04-21-2021, 02:18 PM | #77141 |
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I would like to do pressure in the future but airspeed is the easiest to calibrate. Suction cup to front of car, note speed, note A/D reading. I figure it is a start with my limited ability.
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The Following User Says Thank You to NoHaveMSG For This Useful Post: | Spuds (04-21-2021) |
04-21-2021, 02:29 PM | #77142 |
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If you are saying that you calibrate it in front of the car, then put it under the car, it is still going to be inaccurate. Calibration only accounts for that specific location of the pitot tube. It will still show precise data you can compare against multiple runs, but it won't be accurate to actual airspeed.
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04-21-2021, 02:35 PM | #77143 | |
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04-21-2021, 02:47 PM | #77144 |
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Airspeed exiting the back of the car (assuming some sort of diffuser?) would be interesting data. Other than that, I would recommend pressure transducers on surfaces or strain gauges on whatever mounts for a diffuser/splitter if you have them. The biggest problem you are going to have is turbulence under the car. Idk the scale of that vs how take will affect the baseline, but be prepared for smoothing difficulties. That is one benefit of the strain gauge technique, it basically averages and damps for you.
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04-21-2021, 02:50 PM | #77145 |
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Airspeed indicator measures the difference between ram air and static airpressure. The difference in the calibrations based on location might tell you something...
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04-21-2021, 02:52 PM | #77146 | |
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Edit, this is wrong... Last edited by Spuds; 04-21-2021 at 05:01 PM. |
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04-21-2021, 02:58 PM | #77147 | |
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All good info from you and @Spuds I will likely start a build thread for my car this year even though it is pretty much built, just to document stuff like this. It may be backyard hackery but it's fun to play around with so why not.
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04-21-2021, 03:44 PM | #77148 | |
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04-21-2021, 03:47 PM | #77149 |
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You're not an ass, but actually you are wrong. See total (ram) air pressure vs static air pressure is was gives you the dynamic pressure. So when I said it compares ram air vs static I was 100% correct. If I said it measured dynamic pressure I would simply not mention the comparison (ratio).
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04-21-2021, 05:00 PM | #77150 | |
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Now I'm just a dumbass lol. But really I should have known that since that's kind of my degree... |
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04-21-2021, 05:09 PM | #77151 | |
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04-21-2021, 05:13 PM | #77152 |
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I'm in that mood today where I hate everyone and everything. That is all.
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04-21-2021, 05:19 PM | #77153 |
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04-21-2021, 05:20 PM | #77154 | |
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But...
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