"Gary" wrote in message
oups.com...
That sounds about right. As a rough rule of thumb, mortar-fired
firework shells go up about 100 feet per inch of diameter.

At our recent fireworks, (pretty good sized display) It seemed to me, that
the shells took about 6 seconds, from launch to explosion. If they were
nearly stopped, and about to come back down, it would work out (using math)
to 576 feet.
--
Jim in NC