I think that a lead tipped dart has such a high terminal velocity that it cant be reached within this atmosphere.

quote:

I think

Now theres your problem.

Follow this link and do the calculation.

that link only tells how fast the terminal velocity is,not how high it needs to be to reach that

quote:

Originally posted by mazzman.jazzman:
that link only tells how fast the terminal velocity is,not how high it needs to be to reach that

There is no way to tell how high you have to drop from to reach terminal velocity without knowing the drag coefficient of the dart. It's very unlikely that it would be higher than about 100,000 to 120,000 feet, though. It's also very unlikely that the terminal velocity of the dart in the lower atmosphere would exceed Mach 1.