我是說 asia version 的B90,
因 us version B90 unstung 340g + 12pt swingweight 係333
2 個version我都試過, 但我體質上真係打唔到支美版
Definition:Swing weight describes how heavy a racquet feels when it is swung. Swing weight increases as the racquet's weight is distributed more toward the head, so head-heavy and extra-long racquets have a high swing weight in relation to their stationary weight. A high swing weight results in low maneuverability, but generally more groundstroke power.
copy from: http://tennis.about.com/library/blswingweight.htm
其實係好physis 問題: E=MCsq
第一句解釋左 Blade 98 比 B90(asia) 要用多D 力去swing
最後一句就講左: blade 98 係會比B90 powerful D (Mass/swingweight of blade 98 > b90, if same accleration)但難D control (blade 98 要出力D先可以等同B90 accleration, 第一句的問題)
Six One is head light in 16x19 string pattern; Blade 98 is head heavy in 16x18.
I used to play K version on both of them. May be a bit differ from BLX but Six One version is stiffer, more control and good feel when you hit the smaller sweetspot comparatively. Blade 98 is more comfy, forgiving with the larger sweetspot.
If you are all court player, headlight is better; you are baseliner, headheavy is your choice.
Also, you looking for US version or Asia version??
Balance: Static measure of weight distribution in a racquet and measured from the butt end in inches and/or centimeters. Commonly referenced in "points" head light or head heavy - each "point" represents 1/8 inch. Generally speaking, heavier racquets are head light to maintain maneuverability, while most of today's super-light racquets are head heavy to supply enough mass (which translates into power) to the area of the frame where the ball is being contacted. A 27 inch racquet with a balance point of 12-1/2 inches is 1 inch, or 8 points head light (even balance would be 13-1/2 inches). A 28 inch racquet with a balance point of 15 inches is 1 inch (or 8 points) head heavy. Static balance ultimately affects swingweight, which is a dynamic measure of racquet maneuverability.
Swingweight: Measure of how heavy a racquet feels when swung, i.e. maneuverability. Also known as Moment of Inertia or Second Moment, swingweight is dependent on several factors, including racquet weight, length, balance, head size. A heavy swingweight racquet is more powerful than a light swingweight racquet (ATBE), but will be less maneuverable. Also, a heavy swingweight racquet can be relatively light in overall weight by placing the majority of weight in the head. A trend initiated by Wilson with their Hammer racquets, the objective is to retain maneuverability without sacrificing power by distributing most of the overall weight to the upper hoop, where ball contact is made. Swingweight can be increased by adding weight above the pivot point (where the racquet is gripped) or by increasing length. Swingweight (like overall weight) cannot be reduced unless the bumper is removed or racquet length is reduced. Keep this in mind when selecting a racquet to purchase - better to error on the light side and add weight if needed.
Here is a simple way to put it:
A heavier frame generates more power.
A heavier frame vibrates less.
A heavier frame has a larger sweetspot.
A stiffer frame generates more power.
A stiffer frame has a larger sweetspot.
A stiffer frame transmits more of the shock load to the arm than a more flexible frame.
A stiffer frame provides a more uniform ball response across the entire string plane.
A larger frame generates more power.
A larger frame is more resistant to twisting.
A larger frame has a larger sweetspot.
A longer frame generates more velocity and therefore more power.
The string bed in a longer frame generates more spin due to increased velocity.