08-04-2008, 11:31 PM
[quote flygoddess]But maybe it is the firmness that gives the sense of riding higher.
A thick skinned bladder with more air surrounded by a good solid cover = firmness.
Urethane does support more PSI then Vinyl, right?
Next question, if you drop a bowling ball and a marble from a tall building at the same time, which will hit the ground first?[/quote]
Bladder thickness has ZERO effect on firmness. A SaranWrap bladder at 4 psi in a Fat Cat skin will feel just as firm as a 1/8" thick urethane skin in the same skin at the same pressure.
As for psi, the skin is what determines the max pressure. Now if you take the bladder out of the bag, depending on thickness, urethane most likely will support more pressure. But the only time that's a bonus is if your main seam splits and your bag's guts come out. A super thick vinyl bladder will hold more pressure than a thin urethane one of course!
For the marble and bowling ball question, the answer is "it depends". I'll wager that a 6 lb kiddie ball vs a marble made of depleted uranium, the marble might have half a chance!
_SHig
[signature]
A thick skinned bladder with more air surrounded by a good solid cover = firmness.
Urethane does support more PSI then Vinyl, right?
Next question, if you drop a bowling ball and a marble from a tall building at the same time, which will hit the ground first?[/quote]
Bladder thickness has ZERO effect on firmness. A SaranWrap bladder at 4 psi in a Fat Cat skin will feel just as firm as a 1/8" thick urethane skin in the same skin at the same pressure.
As for psi, the skin is what determines the max pressure. Now if you take the bladder out of the bag, depending on thickness, urethane most likely will support more pressure. But the only time that's a bonus is if your main seam splits and your bag's guts come out. A super thick vinyl bladder will hold more pressure than a thin urethane one of course!
For the marble and bowling ball question, the answer is "it depends". I'll wager that a 6 lb kiddie ball vs a marble made of depleted uranium, the marble might have half a chance!
_SHig
[signature]