| General > General Technical Chat |
| Mess with your minds: A wind powered craft going faster than a tail wind speed. |
| << < (128/285) > >> |
| electrodacus:
--- Quote from: IanB on December 12, 2021, 03:52:34 am --- Again, you are trying to change the subject by making false comparisons. The claim is that the Blackbird can do what it does. Nobody is claiming you can stick a propeller on a big heavy car on the highway and achieve the same result. So your question is irrelevant. --- End quote --- Blackbird plus driver has about 300kg. That is not that far of from a lightweight car. Add a larger propeller I do not care the question is still valid. Cost is no issue. |
| Kleinstein:
--- Quote from: electrodacus on December 12, 2021, 03:45:22 am --- If you think I'm wrong please provide the "correct" equation. The one Derek provided in his video is clearly wrong as it will make bad predictions for both case A and case C sine his equation include (v-w) instead of the correct (w-v) w-wind speed v-vehicle speed. --- End quote --- The correcrt equations / explainartions were given multiple time - just read them and understand or show, were you think they are wrong. If a result is contradicting your intuition, this is no an argument to show that the equations are wrong. We do the math way to get away from the intuition. Sometimes the real world is counter-intuitive. --- Quote from: electrodacus on December 12, 2021, 03:54:59 am ---Blackbird plus driver has about 300kg. That is not that far of from a lightweight car. Add a larger propeller I do not care the question is still valid. Cost is no issue. --- End quote --- The balckbird example showed that it works, with an optimized vehicle (low friction) and relatively large prop, though not at twice the speed of the wind, but still faster than the wind. To do that starting with a normal car would need an even larger fan and may topple the car - so not really practical, but that is not the point. The point is that there are experiments that show that things are possible that are against some peopel's intuition. Just accept that intuition some-times is wrong. If in doubt the math is more reliable. |
| Brumby:
Are we back into this brick wall headbutting exercise again...? :palm: The simple fact is that the Blackbird can do what is claimed. It has been proven experimentally - except someone doesn't want to admit something than runs counter to their intuition. Many members have pointed out errors in their argument, yet they refuse to concede any of them. Stubborn and ignorant ... it's a fool's errand to try and correct them. I've not the time to waste any more on this silliness. Dunning–Kruger is strong in this one. |
| PlainName:
--- Quote ---I've not the time to waste any more on this silliness. --- End quote --- Didn't you say that some while back (in the thread you had to duplicate this in)? Surely just skipping these threads would solve all your issues. Same in all the other threads where you strongly suggest it's closed, locked or otherwise terminated when you get bored of it. |
| Brumby:
I've taken the time to add a comment regarding the futility of attempts to convince the recalcitrant involved. I'm not inclined to invest any more of my time in trying to help them understand, further than I have previously. So please - get off your high horse. |
| Navigation |
| Message Index |
| Next page |
| Previous page |