Proof challenge

Explain the Four Strokes

Write a short, simple explanation of intake, compression, power and exhaust, with a sketch if you like. Post the write-up.

How it works

1. Join the challenge.
2. Do the work, then post a public https link or a short write-up as proof.
3. An entry completes when it's approved or reaches 5 votes from other players. You earn +250 XP and the Finisher badge.

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Entries