There is a strong correlation between the swing weight and power potential of a tennis racket.

Source (recommended reading)

http://twu.tennis-warehouse.com/learning_center/specsandspeed.php

When the same racket is just extended the power potential will be higher.

Compare for instance:

• Babolat Pure Control 95 and 95+
• Dunlop CX200 and CX200+
• Yonex Ezone 98 and 98+
• Yonex Vcore 100 and 100+

With the following tool:

http://twu.tennis-warehouse.com/cgi-bin/comparepower.cgi

To get an idea / reference about the power potential percentages you may check a very low powered and a very high powered frame you are familiar with. For example a Babolat Pure Storm Ltd GT (very low powered), that one has a power potential of 38.2% in the centre of the head, while the Babolat Pure Strike 100 3rd gen (high power) has a power potential of 41.7% in the centre of the head. This gives some perspective on those percentages.

Increasing power by increasing swing weight.

A. By the use of lead.

You can increase swing weight with 20 points by adding 6 - 8 grams of lead @ 12 o'clock. However this makes the racket 2 - 3 points more head heavy. Besides that, the static weight increases also with 6 - 8 grams.

In this case maneuverability will be decreased because of:

• higher swing weight
• higher static weight
  
• more head heavy balanceher

B. By extending the racket.

Another way is to extend your racket, a 1/2 inch equals 20 swing weight points, for most brands this extension can be done without an increase in static weight.

In this case maneuverability will only be decreased because of a higher  swing weight.

An exception are Head rackets, here it adds about 8 grams, and would make it a few points more head light and results in a higher static weight also.

In this case maneuverability will be decreased because of:

• higher swing weight
• higher static weight
  

However, the balance shifts to the bottom, it becomes more head light and that is usually perceived as more maneuverable.

Maneuverability

The maneuverability and swing weight are just as strongly related as power and swing weight, a higher swing weight is more difficult to accelerate by definition so a tennis racket with similar swing weight will have similar maneuverability, all other things equal.(*)

(*) For example a Pure Strike 100 with 6 - 8 grams lead at 12 o’clock will be just as easy / difficult to swing as a 27.5 inch Pure Strike 100 without the lead.

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