- All hail the Airwatt: https://en.wikipedia.org/wiki/Airwatt |
| Zero999:
--- Quote from: WattsThat on March 21, 2020, 11:55:25 pm ---It’s the same kind of marketing BS that has the brewers battling it out for the biggest lie in who has the lowest carbohydrate content beer. Pure BS like “2 grams of carbs and 90 calories”. Yeah, so that’s a lot of fat or protein making up the remaining 82 calories that’s unaccounted for. Unless of course they’ve come up with a new basic food group that we haven’t heard about :popcorn: --- End quote --- Seems sensible to me. The alcohol is responsible for the remaining 82 calories. https://en.wikipedia.org/wiki/Alcoholic_drink#Food_energy |
| unknownparticle:
Similar BS to hobby air compressors marketed with outrageous HP claims! Break it down and most of them produce less than half what the makers claim, then apply a duty cycle factor and they are a joke. |
| SiliconWizard:
--- Quote from: Cyberdragon on March 21, 2020, 11:16:40 pm --- --- Quote from: amyk on March 21, 2020, 09:24:19 pm ---If you measure the DC resistance of the motor, use P = V^2/R and convert that to HP, that might be where the 4.5HP comes from. 4.5HP is around 3.4kW which gives a winding resistance of 4.2 ohms, seems about right for a low efficiency universal motor. --- End quote --- No, the fine print on the box says it's motor output. --- End quote --- Yep. Then it's either a complete lie, or the thing must be drawing so much current from mains that it would blow everything up in a second. :-DD |
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