Contact Delta-V Desk

Corrections, questions and suggestions for new orbital mechanics calculators are welcome. Email logan.luo@adsnova.cn; we usually reply within a few working days.

Reporting a Calculation Problem

The fastest way for us to check a result is a message that includes:

• The calculator and every value you entered, with units, exactly as typed, including the central body or planets selected
• The result you expected and where it came from: a textbook problem with its edition and page, a mission press kit, a lecture note or a simulator
• The constants your source used, if you know them, such as Earth’s mean radius of 6,371 km instead of the equatorial 6,378.137 km, or a rounded μ
• Whether the difference is in the last digit or larger, since rounding of constants explains most small disagreements

Homework and Course Questions

We are happy to explain how a formula on the site works, but we cannot solve assignments or exam problems for you. If a worked example in our articles is unclear, tell us which step and we will consider rewriting it.

Suggesting a Calculator

We are considering tools for plane change and combined burns, bi-elliptic transfers, sphere of influence and Hill sphere radius, ground track repeat cycles and atmospheric decay estimates. Tell us which you would use, and in what course, game or project.

What We Cannot Help With

We cannot review the design of a real satellite or rocket, provide mission analysis for a commercial project or give advice on amateur rocketry safety. For those, contact a qualified aerospace engineer, your university department or your national rocketry association.

Response Times

We aim to reply within five working days and handle reports of a wrong result first.

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