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SSDiv6 · 05-28-2018, 01:15 PM

Chris,
I have posted on this subject in the past.

In addition to poor frontal area Cd, after the launch until the 1/8, most cars are dealing with the ground effects. Due to poor Cd, some cars are more susceptible to ground effects than others.

After the 1/8, as speed increases, if your vehicle has a good Cd, the ground effects start to cancel and aerodynamics plays a major role to stabilize the vehicle and reducing drag while accelerating.

It is one of the reasons why you may have seen some cars porpoising down the track. The cause is ground effects not canceling while the car is accelerating due to both, poor aerodynamics and also the suspension not being properly adjusted. Porpoising also increases drag on the vehicle.

05-28-2018, 01:15 PM	#3
SSDiv6 VIP Member Join Date: Feb 2003 Location: Glendale, Arizona Posts: 2,991 Likes: 693 Liked 1,457 Times in 543 Posts	Re: Real World Aerodynamics Chris, I have posted on this subject in the past. In addition to poor frontal area Cd, after the launch until the 1/8, most cars are dealing with the ground effects. Due to poor Cd, some cars are more susceptible to ground effects than others. After the 1/8, as speed increases, if your vehicle has a good Cd, the ground effects start to cancel and aerodynamics plays a major role to stabilize the vehicle and reducing drag while accelerating. It is one of the reasons why you may have seen some cars porpoising down the track. The cause is ground effects not canceling while the car is accelerating due to both, poor aerodynamics and also the suspension not being properly adjusted. Porpoising also increases drag on the vehicle.