PPolySim OS
For Educators · Rocket Flight

Rocket Flight for a carousel

Built for educators teaching it to a class. Drop a live demo into a lecture or assign it as a shareable link — no lab installs. Simulate a carousel live below — adjust the inputs and watch it respond, right in your browser.

Rocket Equation (Tsiolkovsky)Live

Delta-v budget

5524 m/s

LEO (Earth orbit)
59%
Moon transfer
44%
Mars transfer
42%
Escape Earth
49%

Controls

The equation that rules spaceflight. Your Δv budget depends only on exhaust velocity and the ratio of full-to-empty mass — and it's brutally logarithmic.

Presets

▶ Run in Python

Data Inspector

Δv5524 m/s
Mass ratio5.00
Propellant400 t
Exhaust vel.3432 m/s

Governing equation

Reading this result: At 5524 m/s this stage cannot reach orbit; since Δv grows only with the log of mass ratio, big gains need a much emptier tank or higher Isp.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

2

Rocket Staging

open full solver →
Rocket StagingLive

Controls

Presets

The rocket equation grows delta-v only with the logarithm of the mass ratio, so a single stage hauling empty tanks all the way up is hopelessly inefficient. Staging drops dead weight along the way: each stage contributes ve·ln(mass ratio), and their sum easily clears the ~9.4 km/s needed for low Earth orbit.

▶ Run in Python

Data Inspector

Δv per stage4.76 km/s
Total Δv9.52 km/s
Reaches LEO?yes

Governing equation

Reading this result: 2 stages at Isp 350s and mass ratio 4 each sum to 9.5 km/s — past the ~9.4 km/s LEO budget, since every stage adds ve·ln(ratio) after dropping dead weight.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

3

Standard Atmosphere

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Standard Atmosphere (ISA)Live

Controls

Presets

The International Standard Atmosphere is the reference model all aircraft and instruments are calibrated against. Temperature falls steadily through the troposphere at 6.5 °C/km, then holds constant in the stratosphere above the tropopause. Pressure and density decay roughly exponentially — at airliner altitude the air is only a quarter as dense as at sea level.

▶ Run in Python

Data Inspector

Temperature-50.0 °C
Pressure26.4 kPa
Density0.413 kg/m³
% sea-level ρ34%

Governing equation

Reading this result: Below the 11 km tropopause, temperature falls at 6.5 °C/km — here it is -50 °C and the air holds 34% of sea-level density.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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More with Rocket Flight

Frequently asked questions

Is this good for educators?
Yes — this version of "Rocket Flight for a carousel" is framed for educators teaching it to a class. Drop a live demo into a lecture or assign it as a shareable link — no lab installs.
Do I need to install anything?
No. It runs in any modern browser, free, with no account required.