Hohmann Transfer DeltaV Calculator v1.2

Calculates and displays the required DeltaV for a Hohmann Transfer Maneuver as well as the orbital periods and transfer time. For the sake of simplicity, I've chosen a set of equations that work well under the following assumptions:

• Both the current and target orbits are assumed to be circular (or very nearly so).
• The transfer itself consists of two(2) discrete impulsive maneuvers(burns) arranged 180° apart relative to the parent body. The first burn (Transfer Orbit Injection) puts the craft into the transfer orbit, and the second burn(Orbital Insertion) completes the transfer.
• Drag is currently not accounted for. The calculations are very accurate in the vacuum of space(including the surface of some moons/etc), but not so much in atmospheres. As such, a large fuel margin is advised.
• The "Time of Transfer", or the length of the transfer in units of time, is half of the transfer orbit's period since only half of the orbit is used.

Instructions:

After downloading this craft, save the Vizzy program for use in any crafts you have. [If you don't know how to do this, see below.]

After saving the program, open your chosen craft in the designer and "import" or "load" the program. Save it to the craft, and click on the play button in the designer(ie, launch the craft).

Use [AG1] to manually set the target orbit altitude(ASL) while in flight. The default target ASL is 0m, but it can be set to any number at any time with AG1. The data display will reflect these changes as the program calculates the new target and transfer orbits.

All data is calculated in real time, and as such will continuously change if not stationary, even without expending DeltaV. Keep this in mind when dealing with highly eccentric orbits as the values shown can change drastically throughout the orbit.

Positive(+) numbers indicate a burn in the Prograde direction, and negative (-) numbers indicate a burn in the Retrograde direction. Transfers can have a positive and negative component if the original orbit is both eccentric and has extremes(periapsis and apoapsis) on either side of(above and below) the target orbit.