The flat power example has an advantage after the flat torque example shifts into 2nd, 3rd, 4th, and 5th. I guessed low, but the example flat power curve is reasonably well matched against the example flat torque curve. Torque is nothing without rotational speed. The more power there is, the more mechanical advantage can be applied. Whether the wheels are 10's or 13's or any other size. Whether it's a big slow revving engine or a small high revving engine. The car with more power at a given vehicle speed has more positive driving force at the wheels. When you put your analysis together, here's what you will confirm: Make sure it's well labeled and bring it, along with anything interesting you learn, to design judging. Sweep different factors and keep all those experiments. Whether you use a spreadsheet, MATLAB, or another language, iterate the tool and the parameters. This is all a lot easier to do in metric units.Įspecially EV teams: Save yourselves a lot of trouble.Īs engineers, we settle disputes with math.Īll of your questions need to be answered with math.īut trust me, you can do all of this easily. Put the Corvette in 1st gear, turning 3000 rpm.Īt that RPM at full throttle, the small block can produce 315 lb-ft (flat torque curve) and 180 hp.ģx the mechanical advantage in 1st gear vs 6th, 3x the force at the tires.Īnd the Civic won't see which way it went. That's what the other five gears are for. Given fairly flat torque curves, they will be neck and neck until 60mph when the Honda has to shift into 3rd. When you give both full throttle, they accelerate at the same rate as long as they have the same power. Imagine both cars have the same weight, the same traction, the same aerodynamic drag. The Corvette is in 6th gear, turning 1000 rpm.Īt that RPM, at full throttle, the small block can produce 315 lb-ft and 60 hp at the crankshaft. The Civic is in 2nd gear, turning 3000 rpm.Īt that RPM, at full throttle, the Honda engine can produce 105 lb-ft and 60 hp at the crankshaft. Imagine a Civic and a Corvette traveling at the same speed. Thirty second explanation of power, torque, and gearing: This is a logic path for understanding straight line acceleration performance.
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