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Posts by ghalfaire

I too like my old G15 driver.  I found it the the used club bin a few years ago for $75 but it looked like new.  Mine is a reg. flex shaft and a 9 degree loft.  Not sure it is the most accurate or longest driver I have ever owned but seems the "most comfortable" for me so have not been tempted to fork over $400 to $500 for a new one.  I probably wouldn't do that anyway I'd either wait for a sale or keep searching the used club bins.
After having read the "rule", such as it is, I believe this is correct.  If the referee says the game balls are good, then they are good. I guess I was surprised that there is not a requirement the referee measure the pressure but the way the rule is written he/she could just squeeze the balls and say "these are OK" and the rule would have been followed to the letter.  So Bilicheck is probably telling the truth when he said they followed all the rules and procedures 100%....
Quote:   Rule 2 The Ball Section 1 BALL DIMENSIONS The Ball must be a “Wilson,” hand selected, bearing the signature of the Commissioner of the League, Roger Goodell. The ball shall be made up of an inflated (12 1/2 to 13 1/2 pounds) urethane bladder enclosed in a pebble grained, leather case (natural tan color) without corrugations of any kind. It shall have the form of a prolate spheroid and the size and weight shall be: long axis, 11 to 11 1/4 inches; long...
Does anyone know what the reason for the rule is?  I was thinking it might be more about the kicking game than anything else.  But who knows?
Nice to know you.  I too have a masters in engineering (electrical) but didn't use the Gas Law much, if at all, in my work.   There really isn't a lot of information coming out of the NFL so it is difficult to assess what really happened but for me the temperature change required to get a 15% or so reduction in pressure isn't what happened.  I would have to think the retest of the balls after the game were performed by the same equipment and environment as the initial test...
I don't know that I would bet money on it but I sure would like to see the first JD win.  He certainly has talent if he can just keep himself together long enough he'd be a force to be dealt with.
Did you watch and listen to the entire video?  At the end of the video they say that the results don't correlate with the Ideal Gas Law.  Surely you are not questioning the validity of the Ideal Gas Law. They (whoever they are) attribute this lack of correlation to the laws of physics to leakage of air from the ball (which was sitting in a garage for 8 years so probably a good guess).  There were so many uncontrolled variables in this experiment it is really meaningless...
Here is a URL for all that would like to have some knowledge of the Ideal Gas Law.   http://chemwiki.ucdavis.edu/Physical_Chemistry/Physical_Properties_of_Matter/Phases_of_Matter/Gases/The_Ideal_Gas_Law   I am sure there will be a bunch of you that just can wait to see this.   You might pay special attention to the fact that the units used in the equation have to be consistent, otherwise you get an incorrect answer.  I won't bore 99% of you that don't care about the...
Losing a couple of pounds of pressure in a tire inflated to 30-35 psi is a lot different than losing a couple of pounds of pressure in a football inflated to 12.5 psi. 
Nice try but you should do a Google search on "Amontons Law" (a derivation of the Ideal Gas Law) to see what kind of temperature change it takes to get the pressure of 12.5 psi to drop to 10.5 psi making the assumption that 12.5 psi is at 100 degrees F.  If I did the arithmetic correct if the balls are inflated to 12.5 psi at a temp of 100 deg F it would take a temperature drop to 10 deg. F to reduce the pressure to 10.5 psi.  Don't you just hate physics?   It was cold...
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