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horse power is a horse
Murf,
I probably did very little riding on logs as we really did very little pulling them.
As to not bouncing as good now, do you mean back up? I have since loosing that back up bounce decide to wrap myself in a large soft encloser to protect me. Some call it fat, I call it insulation from bumps.
You know regardless of your experiences in a lot of this I hope you have each had a laugh or two in thinking of what has been posted or your own experiences. I wonder what our children and grandchildren have lost by not having their hands on such. Whether oxen, mules, horse or axes.
Now, some still live like Paul Bynun and Blue Babe did but not as many as grew up that way.
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horse power is a horse
Murf, the marvel of muscles versus our mechanical marvels is still difficult to grasp. The force of the horse as it leans into the traces to start a large log (2000 lb)moving for say the first 20 feet or length of the log could be 33,000 ft lbs of work in 10 seconds. Meaning the horse is actually out putting 10 or more HP in that short time. Mechanically you might need a 40 HP tractor or more to start and drag the log through the trees.
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horse power is a horse
One part of my orginal questions has not been adressed by anyone or I missed it.
Why is not a horse power which is suppose to be a measure the same between an gas engine, a hydraulic motor or and electric motor?
Now, I am baseing this upon Northern Tools cataglog which has a comparions between each. Why is a horsepower not the same with each? There should be no variance to me.
Ken T.
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horse power is a horse
kthompson, I've allways had the same question. I'm sure that my answer is wrong, but here goes. My thought has been that whatever is producing the horsepower whether it be a horse, gas engine, electric, or hydraulic could produce the given horsepower with out in the case of a horse stoping to rest, a gas engine running at it's absolute max till it destroyed it's self, or at what level of each ones max is the horsepower rated? Frank.
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horse power is a horse
I'll take a stab at the electric motor conversion. In a DC motor it's easy to calculate power as Voltage*Amps because the Voltage is constant. But in AC current you only have peak voltage for a very short time because the Voltage is sinusoidal. A more realistic value for power calculation is the root mean square or RMS Voltage which is quite a bit less than the peak-to-peak value. So the HP output of an AC motor is less than the line Voltage times Amps. Three-phase current is good for electric motors because it spreads these Voltage peaks out in time so there is less "ripple" in the signal and one of the phases is always near peak.
Dave
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horse power is a horse
"Voltage is sinusoid".
Until now, I would have thought that was a medical term.
I think everything is on a different scale because the various inventors worked at different periods of history with different languages and cultures, some in metric and some in inches and all independently of each other.
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horse power is a horse
Because "horsepower" and "power" are not the same thing at all, the resulting 'horsepower ratings' are also very different.
Horsepower is a blended or averaged term, it is the result of RPM, times Torque, and then divided by a factor, in this case 5,252.
As a result of this blending, a pair of engines, one gas, one electric, can produce very different types of "power" but still have exactly the same amount of "horsepower".
As an example, to demonstrtate this a little better, if an elctric motor runs at 1,750rpm, and produces 30 ft/lbs of torque, and a gas engine was runs at 3,500rpm, but produces only 15 ft/lbs of torque, they are both rated at 10hp. But which one do you want to put on a high load application?
It's sort of like the difference between a weed-whacker and a big bore one cylinder 4 stroke, both are rated at the same 'horsepower' but which one makes more grunt?
Best of luck.
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horse power is a horse
Not sure this will help, but horsepower is a measure of "Power", whick tecnically is the time it takes to get a unit of "work" done. "Work" is defined as force x distance, or can be translated to torque ( Force x Moment arm or ft-lbs ), or joules, etc.. When you look at the conversions in Northern tool, there are conversions between the different types of motors because the relationship between torque and time is not the same for all of them, or said a different way, they achieve maximum torque at different places on the performace curve. As Murf mentioned, they operate at different RPMs, therefore their rated torque is at different RPMs, or the time depenmdant rate at which they get work done is different. The relationship between torque and horsepower is not the same for each type of engine, or motor (they are all technically engines). They are all capable of producing the same power, but don't operate at the same efficiency doing it.
1 horsepower equals 550 foot-pounds/second. A 5 horse engine can do the same work as a 30 horse engine, but not in the same amount of time. The conversion rates in Nortehrn are a guide within a range of motors, but not a direct conversion for all engines.
Clear as mud now.
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horse power is a horse
I am not sure how much valuable stuff I have learned but I have learned some good stuff. Part of this shows how hard it is to engineer something in the field.
As to another thread about our soldiers, maybe we should ask congress to handle the horsepower issue and let our soldiers handle the war. No, it would really be a mess then.
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