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| Mess with your minds: A wind powered craft going faster than a tail wind speed. |
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| electrodacus:
--- Quote from: IanB on September 02, 2021, 06:13:06 pm ---No. Do not go off on a tangent. Do not start introducing other topics. Compare my two sentences. Explain what is the difference between those two scenarios? --- End quote --- Please the the case b) intermediary state to understand that there is a big difference between a treadmill that is not moving relative to the ground and a powered off treadmill moved relative to the ground (powered off treadmill is your piece of paper or moving flat surface). I think case b) is a good way to explain/visualize the difference between a) treadmill and c) piece of paper |
| Labrat101:
Hi , Really interesting and cool, Yes this is totally possible ,and should work . as the subject says Mess with your mind . there are 4 forces all working together here . Plus the fan is not just a propeller . This experiment just would not work on a tread mill as in real life they ran it on a very large flat open surface without opticals . The bit were the fan started wobbling but as the wind increased it stop .. this is caused by fan tip speeds and centrifugal force which in turn stabilizes the craft and the tip air flow will be faster than wind speed . So when all the forces balance it will travel faster . These guys really went to the next level . :popcorn: |
| electrodacus:
--- Quote from: Labrat101 on September 02, 2021, 06:25:59 pm ---Hi , Really interesting and cool, Yes this is totally possible ,and should work . as the subject says Mess with your mind . there are 4 forces all working together here . Plus the fan is not just a propeller . This experiment just would not work on a tread mill as in real life they ran it on a very large flat open surface without opticals . The bit were the fan started wobbling but as the wind increased it stop .. this is caused by fan tip speeds and centrifugal force which in turn stabilizes the craft and the tip air flow will be faster than wind speed . So when all the forces balance it will travel faster . These guys really went to the next level . :popcorn: --- End quote --- Yes it seems it messes with many peoples mind. What do you mean by the fan is not just a propeller ? The experiment worked perfectly fine on a treadmill see the propeller based cart showing as moving forward on a treadmill. |
| Kleinstein:
--- Quote from: electrodacus on September 02, 2021, 06:18:03 pm --- --- Quote from: IanB on September 02, 2021, 06:13:06 pm ---No. Do not go off on a tangent. Do not start introducing other topics. Compare my two sentences. Explain what is the difference between those two scenarios? --- End quote --- Please the the case b) intermediary state to understand that there is a big difference between a treadmill that is not moving relative to the ground and a powered off treadmill moved relative to the ground (powered off treadmill is your piece of paper or moving flat surface). I think case b) is a good way to explain/visualize the difference between a) treadmill and c) piece of paper --- End quote --- Ok you introduce the case with the powerd of an pushed treadmil as a 3rd scenario. If it help you to make clear were the diffence is Ok. However I still don't see, if the powered off and manually pushed treadmill is more like the running treadmill, or more like the piece of paper pulled across the floor. The next question is, how does the vehicle know which of the 2 (or 3) cases is present and which way to go ? So there should be a difference to the vehicle, not just to your mind. |
| Labrat101:
--- Quote from: electrodacus on September 02, 2021, 06:30:29 pm --- --- Quote from: Labrat101 on September 02, 2021, 06:25:59 pm ---Hi , Really interesting and cool, Yes this is totally possible ,and should work . as the subject says Mess with your mind . there are 4 forces all working together here . Plus the fan is not just a propeller . This experiment just would not work on a tread mill as in real life they ran it on a very large flat open surface without opticals . The bit were the fan started wobbling but as the wind increased it stop .. this is caused by fan tip speeds and centrifugal force which in turn stabilizes the craft and the tip air flow will be faster than wind speed . So when all the forces balance it will travel faster . These guys really went to the next level . :popcorn: --- End quote --- Yes it seems it messes with many peoples mind. What do you mean by the fan is not just a propeller ? The experiment worked perfectly fine on a treadmill see the propeller based cart showing as moving forward on a treadmill. --- End quote --- The Fan is not just a Propeller as it has several functions in this type of setup . I was sorry that they did not use a smoker to show how the air was moving. the wind is turning the fan . that is connected to the drive wheels . that energy move it forward . the fan/Propeller starts to spin faster . The tips of the propeller are now creating a rotating vortex . Screw effect . so the air to the side of the vortex will move outwards > So the when equilibrium is reached the front should have a lower air pressure . less resistance (vacuum) the propeller is now blowing the craft . Yes there is ground resistance but it gets faster the propeller will try to tilt back and will stay . More like a gyroscope would Ballance. I see how this works but find it hard to explain exactly why . --- Quote ---The experiment worked perfectly fine on a treadmill see the propeller based cart showing as moving forward on a treadmill. --- End quote --- Yes I saw that experiment with a small model and a good wind source but it needs the distance to get all forces balanced very hard . Update whats with the treadmill . this is thinking back 100years when people thought if a Car went faster than 7mph you would get sucked out |
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