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rijakits wrote:
How can one calculate/computer analyze/test all different
variations efficiently before starting to cut metal (or sticking glasfibers
together....)?
You'd need one of the rather expensive packages that do computational fluid dynamics and a few years to learn how to use it. After that, you'd need a wind tunnel to verify what the package is telling you. They all make some base assumptions to simplify the calculations, and not every package makes the same assumptions. Then there is the problem of computer round off errors (a problem that Mother Nature doesn't suffer from). Even if all the initial assumptions were correct and you used it flawlessly, the computer may still give you the wrong answers.
Anyone knows a source for reports on the difference between NACA-low
pressure cooling systems versus Ram pressure systems? The real interist
thing would of course be the Drag-difference at the same cooling
results.....
Either it's all still classified, or NASA sort of gave up on this sort of testing around the end of WW2. Everything was going to jets, and there were much more expensive fish to fry. Unfortunately, this was about the time that the questions we're asking were about to be answered. Very few hombuilders have the budget or patience to make 100 variations on a duct and test them in a laboratory grade wind tunnel.
--
This is by far the hardest lesson about freedom. It goes against
instinct, and morality, to just sit back and watch people make
mistakes. We want to help them, which means control them and their
decisions, but in doing so we actually hurt them (and ourselves)."
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