Pop-Pop or Phat-Phat boats have been a intriguing steam toy for ages.
Make your own simple steam pulse engine boat using a refrigeration copper coil, tealight candle, aluminium baking pan and binder clip.
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You tend to get hot gases accumulate at the top. That is why the horizontal loops perform badly, they get air blocks at the top of each loop. The vertical loop accumulates all the gases and quickly exits, leading to much higher performance.
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