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Old 02-19-2013, 09:55 AM   #34
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Originally Posted by mongting View Post
So, from the link, the advantage of plus(longer) racket is only for the serve when you hit it near the tip . You get less rebound power than shorter racket. Is this a right statement?
Hi Mongting -

Yeah, that's kind of confusing. I had to re-read that section 3 times the first time I read it for it to sink in properly. Here is the key quote about racquet length and rebound power.

Quote: "There is a simple reason that long racquets have a smaller RP. In order for a long racquet to have the same swingweight as a short racquet, weight has to move out of the head and relocated closer to the handle. Since RP is determined mainly by weight in the head, a long racquet must therefore have a smaller RP than a short racquet (at any given swingweight)."

Link [2] Raw Racquet Power, By Rod Cross

Here is my translation of that quote.


Racquet A: has a sw of 320, and is 27 inches.
Racquet B: has a sw of 320, and is 28 inches.
Then Racquet B must have less mass in the head of the frame.

Remember that sw is measured by clamping the racquet into the the RDC machine at 10 cm (about 4 inches up on the grip) and is rotated around that axis. So a 28 inch frame gets a boost in sw not from more mass in the head, but from the length of the frame. If you took a 27 inch frame with a 320 sw, and added another inch to it by sliding the buttcap down, you'd increase the swingweight dramatically (about 10 units for every 1/4 inch or so) with the end result of a racquet in the 360 range. So to get that back down to 320, you'd have to shift a bunch of mass out of the head, and back into the handle. That's why it's not uncommon to see extended length frames with balances of -16 points.

Bottom Line: If two racquets are identical sw, and one is longer, the longer frame usually has less mass in the business end of the stick.

9x Donnay Pro One 97, Custom Ordered 62ra | RPNY Leather | Gut/Zx | 12.7oz, 12hl, 340sw | Currently Mod Tinkering w Tec315Ltd., Blade98s, Steam105s

Last edited by ChicagoJack; 09-21-2013 at 09:19 PM.
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