Tsiolkovsky Rocket Equation 3D Explorer vs Escape Velocity 3D Explorer
freetoolonline.com editorial team
Both pages teach a real spaceflight number in one page load - 0 MB installed, USD 0, no account. The Tsiolkovsky Rocket Equation 3D Explorer shows whether a rocket's propellant and exhaust velocity can BUILD enough delta-v for the trip; the Escape Velocity 3D Explorer shows the SPEED THRESHOLD a craft needs once it already has that delta-v.
The numbers side by side
| Aspect | Rocket Equation Explorer | Escape Velocity Explorer |
|---|---|---|
| Install size | 0 MB - runs in the browser | 0 MB - runs in the browser |
| Price | USD 0 | USD 0 |
| Key figure | Delta-v to low Earth orbit: about 9.4 km/s | Earth escape velocity: about 11.2 km/s (NASA JPL) |
| Governing formula | delta-v = v_e · ln(m0/mf) (Tsiolkovsky, 1903) | v_esc = sqrt(2GM/r) |
| What it varies | Exhaust velocity (2.0-4.4 km/s), propellant fraction (50%-97%), stage count (1-3) | Body (Moon, Earth, Mars, Jupiter, Sun) |
| What it answers | Can this rocket's propellant and engine reach orbit | How fast must a craft already be moving to leave a body's gravity for good |
Where the Rocket Equation Explorer wins
The Rocket Equation Explorer wins when the question is "can this hardware even get there" - it is the propellant mathematics upstream of any speed target, and the only place on the site that lets you feel why staging beats a single stage.
Where the Escape Velocity Explorer wins
The Escape Velocity Explorer wins when the question is a body-to-body speed comparison - it answers how a rocket's already-achieved speed stacks up against five real bodies' escape thresholds, which the rocket equation scene does not show at all.
A reasonable rule
As a reasonable rule, use the Rocket Equation Explorer first to see whether a rocket design can plausibly reach orbit at all, then use the Escape Velocity Explorer to see how that achieved speed compares against the thresholds of other worlds.
See how to use the Tsiolkovsky Rocket Equation 3D Explorer for a step-by-step walkthrough.
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