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Old 10-20-2012, 08:33 AM   #27
corners
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Join Date: Jul 2008
Posts: 5,155
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Just wanted to note that Topspin Cyberflash 17L, which comes in as the least stiff copoly in Chicago Jack's updated list is quite a soft poly, but the stiffness number being so low is largely a result of how poor it is at holding tension. (The stiffness is measured after tension loss.)

Here is Cyberflash 17L vs. Gosen Sidewinder (Stiffness) ... (CoF) ... (Total Tension Loss):

Cyberflash 17L (166.3) ... (.098 ) ... (34.8 )

Sidewinder 17 (180.6) ... (.090) ... (24.5)

Both strings were strung at 60 pounds but after striking the strings with a hammer 20 times in a manner designed to simulate 20 120 mph serves, the Cyberflash 17L ended up at 27.52 pounds and the Sidewinder 17 ended up at 37.84 pounds. These are the tensions at which they were tested for stiffness. The Cyberflash had ten pounds less tension on it at that point - no wonder it tested so incredibly soft.

If we use the TWU String Performance Database and sort by "Actual Tension", the actual tension it is tested at following the tension-loss simulation, we can do a more direct comparison of the stiffness of these strings:

Cyberflash 17L (strung at 60 pounds, but tested at 27.2): (166.3)

Sidewinder 17 (strung at 50 pounds, but tested at 27.85): (159.4)

(Also, I think Nanosilver is a multi)
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