Assume a rocket with constant mass and thrust. To simplify things, we can ignore aerodynamic drag, and we'll also not perform a gravity turn, hence our flight plan is as follows: -Burn radially from sea level until apogee is 100km -Burn horizontally when apogee is 100km
How do you calculate the gravity loss from launch until apogee ( are there any equations)? If I remember correctly, it also depends on the TWR.
Secondary question: Does burning perfectly horizontally ever occur in any gravity loss? Is it best to burn horizontally straight away when apogee reaches 100km, or wait until apogee? (The Oberth effect states to burn when closest to the planet).