quote: If you are calculating the approximate power required for a car to move at a certain speed without knowing the power required to move at ANY speed in the first place, then weight would be part of that equation...but since we already knew how much power it takes to move the car at a given speed, weight has already been factored, and therefore we can scale power, as I did. Not sure how many times I have to repeat this until you get it.
quote: so get over it and learn some basic math while you're at it.
quote: quote:Minutia it’s not. Have you ever tried to push a 4700lb vehicle?
quote: Oh that's a new one - you restate things I've said and then try to present it as what you've been saying all along. LOL Nice job, but you are still not grasping the basic functions of an electric motor and its respective speed controller.
quote: In an EV we don't want to control the speed of the motor but the torque it puts out. If the accelerator position controlled speed the vehicle would be very difficult to drive. Hence the motor controller manipulates the current by manipulating the voltage but the voltage doesn't bear any direct relationship to the accelerator position. None of this is in disagreement with what you have said I’m just trying to add a different perspective. As for load when you encounter a hill the driver must adjust the accelerator pedal to maintain speed (as you currently do in your ICE powered car) increasing the current to maintain the voltage.
quote: Actually it's not redundant, because it completely shatters the whole "full torque from zero RPM" line that the ignorant EV humpers cite as a major benefit of electric motors over gasoline engines...apparently they don't know how to launch a gasoline car to maximize its acceleration and assume that all acceleration happens off-idle...and if you launch correctly your tires will hook and you will accelerate quite nicely.
quote: I'm hardly being abusive...maybe you're just too whiny and thin-skinned.
quote: You probably spent hours writing this statement, even soliciting your asian friends for help, only to end up "not getting it".Your previous statement attempted to portray the engine accessories as requiring all or most of the torque of the engine at idle - which is false. The power steering pump, the water pump, alternator and A/C unit combined place a relatively minor parasitic load on the engine, whether it's idling or at its redline.Yes, I'm sure you thought you are brilliant for pointing out newton's 3rd law, but that is obvious that was never in question or in doubt.Torque is a force, so it is transferred rotationally along an axis. It is not "consumed". Power is consumed, and power is torque x RPM.
quote: An axle spinning at a certain RPM being driven with a fixed amount of torque can continue turning so long as the load placed on the axle does not exceed the amount of torque which is driving it...however if you increase the load on the axle without increasing the torque, the RPM will decline. Get it? That is power being consumed - the torque does not change.Go back to school.
quote: Because weight doesn’t change with speed, the drag force due to weight doesn’t change with speed.
quote: Therefore the power consumed due to weight scales linearly with velocity or is proportional to mass times velocity.
quote: The drag force due to aero drag scales with the square of velocity. Therefore the power consumed due to velocity (aero drag) scales with the cube of speed or is proportional to velocity cubed.
quote: Adding the results of the linear function and the cube function creates a third function in which mass and velocity still feature separately. That third function is NOT proportional to the square of speed. Mass times velocity is NOT a constant and so cannot be factored out along with the other constants when figuring out proportionality. I’m not wrong about this.
quote: That went straight over your head. The Tesla’s weight and tires will result in a rolling resistance of 56lb force. If you think that is insignificant to the point of being practically zero when compared to aero drag then what else can I say. Either you can’t understand or you won’t understand and neither of these makes you look good.
quote: An EV is not like one of your model aircraft and the correct terminology is Motor controller specifically so people like you won’t become confused. I posted this on the 4/16/2014 in this thread so it is what I have been saying all long.
quote: The advantage of full torque from zero is not having to have a clutch (or torque converter).The advantage is not having to have a clutch. It’s a mechanical simplification.
quote: In the case of Tesla the range of the motor is so broad that it also doesn’t need a gearbox and can make do with a single reduction ratio. A further mechanical simplification. The net result of this is lower weight better reliability and reduced cost.
quote: So if torque is not consumed and power is consumed and power is torque x RPM then really it is just RPM that is being consumed?? LOL. You’re funny.
quote: All that and you still haven’t said were torque in an idling engine is being transferred to.
quote: How does it feel Eric being bested by a “dim-witted buffoon”. Nothing in this world is free Eric not even cheap shots.