Actually the formula is

(Eq 1)

Which, as you mentioned below, comes from a Taylor expansion about the point r=Re=Radius of the Earth. We also define

(Eq 2)

Fortunately, the Rocket Equation gives an answer. The NASA Web Site shows how the Rocket Equation is applied.

As you mention, it does look a lot like Pegasus.

I will think about it: I´m kind of busy these days.

## Bookmarks