Machines | Center of Pressure & Center of Gravity - Car Design
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What is the center of pressure? Why is the center of pressure important? How do you alter where the center of pressure is located? In order to have a somewhat neutrally handling vehicle, it is ideal to have the center of pressure and the center of gravity on top of one another. If the center of pressure is too far back, the car will understeer. If the center of pressure is too far forward, the car will oversteer. Related Videos: Diffusers - http://youtu.be/3DIJMLrGz8Q Diffusers 2 - http://youtu.be/gvDerbIU-uY Race Car Aero - https://youtu.be/QA6AtmX20pI Nissan LMP1 Car - https://youtu.be/CKerNGiERTs Please feel free to rate, comment, and subscribe! And don't forget to check out my Facebook page: http://www.facebook.com/engineeringexplained To help create more videos, check out my Patreon page! http://www.patreon.com/engineeringexplained Also check out my official website: Make suggestions, learn through logically ordered lessons, read FAQs, and plan your future! http://www.howdoesacarwork.com Also on Twitter: http://www.twitter.com/jasonfenske13 NEW VIDEO EVERY WEDNESDAY!
Comments
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aside from a very curvy very small track where aero forces are always light, this seems to imply that all race cars are foolish if the engine is mid or rear mounted. a front engine car is more likely to have the cp aft of the cg. i have heard the analogy of the arrow and tail feathers mentioned for the subject.
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Sorry, there's something wrong there. Nissan should have had the center of pressure just above the front wheels because it has steering and traction on them, that would be the best that they could have had from their configuration. It would never have good performance in medium and slow speed corners anyway.
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Typically you are spot on for not simple explanations; however, as far as car bottom aero loads go the diffuser is NOT where peak pressure drop is. It never will be. The diffuser simply gives that low pressure/high velocity air a place to slow down to normal pressure and velocity. As you know, when air is moving slower pressure is higher, thus the pressure in the diffuser area will be higher than further toward the front. This is a common misconception due to the misunderstanding of the behavior of fluids.
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How do you find the center of pressure and center of gravity?
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Some interesting related history can be found in the Chaparral 2J and Brabham BT46B. Both of these cars incorporated fans to create a vacuum underneath the car. Fans as air movers, not "fans" as in spectators :)
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Good job man
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How much time do you spend drawing/writing on the board?
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I enjoy your videos very much and have learned a lot from you. I would like to see a behind the scenes video of you drawing up your whiteboard.
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what a bad ass
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Good! (Y)
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man, you need to work on your drawing.. ^_^
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I'd like to offer a (minor) rebuttal to your vid. You mentioned that the position of the COP vector may change with speed, but the magnitude of this vector will certainly change with speed. The magnitude of the COG vector will never change, so what you have is the sum of a constant vector, and a vector which changes with speed. So the correction I'd make to the video is that COG in front of COP = more prone to understeer the faster you go. Likewise, COP in front of COG = more prone to oversteer the faster you go. COP on COG = constant handling characteristics (could be understeer/oversteer/ or hopefully a nice 50/50 distribution)
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Hi! Could you do a video on different chassis? cheers.. :)
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Make a video about on how to drive a stick shift. And show the difference and advantages of picking diesel car over a gasoling car!!! Show more vid. More emphasis on highlights. More editing!!!!
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When do they pick the person for that top gear spot?
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Um how about putting up a spoiler or wing on the middle of the roof?? it will create necessary downforce at the middle of the car and thus cop could be same of cog maybe. i mean it fits the purpose you explained.
i'm pretty sure there's some limitation or something for doing that. it just a idea. -
What about staggering the ride height from a lower front to a higher rear? It helps a great deal if the underside of the vehicle is flat. This is done on formula 1 cars (just look at any race). Also, I saw a rep from McClaren state that ,on the new 675 model, the rear is set 40mm higher than the front for the purpose of shifting the center of pressure forward. The Gran Turismo 6 video game even has this feature.
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Is there any point to spoilers and wings that come stock on a lot of cars? I.E. 2005 Mustang GT (mine), Charger, Camry. They seems way to flat and horizontal that they look ineffective.
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Damn, your channel has been growing really fast. I've been subbed since ~20,000 subs. And now you have over 300,000. Congrats.
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Excelent video, I just did an experiment on this myself at an NCM track day. I'd argue that a slightly aft center of pressure would be better than centered. The car would turn in sharper(loose) at lower speeds then become more stable(understeer) at high speeds. That is how I setup the aero on my firebird anyways.