38 lessons · 8 modules · free

Learn how impellers work — from zero to expert

Short lessons with everyday comparisons, animations you can play with, and a quiz at the end of each one. No maths needed to start. No sign-up.

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By the last lesson you’ll know every part of this — and how to design your own.

How every lesson works

  1. 1

    Everyday comparison

    Every idea starts with something you already know — a salad spinner, a garden hose, a merry-go-round.

  2. 2

    Watch it move

    Animations show what happens inside, in slow motion if you want.

  3. 3

    Try it yourself

    Drag sliders, flip switches and see the result right away.

  4. 4

    Quick quiz

    Three questions to lock it in. Earn XP and climb from Beginner to Expert.

The course

Eight modules, from “what is water?” to designing and building your own impeller.

Your rank

Curious Beginner

0 XP · 400 XP to Apprentice

  1. 01

    The Basics

    Beginner0 of 6 done

    Water, pressure, flow and spinning things — everything you need before meeting an impeller.

  2. 02

    Meet the Impeller

    Beginner0 of 5 done

    What an impeller is, what its parts are called, and how it moves water step by step.

  3. 03

    Types of Impellers

    Intermediate0 of 7 done

    Radial, axial, open, closed, curved forward or back — the whole family, and why each exists.

  4. 04

    Where They’re Used

    Intermediate0 of 4 done

    Impeller spotting: at home, in vehicles, in cities and in surprising places.

  5. 05

    Performance

    Advanced0 of 6 done

    Head, pump curves, efficiency, the affinity laws and cavitation — reading a pump like a pro.

  6. 06

    Design

    Expert0 of 6 done

    Velocity triangles, Euler’s equation, specific speed and the real-world losses designers fight.

  7. 07

    Build One

    Expert0 of 3 done

    Design your own impeller, 3D-print it, build a small pump and measure how well it works.

  8. 08

    Final Exam

    Expert0 of 1 done

    Prove it: a mixed exam across the whole course, with a certificate you can print.

Pumps in the wild

Heart pumps, rockets, jet skis and more — explained with what you learn here.

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