DA> Note I said "sectional density".  As you say, the mass and cross
OK.  I'd not heard that term.  It might be a "ballistics" term, but
it's not an engineering term.
DA> sectional area come into play. Terminal velocity is proportional to
DA> mass, and inversely proportion to cross sectional area.  Mass divided
It appears to be inversely proportional to the square root of the
mass.
DA> In ballistics terminology, "drag coefficient" is said as 'ballistic
DA> coefficient' or abbreviated as B.C. or BC.
Ditto as in my first comment.
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