Spoiler: Changes the air flow over the car to create downforce but also creates a tremendous amount of drag due to a high pressure pocket of air between the trunk lid and spoiler. The high pressure pocket is a force acting the in opposite direction that the car is travelling therefore creating drag.
Spoilers are a popular aftermarket style and performance accessory. The primary purpose of a car lip spoiler is the visual accent, but they can improve aerodynamics, speed, handling, and fuel economy. Let's take a look at why lip spoilers are popular and figure out if they're worth the investment.
At low speeds, the downforce will be noticeable even as low as 30 mph but drag will not be significant until you start to get north of 60 mph. Watching a car with a large spoiler on a dusty track can show you how well a simple spoiler can work at low speeds.
A spoiler creates downforce relative to its size; which is to say that a larger spoiler will generate more downforce but also increase drag. Moreover, a more severe tilt, or angle of attack, on a spoiler will create more downforce and apply more pressure to the rear wheels.
In racing competitions achieving a high downforce without increasing drag is vital in order to obtain the fastest lap times. Ogab® has achieved this by taking cold air from air amplifiers which is then injected into the active diffuser plenum.
Downforce is generated at a squared rate relative to speed, so if a car doubles in speed, the amount of downforce it generates will quadruple (a car that generates 1,000 pounds of downforce at 100 mph will generate 4,000 pounds of downforce at 200 mph).
Maintaining traction: At very high speeds, above 70 miles per hour, rear spoilers act to push cars downward, giving the tires more contact with the road and increasing driver control.
At low speeds, a fixed spoiler may actually increase drag, but does little to improve the handling of the vehicle due to having little airflow over it. A retractable front spoiler can reduce the scraping of the car on curbs or other road imperfections, while still reducing drag at high speeds.
Front spoilers can absolutely help with vehicle performance. They help direct airflow under a vehicle in ways that reduce drag. Less drag means: Better performance at speed.
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It helps the vehicle's braking stability, as it is easier to apply the brakes at high speeds. Spoilers may improve fuel efficiency, especially if your car has front spoilers or air dams, as they move air around the vehicle and reduce drag.
If a spoiler is actually doing it's job and producing downforce, it will hurt mileage. Aero downforce is just lift directed downwards. when you generate lift, you are also generating something called induced drag, which will cause the car to require more horsepower to travel at the same speed.
There are many ways to increase a vehicle's downforce depending on the vehicle you have and what lengths you are willing to go through to increase its downforce. Steps you could take include installing air dams, splitters, side skirts, side vents, and racing louvers.
Purpose of hood venting and extraction: The main reasons for hood venting are to increase heat exchanger cooling (radiator), reduce engine compartment temperatures and to provide front downforce (reduced lift).
Spoiler is one of the most widely used and important aerodynamic devices in the automotive domain. Its main purpose is to “spoil” the unwanted airflow and channel the airflow in order, which helps in reducing the drag.
But did you know that there's a safety aspect to side skirts and side spoilers too, which work to improve braking stability as well? The increased downforce and traction translates for a better braking ability as well.
By reducing lift and increasing downforce, spoilers can help to reduce the drag that slows down a vehicle. This, in turn, can result in faster acceleration and higher top speeds, especially when driving at high speeds.
The downforce depends on the speed of the car. When the car is stationary, it produces 0 downforce. At 250 kph the rear wing produces over 2000 N of downforce. At max speed it produces around 7300 N of downforce.
This mass is a resistance to acceleration. So a heavy car will accelerate slower. Downforce won't affect this too much, but Drag will though! A high downforce wing tends to be draggy... but if you can make it efficient you can get more downforce out of it or reduce the drag on it.
