2026-11-05

Meco Mission Log: the father of Russian aviation also solved a plumbing problem

Nikolai Zhukovsky gave aerodynamics one of its founding results: the lift theorem with his name on it. In 1898 he presented something much less glamorous. Water mains were getting damaged, and he worked out why.

You'd think the dangerous moment in a pipe is when the water is rushing through it. It isn't. It's when the water stops.

Picture a queue of people walking briskly into a door that slams shut. The front of the queue stops. Everyone behind keeps coming, and so they pile in, and the crush ripples back down the line. Water in a pipe does exactly that. It has momentum, and when a valve shuts, that momentum turns into pressure, a wave of it that runs back up the pipe and bounces.

Zhukovsky showed that the damage came from exactly that: the sudden rise in pressure when a valve closes fast. He also gave a formula for how slowly you must close a main to keep it safe. Engineers call it water hammer, and rocket engineers design around it too. NASA counts it among the loads a propellant feed line must survive at start-up and shutdown.

In Meco, you can feel this in Mission 4. Slam the valve shut and the pressure behind it jumps tenfold. Then it rings, and for a moment the LOX runs backwards. Close the same valve over a tenth of a second instead, and it barely notices.

Patience, it turns out, is an engineering parameter.

Meco is a rocket engine design sim I build alone, in Early Access on Steam. What surprised you when you first played? Tell me on the Steam post. Wishlist Meco on Steam.

-- Dannie