Math is an abbreviation, maths is a contraction. The normal convention when using an abbreviation is to follow it with a full stop. Contractions can be used without the full stop. I never figured why the drift from maths to math happened.

Anyway enough thread drift about mathematics and English. Any other answers for the OP? I would suggest getting open rocket simulator and using that to see what can be achieved. Alternatively Kerbel Space Program may work, but I have not used it at all.

They're both equally correct/incorrect. Both derived from the Latin “mathematica” (singular) and mathematicae (plural). No "S"s. And both are abbreviations; neither is a contraction. Both uses evolved around the same time, separately.

Mathematics is a mass noun, which by definition is a singular, not a plural noun, that means the

*science* of a collection of numbers and shapes. It could also be argued that it is a plural noun referring to the collection of all mathematical sciences (trig, algebra, calculus...). Is "linguistics" plural or a singular mass noun? What's the singular if you say it's plural? The adjective "linguistic"? What's the plural of information, another mass noun? Not "informations" because that's nonsensical in all English-speaking nations (though a common mistake with ESL learners). English is a conundrum of twisted and evolved/devolved word constructions and uses. Through, threw, thorough, tho... One of the more difficult languages to learn as an adult ESL learner.

They are both equally correct, for the exact same reason---because they are both human shortcut inventions.

__Back on topic__--Like Over-the-Top said (even if he was a little confused about "maths" being a contraction), Open Rocket is great free software for a newcomer/returnee to plot out anticipated flights using kit rockets and different motors, and also for assisting in creating and predicting the flight characteristics of your own rocket designs. If you don't have it on your puter, you'll need to download a Java extension so you can open the program, which is simple to do. If you opt to download Open Rocket (or buy more advanced RockSim) and need any help then there's plenty of people here who will be happy to assist you.