🔧 Rocket Lab
Build a rocket: choose how many stages it has, how much fuel each one carries and how many engines sit at the bottom. Then launch it and see how far it gets.
Weight
66 t
Push vs weight
2.61
How much of it is fuel91%
Press launch to find out what happens
🔬 For grown-ups: how this is worked out
Each stage contributes Δv = Isp · g₀ · ln(m₀/m_f), summed from the top down, with 300 s of specific impulse and 4 t of dry mass per stage. Orbit is treated as 9,400 m/s to include gravity and drag losses. Thrust uses the real Merlin figure of 845 kN per engine. The logarithm is why doubling the fuel does not double the speed — and why a second stage beats a bigger first one.