Posted on 02/06/2017 6:55:13 PM PST by E. Pluribus Unum
In other words, you didn’t read the article because you don’t want facts interfering with your Brady-hate.
The Russians directed by Kraft and Trump hacked Matt Ryan’s helmet. This caused him to call 2 pass plays when they were in field goal range to win. These are not our super bowl winners. This injustice must be overturned.
I never watch football. I love it when the fakestream press is foiled.
He wasn’t obligated to provide the phone. The NFL had no rights to it at all.
The NFL also both stated they didn’t want the phone, and confirmed they had every single one of the relevant texts they sought...from the phones they did have the rights to: the team *issued* phones carried by the equipment manager and the ball boy.
What the CBA does have is a procedure where before punishment the player must have a hearing on specificity stated rules violation, and then has the right of appeal. To this day, Brady has still not had said hearing - which is part of why the NFL was playing games in evading saying what precisely he was being punished for, and what punishment pertained to what.
During the whole investigation and hearing process, the NFL never even argued they had any such right.
They were just throwing spaghetti against the wall.
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I agree fully.
Deflategate was absurd from every angle.
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You must be Shepard Smith.
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If the NFL really cared so much about consistent inflation, they would use nitrogen to inflate the balls. Nitrogen is much less susceptible to changing pressure when temps change. The pressure would remain stable at room temp as at 32F.
Trolling? Because that’s not even a little bit true.
If they cared about consistent inflation, they’d measure the balls on the field before the game. CO2, N2, and O2 do not notably differ from each other in their pressure response to temperature. Their difference from Helium, which is closest to an ‘ideal gas’, is far smaller than is relevant to this issue.
Here’s the equation as initially worked out with air, and then later confirmed as the specific gas not mattering:
P1*T2/T1 = P2, where temperature and pressure use an absolute scale. That’s it. Add 14.7 PSI to gauge pressure, and 460 to F to convert into the needed units.
So the natural variation in pressure of footballs in NFL games from temperature alone is nearly 6 PSI.
The footballs being wet has an additional effect which fully explains the variation amongst the footballs in the game (with or without realizing that 12-2 is not 11).
This whole thing was silly.
It didn’t. Natural variation is about 6 PSI...and no one cared. Even the QBs crying on TV didn’t seem to notice the balls were 3-4 PSI low in games they’d played in. The rules aren’t even rules in the normal sense, but rather instructions for the care of a football from Wilson.
The important part of the football here is the surface texture - as in scuffed, or roughed up - and the rule was changed to let each team prep the balls to their own standards.
http://www.getnitrogen.org/sub.php?view=nascar
If the NFL used pure nitrogen as the gas to fill their footballs with, would your statement still be true:
"So the natural variation in pressure of footballs in NFL games from temperature alone is nearly 6 PSI."
The calculation is made for an “ideal gas”, so it’s the best case scenario. Yes, the statement would still be true.
If the NFL used pure nitrogen as the gas to fill their footballs with, would your statement still be true:
“So the natural variation in pressure of footballs in NFL games from temperature alone is nearly 6 PSI.”
Yes.
The effects of water vapor condensing are additional.
The main reasons for using Nitrogen in NASCAR are chemical. Nitrogen is chemically relatively inert to each metals and oils/lubricants compared to water and oxygen - especially when hot.
"The reason NASCAR tires are inflated with nitrogen, rather than the normal air we pump into our tires, is due to the increased stability under hotter temperatures that the gas exhibits. It allows the tire pressure (50 pounds per square inch) to remain constant throughout the race regardless of the temperature, which can reach 200 degrees Fahrenheit."
But that's another subject. Although it would tend to confirm that a football inflated to 12 psi would not vary, either way, by as much as 6 psi. In the real world a football that lost 6 psi over the course of a football game would be noticeable from the Goodyear Blimp.
The reason NASCAR tires are inflated with nitrogen, rather than the normal air we pump into our tires, is due to the increased stability under hotter temperatures that the gas exhibits. It allows the tire pressure (50 pounds per square inch) to remain constant throughout the race regardless of the temperature, which can reach 200 degrees Fahrenheit.”
But that’s another subject. Although it would tend to confirm that a football inflated to 12 psi would not vary, either way, by as much as 6 psi. In the real world a football that lost 6 psi over the course of a football game would be noticeable from the Goodyear Blimp.
Over those temperature ranges, the temperature effect on pressure is Just over 0.5PSI per 10 degrees from a 70F indoor temperature.
The 115F temperature variance I referenced is about a 5.8 PSI variance.
while not emphasized in the Wells report, it is in agreement with both the calculations and the experimental results they and Exponent obtained - and everyone else since the precise relationship was demonstrated in the early 1700s. This is not where people have issue with the report - aside from de-emphasizing such contexts.
As for the effect on a football, there’s some noticible difference in a room temperature ball , but not much between about 9PSI and 15 PSI, where the pressure is enough that the leather is held rigid, but not so much that it stretches the seams. The evidence suggests that Brady first became aware of pressure as a thing after the Referees pumped his team’s footballs up to around 16 PSI for a game with the Jets - which is enough to begin to deform the footballs.
Now we are talking about a 115 degree variance in temperature and its affect on the psi of a football. You are saying that a ball inflated to 12 psi at -15 degrees will increase in psi to (12+6), or, 18 psi when the temperature rises to 100 degrees. I will maintain that that is most "unnatural" and that you, sir, are the troll. I will go further and say that ordinarily a football is inflated to spec as per Wilson while at approximately room temperature (say 70 degrees). Should the temperature rise to 100 degrees that would cause an increase in psi of 1.5. Should the temperature drop from 70 to -15 one would expect a lowering in psi by slightly more than 4 psi. Neither scenario approaches your claim that "the natural variation in pressure of footballs in NFL games from temperature alone is nearly 6 PSI.”
Since the conversation was about footballs which varied from the 12.5 - 13.5 PSI starting point even if they all started at 13.0 when measured indoors then taken outdoors, my comment is on point. Footballs at 13.0 PSI taken from a 70F locker room to a 105F field would rise to 14.75 PSI, and the same footballs taken from the 70F locker room to a -15F field would fall to 8.75 PSI.
Most NFL outdoor football games are played with footballs which are out of specs, and no one cared.
Simply using Nitrogen as an inflation gas would not keep the footballs within that range...or even close. The pressure of a gas within a fixed volume varies proportionately to temperature, with little regard to what the gas is. The only real exceptions are from the gas becoming not a gas, such as through turning to liquid or chemical interaction - which are not appreciably at play here.
As an aside, I went back and did the calculations instead of the rough estimate in the previous post.
With a starting pressure of 13.00 PSIg at 70F
An increase to 105F would mean the pressure increased to 14.83 PSIg.
A drop to -15F would mean the pressure would decrease to 8.55 PSIg.
“In theory, theory and practice are the same. In practice, they are not.”
I believe he spoke these words in an address to NASCAR.
Your point about the difference between theory and reality is well taken. There are a number of modifying factors: mostly between an air-temperature measurement in the weather station, and the temperature of the gases inside the football. Most of these push the measurements further to the extreme.
The hot field and further heated ball on a sunny day; and a wet ball being subjected to evaporative cooling at the other.
Here is a report by a group of prominent engineers and physicists:
https://cbsboston.files.wordpress.com/2016/05/physics-professors-deflategate-filing.pdf
Nice graphs in Appendix B show how often from temperature alone footballs would be out of specs.
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