What is Horsepower and Torque?

This video is very much comprehensive thanks a ton for the stuff :)))))))))))

This is the clearest description I have found so far for torque versus HP. Thank you :)

The rock looked retard....

I have a question and I have a difficulties to put this question correctly. I'm gonna try.
If my car has max torque at 1900rpm (turbo diesel engine) and max power at 4000rpm, my turbo is pulling the best from 2500-3000rpm and then it loses acceleration appreciably.

 What is the point of max power at 4000rpm or torque at 1900rpm if I can't sense neither of those?

Am I the only one that notices that in the example of lifting the rock, the engine produces a force of 200 LBS upwards and the rock produces a gravity pull of 200 LBS downwards the forces are equal and nothing would move at all???? The only difference it would make is that the ground woudnt have to support the rock anymore.

At the end, I almost went deaf, and received the fright of my life.

So how low and high torque affects car on flat surface?

I'm trying to learn about torque and you out that face on the rock hahahaha

Torque is a measure of the force exerted about an axis, Horsepower is a measure of work done per unit of time.
In everyday example, Torque is the grunt to get you going, and horsepower is 'top end', it's also the difference between winding that bitch out and hauling ass like a young kid, or as you grow older, you prefer torque, as you can accelerate and move around traffic without having to downshift, and that is a real plus with a 'safety concerned' female next to you, bc they go by what the engine sounds like... you could be doing 60, but if the engine is winding, they get the impression you are 'speeding' and blah, blah, blah.... On the other hand, with torque, you can cruise pretty quick, and move around traffic without having to downshift and wind out the engine, and your passenger is none the wiser, and everybody's happy. :)

Bonus Credit: How high does the engine fly up in the air when struck by the rock coming up at it at 16.6 ft/sec?

I think we only need to see torque in real life, horsepower should be retired for good..perhaps see torque figures per unit time....that will be enough to measure the muscle of an engine

A++++

What happens around 2:20 for example, if the weight was 205 lbs?
Would the motor stall or would it just slow down and take a couple of seconds longer to lift it to the top?

i kinda want to hear an explanation on 90s dohc honda motors the example is a 1.8 liter engine turbocharged fully built 700whp range but torque is somewhere around 400-450 ,i know those older honda engine are totally not known for torque i just want to hear the science behind it

fuck you my mind got fucked watching this

Let's check the model in the video using METRIC UNITS and make some conclusion:

Motor torque: 200 foot pound = 271.16 newton meter
Rotational speed: 1000 RPM = 104.72 radian/second
Rock mass: 200 pound = 90.718 kg
Pulley radius: 1 foot = 0.3048 meter
Lifting height: 6283 foot = 1,915 meter

Now...what???

Well...I need to deal with the ROPE'S FORCE that is pulling up the MASS of the rock against the GRAVITY FORCE that is pulling the rock downwards. Newton came up with a law about MOTION that is expressed by the formula F = m*a, where "F" is the force on a mass "m" causing an acceleration "a". From this formula you can also say that a = F/m. More force means faster acceleration and more mass means slower acceleration (as acceleration is force divided by mass).
In other words, the rock will not be able to instantly get to any speed but will have to ACCELERATE.

Let's call the force of the rope "Fr" and the force on the rock from gravity "Fg".
Since torque is "force times arm (radius)" we can derive that the rope's pulling force is:

Fr = t / r = 271.16/0.3048 = 889.6 Newton

And the force of gravity on the rock is derived from Newton's law of motion involving the acceleration of dropping objects on planet earth g = 9.80665 m/s2 (standard gravity).

Fg = m * g = 90.718 * 9.80665 = 889.6 Newton

The effective force on the rock is therefore:

Fe = Fr - Fg = 889.6 - 889. 6 = ZERO Newton => NO ACCELERATION = NO MOTION

In other words, the ROCK WILL NOT MOVE AT ALL.

Then comes the actual engine speed being 1000 RPM causing a rope speed of 2 * Pi * radius * 1000 / 60 = 31.92 meters per second, 115km per hour or 71 miles per hour. That's freaking fast!

Hey, this engine needs a clutch to engage the load in some controlled way to get to that fast of a speed without stalling. But a clutch wont be enough to generate enough pulling force to overcome gravity and get the rock moving as described above. You also need a transmission that can help get the rope pulling force substantially above gravity. And there you go...as simple as this description is...in actuality it demonstrates why we need a transmission and clutch. And the actual lifting time entirely depends on how effective those components will be much like what defines a fast accelerating car.

Alright, let's assume that the rock gets to its 115km/h or 71mph speed through some sort of CVT type transmission and clutch. And let's assume we don't slow it down at the top using the engine. In reality this means the rock will have gained some energy both in terms of KINETIC ENERGY "Ek" (motion) and POTENTIAL ENERGY "Ep" (against gravitation at the height "h"):

Ek = m * v * v / 2 = 90.718 * 31.92 * 31.92 / 2 = 46216 Joules
Ep = m * g * h = 90.718 * 9.80665 * 1915 = 1703660 Joules
Et = Ek + Ep = 1749876 Joules

If we assume we have some magic transmission that allows the 38 horsepower "P" to be effective at all time, the travel time is minimum:

Time = Et / P = 1749876 / (38 * 745.7)= 61.8 seconds

So, yes, the theoretical best case travel time is more than 60 seconds and if you add air drag and transmission efficiency into the equation, it gets much worse. But this can't be calculated without knowing details about the rock's shape and the transmissions characteristics. This is somewhat like doing a car race up a hill.

And before anyone try to replicate this, realize that the almost 2km of rope will mess everything up.

Can you do it without the retarded units please?

cool video. Thanks for making it.

but how come some engines have a much lower torque than horsepower?

best video easy explanation