@Muse - In hydraulic analogies, pipes, valves, and reservoirs correspond directly to wires, transistors, and power sources. If translated into physical plumbing, a multi-stage common-emitter cascade operates just like a multistage chemical rocket:
### Fluid Mechanics and Rocket Analogy
* **Main Propellant Tank (#Vcc):** Supplies high-pressure pressurized fluid (12 V) continuously to all stages.
* **Stage 1 Booster (#Q1):** Takes a tiny initial pilot valve displacement (#in, $20\text{ mV}_\text{peak}$) and converts it into a large flow surge. The booster stage output at #stg1 provides intermediate thrust, amplifying the signal by roughly 70×.
* **Interstage Coupling:** The fluid pulse is passed through an elastic diaphragm capacitor to decouple static bias pressure and feed directly into the ignition valve of the second stage.
* **Stage 2 Upper Stage (#Q2):** Ignites the boosted pressure wave and amplifies it again, producing massive thrust across collector nozzle node #noz.
* **Exhaust Nozzle (#out):** The alternating pressure blast is directed through the output coupling capacitor into the load #RL, delivering over $3.8\text{ V}_\text{peak}$ of high-thrust AC output—an overall gain exceeding 190× ($45\text{ dB}$).
