So apropos of the dialogue with the idiot Salty Dog on fraudulent hp ratings in ahr, and after some links in the other rcm thread, I did another test.
Larry moe curly said: They quit lying because of this lawsuit:
Unfortunately the cutoff date for filing was Oct. 24, 2004. -------------------------------------
Unfortunately, they apparently have not stopped lying, at least in wet-dry vacs. But inyway, Salty Dogshit, there's your cite. Read it and enjoy..... You can apologize to me later, and don't forget to thank larry moe curly.
amdx posted: Rated 6.5 peak hp, That's 40 amps at 120 Volts if you ignore inefficiency. http://www.sears.com/shc/s/p_10153_12605_00917066000P?vName=Tools&cName=Shop+Vacs+%26+Dust+Collection&sName=Wet-Dry+Vacuums
I realized that I actually had one of those units in the corner of my shop, except mine was a Rigid, also rated at 6.5 hp. 6.5 hp????? Holy shit....
So I took it apart, put a vise grip on the rotor, plugged the unit into my ampprobe adapter, put an ampprobe on it, turned on the switch, and hung on for dear life. Holy shit.... 35 amp locked rotor current!! That was surprising, given how light the motor part of the unit was.
And 9 amp running current -- more on that later.
Doing the calcs, the locked-rotor hp is 5.4 hp, not 6.5, altho there might have been some voltage drop in the cord -- 35 amps in a 16 ga cord, donchaknow.
But, factor in an 80% motor efficiency, and that drops to 4.3 locked-rotor hp -- so these muthafuckas are misrepresenting even their locked-rotor power figures!!! Figgers.....
Oh, and we haven't even put in the *power factor*, inherent in all electric motors (from inductance, capacitance), which further diminishes the hp -- proly by another 20%.
So, what IS the TRUE hp, in a wet-dry vac?
Well, it turns out, that when disassembled, vacs draw the *most* current, cuz of the least resistance to air flow -- in this case, 9 amps. If you BLOCK the air inlet, the rpm goes way up, and the current draw drops to 6 amps.
So, 9 amps is the FUNCTIONAL MAXIMUM current draw of a vac, and it proly drops to 8 amps when re-assembled, with the cannisters, filters, hoses, etc..
So the REAL operational hp of this vac is not 6.5 hp, not 5.4, and not 4.3 hp.
It is ACTUALLY 8 x 120 x .8 x .8/746 (amps x volts x motor eff x power factor/ watts per hp) which calcs out to about .8 hp. Not 8.0, but 0.8. Holy shit.....
So the FUNCTIONAL MAXIMUM HORSEPOWER of this unit is not 6.5, 5.4, 4.3, 3, 2, or 1 -- it's 0.8 hp. There is NO WAY this type of unit can generate any more than this, unless you fundamentally changed the unit by opening up ports, hoses, filters, etc.
MAYBE you can tweak the calcs to get this hp number up to 1.0. Still......
Thus, a claim of 6.5 hp is not only physically impossible on a 120 V circuit, it is a fraudulent exaggeration by 800 percent. Imagine if your effing taxes went up by 800%.
The situation for other tools may be somewhat more ambiguous, but for vacs it is CRYSTAL CLEAR, because of the nature of the current draws vs air flow: T The usable hp CANNOT get any higher than in the totally disassembled, unclogged state, which is how it was tested. Use of a vac actually REDUCES the hp requirement -- think of the above drop to 6 amps under 100% clogging, which is the least power draw of this vac.
So claiming 6.5 hp is quadruply irresponsible, gratuitous, nonsensical, and fraudulent.
No doubt, none of this is good enough for disingenuous kneejerk assholes like Salty Dog, Shitty Two, and Ricodjour, who are no doubt going to bleat Liar, Where are the cites, blah blah blah.
They are so quick to call others liars because they themselves are inveterate and incorrigible effing liars, as Ricodjour just proved in the Major score thread, with the resurrection of the Climb vs Conventional / Dual Saw topic.
So inyway, there are the numbers for a 6.5 hp wetdry vac.
Not that it's really a practical biggie -- the unit seems functional enough, altho a neighbor's wife begged me to take out of her garage -- hubby wadn't too pleased when he found out, but since sed wife has a butt crack butterfly tattoo about 1 foot square that he apparently finds perty aphrodesiacal, he didn't say much. I myself prefer the vac.....
It also has a detachable leaf-blower top -- ingenious design.
It appears that compressors are more conservatively rated as a result of the above lawsuit, but virtually all of these big-box asshole companies will lie to the fullest extent of the law.
The trick is to find the smallest bunch of lies for your consuming buck.