Swing weight vs Balance

[pspcpog]

I was just wondering about the relationship between balance point and swing
weight of a racket.

My question is, could two rackets sharing every aspect (weight, length, head size,
material composition, balance point, etc) except the weight distribution alone
have two different swing weights?

I'll make this question simpler by using only one racket.

Say you are customising a racket by two different methods without changing
the original balance point.

1. applying 5 gram of lead on both ends (racket tip and butt cap).
2. applying 10 gram of lead where the balance point is (usually the throat).

Question: Is there a swing weight difference between 1 and 2?

 

[loubapache]

Yes, there will be a difference. In most cases (for every practical racquet) , scenario 1 will have a higher swingweight.

 

[pspcpog]

Thanks for the quick reply loubapache.
Is there any formula for this by any chance?

 

[loubapache]

There are a lot of posts about this here. If you do a search, you should be able to find many. This thread has some numbers.
http://tt.tennis-warehouse.com/showthread.php?t=74784&highlight=swingweight

Basically, the extra "swingweight" from the added "weight" is equal to the added mass (in kilograms) times the distance from the added mass to 4" from the end of the butt cap SQUARED. This distance is in centimeters (cm).

Here is a racquet calculator you can use:
http://www.racquettech.com/store/learningcenter/lc_swingweight.html