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Old 08-26-2020, 10:38 AM   #5 (permalink)
aerohead
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Quote:
Originally Posted by JulianEdgar View Post
Just popping in for a quick look and some comments.

1) I don't understand the point of the tool - how does it help people actually achieve anything?

2) There seems to be a lot of oversimplification happening here - eg "Since drag is directly related to fineness-ratio". No, that's not the case on any real-world car.

3) You say: "The fun begins when trying to figure how one shape beats another." I am afraid I think that is just rubbish.
Thanks,
1) It may take until you've completed your 3rd year of mechanical engineering studies, when you'e completed fluid mechanics before you understand. $ 75,000 ( US ) ought to get you there.
2) If you'll ask your world-class aerodynamicists for assistance, they ought to be able to walk you through Hucho's text, especially the part where fineness ratio is probably the single-most important criteria for the drag coefficient, and has been well established with empirical testing in the real world since 1922.
3) You can take 25 different homes, of identical size, built on the same street, by 25-different builders, maintained at identical indoor temperatures, year-round, exposed to the same weather, yet yield 25-different energy bills each month. This would be a direct analog for what the L/ square-root of Af offers.
Perspicacity is the game.
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