How Rocket Engineering Works
Discover the engineering solutions that allow massive machines to escape Earth's gravity. Learn why rockets are 90 percent fuel, how staging solves the mass problem, and what makes rocket engines work in a vacuum.
Like Duolingo, but for How Rocket Engineering Works. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
A short one: 12 levels across 2 sections, about 24 minutes end to end, roughly 5 days at five minutes a day. It moves through The Flight Path and the Mass Problem and Hardware Solutions: Staging, Tanks, and Engines. It starts from scratch.
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Key ideas in How Rocket Engineering Works
- Reaching space (above 100 km) only requires climbing high, but staying in space requires moving sideways at roughly 28,000 km/h
- A rocket launched straight up will simply arc and plummet straight back down once the engines cut off
- Most of a rocket's propellant is burned to gain horizontal speed, not vertical height
- An orbit is a continuous free-fall where the spacecraft falls toward Earth, but moves sideways so fast that the ground curves away at the same rate
- Earth's gravity in low Earth orbit is still roughly 90% as strong as it is on the ground
- The sensation of weightlessness comes from falling continuously without hitting anything, not from the absence of gravity
- A rocket launches straight up initially just to punch through the thickest, lowest layers of air as fast as possible
- Shortly after liftoff, the rocket tilts slightly into a gravity turn, letting gravity naturally bend its path toward the horizon
- The final burns are aimed almost entirely horizontal to reach the necessary sideways speed of 28,000 km/h
- Max Q (maximum aerodynamic pressure) is the point where the combination of the rocket's rising speed and the lingering air density creates peak mechanical stress on the hull
- Engineers throttle the engines back momentarily around Max Q so aerodynamic drag doesn't tear the rocket apart
- Once the rocket climbs into thinner air, engines can safely throttle back up to full power
- A spacecraft in orbit possesses immense kinetic energy from flying at 28,000 km/h
- Carrying enough rocket fuel to brake to a standstill in space is too heavy, so spacecraft slam into the atmosphere to let air resistance do the braking
- Compressing and scraping against air at orbital speeds generates severe heat, requiring heat shields (either ablative tiles or reusable ceramics) to prevent the spacecraft from incinerating
- Around 85 to 90 percent of a fully fueled rocket on the pad is propellant
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives How Rocket Engineering Works the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
Imagine your rocket shoots 150 kilometers straight up and shuts off its engine. What happens next?
Get it right to open this lesson and 11 more in the app.
Where How Rocket Engineering Works takes you
- 1
The Flight Path and the Mass Problem
- The Orbit Trick: Why Rockets Fly Sideways
- The Fuel Paradox: The Rocket Equation in Plain English
- 2
Hardware Solutions: Staging, Tanks, and Engines
- Shedding Weight: Staging and Skin-Thin Tanks
- Choosing the Flame: Engines, Nozzles, and Fuels
2 sections · 4 units · 12 levels. Built to play, not to enroll.
Tomo is in ChatGPT
Tomo is also a ChatGPT plugin: the same playable courses, built and played inside your chat.
Add Tomo to ChatGPT- What to ask
- “Make me a Tomo course on black holes.” “Turn this chat into a Tomo course.”
- What you get
- Quick questions with instant feedback, hearts and stars, ready to play in about a minute.
- Where it goes
- No sign-up to start. Connect your Tomo account and your streak carries on in the app.
You pick the voice
How Rocket Engineering Works is taught in the Bestie style: your friend who just gets it. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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