FT-sheilds

A quick question about sheilds (I`ve being playing FT for aprox 3 yrs,
and 
this has been bugging me since I read the rules the first time, but only
now 
remembered it to post it (D`ohh)).

What`s bugging me is the mass used for sheilds. A level 1 sheild is 5%
mass 
of the mounting ship, a level 2 10%. If a ship masses 90 mass, a level 1

sheild is 5 mass, a level 2 9 mass. What is bugging me is that wouldn`t 
twice the sheild have twice the mass? (IE, work out the sheild as 5%
ship 
mass times 2 instead of 10%?).

I use the printed 5% and 10% rules myself, but I had some free time * to

post this, and wanted to see what anybody else thought.

BIF

*free time, a mythical thing used to discribe someone whit no fleet of 
miniture starships left to paint.

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