Yes, ZSPD is a tad smaller than ZF, but only most noticeably at the bottom where it's shorter by 3-4mm. Along with the bright neon orange colour, the compact frame makes it look like a toy racket, imho.
I'll try to get a frequency reading of LCW and Tago's hits when I get home tonite.
There are only 3 factors that affect pitch or frequency of a string.
If you replace the length with the SQR(AREA), because you may to account for the "woven pattern" of applied strings of a real racket, not just the length of one long string, then you may get a more accurate calculation.
Informed by some Physics Department, University of Sydney, Sydney, Australia, in July 2006.
My smashes make a crack like Thor's hammer when I hit them, which is sometimes accompanied by a shrill feminine scream, if there was an opposing female player standing near the shot, who now finds that the hypervelocity wind from the shuttle has ripped off her top. The shuttles make a crinkling, cracking sound when my opponent tries to pull them free from the splintered wooden flooring, sometimes with a frightened whimper.
I have encounter a player that place a strip of transparent scotch tape on the last row of his racquet. The sound is loud when he smash but to me that is like adding a bigger exhaust to your car, which only amplifies the sound with no added improvement......
I swear fresh new PG65 on plastics made a sound like an old western gun shot pinging off a rock Was most glorious but short-lived. I do dare say that I found it more pleasant and characterful than the whip crack of a clean feather hit.