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Old 04-21-2021, 02:18 PM   #77141
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Why specifically airspeed? I would think you would want to see static pressure on various surfaces more than anything else.
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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Old 04-21-2021, 02:29 PM   #77142
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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.
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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Old 04-21-2021, 02:35 PM   #77143
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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.
Yeah your right, difference in static pressure will skew it quite a bit. Maybe I just need to go back and rethink just using pressure transducers and forget airspeed.
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Old 04-21-2021, 02:47 PM   #77144
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Yeah your right, difference in static pressure will skew it quite a bit. Maybe I just need to go back and rethink just using pressure transducers and forget airspeed.
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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Old 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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Old 04-21-2021, 02:52 PM   #77146
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Airspeed indicator measures the difference between dynamic pressure and static pressure. The difference in the calibrations based on location might tell you something...

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FIFY. (Yes I know I am an ass)

Edit, this is wrong...

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Old 04-21-2021, 02:58 PM   #77147
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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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That was my initial plan, I knew the data wouldn't be clean but to the point that Spuds brought up, it may be far enough off make it difficult to correlate.

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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Old 04-21-2021, 03:44 PM   #77148
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That was my initial plan, I knew the data wouldn't be clean but to the point that Spuds brought up, it may be far enough off make it difficult to correlate.

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.
My car is basically stock but I have thread just to keep track of everything, lol. (I have had other cars much more modified so starting a thread for the car is the first thing I do)

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Old 04-21-2021, 03:47 PM   #77149
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FIFY. (Yes I know I am an ass)
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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Old 04-21-2021, 05:00 PM   #77150
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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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Doh. Yes, total pressure is static+dynamic.

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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Old 04-21-2021, 05:09 PM   #77151
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Doh. Yes, total pressure is static+dynamic.



Now I'm just a dumbass lol. But really I should have known that since that's kind of my degree...



I got a Master's in Aeronautical Science and I forgot probably 90% of it. Then again I chose to fly planes instead of some of the more involved jobs...

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Old 04-21-2021, 05:13 PM   #77152
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Old 04-21-2021, 05:19 PM   #77153
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I'm in that mood today where I hate everyone and everything. That is all.
Don't get mad, get even.

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Old 04-21-2021, 05:20 PM   #77154
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I'm in that mood today where I hate everyone and everything. That is all.
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