Quote:
Originally Posted by winkosmosis
As far as the air is concerned the bubble may be a solid structure, but that doesn't mean it's shaped optimally. Following your reasoning, windshield and hood angle doesn't matter at all, because the air will always form a bubble.
Like I was saying before, most people think of raindrops as being "teardrop" shaped but the air hitting them has no reason to shape them into nice teardrops.
Are raindrops tear-shaped? USGS's Water Science for Schools site. |
*In Hucho's parlance the bubble is fully 'optimized'.He says that once you've achieved attached flow that more 'softening' doesn't necessarily reduce the drag any further.
* If you looked at the FLOW-IMAGES Photo-Gallery 3 you see that there is no really discernible 'bubble' in front of the 1974 Rabbit.
* You also mentioned Lay.If you have his work you'll notice that Cd 0.12 was achieved with the 'Rabbit' windshield as well as the 'ideal' windshield.No difference.
* Your correct about the raindrop.It's a deformable body.I never use it as an example.
* The 2.5 L/D teardrop streamline body of revolution I base the 'Template' on has the lowest Cd for a form aero-modders might be able to use as a streamlining guide on their own vehicle.In that context the 'teardrop' has great value.