Konstantin Tsiolkovsky
1857 – 1935
Deaf Russian schoolteacher who wrote the rocket equation before rockets.
A deaf, self-taught Russian schoolteacher, Tsiolkovsky derived the rocket equation in 1903 and proposed liquid-fueled, multistage rockets decades before anyone could build them. He worked in near-total obscurity in a log house outside Moscow.
He is the founding theorist of spaceflight — 'the Earth is the cradle of humanity, but one cannot live in a cradle forever.' The delta-v and specific-impulse tools here are his equation made interactive.
Portrait: a stylized blueprint-line rendering, not a photograph.
Contributions in the toolbox
- 1903
The rocket equation published, with liquid fuel proposed.
→ Tsiolkovsky Rocket Equation - 1903
11.2 km/s framed as spaceflight's price of exit.
→ Escape Velocity - 1903
Exhaust velocity identified as rocketry's key metric.
→ Specific Impulse