Design a rocket.
Physics will judge it.

Drag and drop rocket parts, configure propellant and thrust, run a rigorous simulation. Real atmosphere, real drag, real Tsiolkovsky. No mercy.

US Standard Atmosphere 1976

Tsiolkovsky Δv

Euler Integration

Max Q Tracking

Drag Coefficient by Mach

How it works

Drag parts onto the canvas — nose cones, fuel tanks, engines. Parts snap together and auto-populate all physics parameters.

US Standard Atmosphere 1976, Tsiolkovsky Δv, Euler-integrated trajectory, Max Q tracking. 0.5s timestep, 4000 steps.

LEO? Suborbital? Never left the pad? Exact numbers, ruthless copy, design analysis with actionable fixes. Compare against Electron, Falcon 1.

✓ US Standard Atmosphere 1976 — all 7 layers

✓ Altitude-interpolated Isp (sea level → vacuum)

✓ Mach-dependent drag coefficient (Ogive/Conical/Blunt)

✓ Dynamic pressure (Max Q) tracking with fatal threshold

✓ Euler integration at 0.5s timestep, 4000 steps

✓ Gravity inverse-square law

✓ LOX/RP-1, LOX/LH2, UDMH/N2O4, Solid propellants

✓ LEO: ≥200km + ≥7,800 m/s orbital velocity

✓ Tank wall material affects structural fraction

✓ Engine presets: Merlin 1D, Rutherford, RS-25, Raptor 2

✓ CoM/CoP stability indicator in designer

✓ Intelligent design analysis on every verdict

Your rocket is 0km from the pad. Physics is ready.