Part 25 is Step 22, making the boat go faster by restricting the straws a little at the end, just like real jet engines and rockets. Finally you can tell the control freak (me) to go soak his head, and you can break loose with experiments.
You can find more DIY science projects like this at http://www.sciencetoymaker.org/
Duration : 0:4:46
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Part 21 is Step 18, the step when you finally get to power test the engine! You don’t need a boat to power test the engine. You must prime the straws every time you use the engine. And the first time you use the engine you should slosh some water around inside the engine so the little droplets of water can flash to steam and get your engine going. To start out put the candle flame in the middle between the front and the back of the engine.
Duration : 0:4:15