Quote:
Originally Posted by Frank Lee
When the vehicle mission is considered (mostly solo tearing about on pavement) SUVs and CUVs, even if they were blessed with Cds equal to, say, Elantras (far from it) are inescapably burdened with excess frontal area.
|
You are correct Frank Lee, and you managed to use far less words to get to the point - thanks.
Quote:
Originally Posted by litesong
Whatever aerodynamic advantages you note in Caliber roof lines & rear ends are always overwhelmed by the draggy Caliber blunt front, compared to Elantra front. Repeating, the wide gap between Caliber & Elantra coefficients of drag are mostly due to the front end differences. Its a bit like the coefficients of drag for bullet shapes.
|
Absolutely wrong.
Drag happens after the highest/widest part of the vehicle, everything in front of that is air pressure build up (>250 mph), but not air compression as in supersonic traveling bullets and over 250 mph.
https://www.grc.nasa.gov/www/k-12/ai.../machrole.html
Quote:
|
As an aircraft moves through the air, the air molecules near the aircraft are disturbed and move around the aircraft. If the aircraft passes at a low speed, typically less than 250 mph, it is observed that the density of the air remains constant. For higher speeds, some of the energy of the aircraft goes into compressing the air and locally changing the density of the air. This compressibility effect alters the amount of resulting force on the aircraft since the aerodynamic force depends on the air density. The effect becomes more important as speed increases. Near and beyond the speed of sound, about 330 m/s or 760 mph at sea level, small disturbances in the flow are transmitted to other locations isentropically or with constant entropy. Sharp disturbances generate shock waves that affect both the lift and drag of the aircraft, and the flow conditions downstream of the shock wave. On this slide, we will investigate the dependence of the density change on the Mach number of the flow.
|
When we use the aerodynamic templates the front end of the car/truck is discounted. Please read up on it, it does I admit go against intuition and any feelings developed by prior experiences, it is however based on science/physics.
Aero-template sticky thread:
https://ecomodder.com/forum/showthre...ion-21952.html