[FT] Asteroid Collisions

Hi All,

I need opinions on damage from asteroid collisions. My idea:

A ship colliding with an asteroid takes a number of dice damage equal 
to 10-<Main Drive rating>. Thus a ship with a Main Drive rating of 4 
would take 6 dice of damage.

This would give more maneuverable ships the advantage, as they might 
be able to change direction enough for a glancing blow.

Comments? Alternate ideas?