Quick test of a tiny QEV cannon firing air at 12atm, viewed through a Schlieren setup (no razor blade). Unedited at normal speed. I didn't quite understood the need for a razor blade but without one I still see the flow of air. For me, the razor blade just makes the dot of light smaller(?) If anyone can clarify me what the razor blade really does and where it should be placed (in the source of light or in the camera) I'd really appreciate. Also important to note that this is AWESOME to look with the naked eye but almost the dimmest light can blind you. I covered a tiny LED torch with aluminum foil and punctured a hole with a sewing needle, on the side! so that the LED doesn't bright directly through the hole. Take care with the eyes!!

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Unique America is a story-driven travel series exploring the most unique experiences across the United States — one place, one story at a time. You'll love these videos! 👇🏼 https://youtu.be/MRfKeuS-JKU https://youtu.be/8ZjwlGUiAAg https://youtu.be/4M44xG7AlFA 🌎 Join us on our next adventure → https://theadventurecrews.com/experiences-with-the-crews/ © The Adventure Crews 2026

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Kelly Whittle will be speaking at the IHF Event 2018 in Brisbane Australia.

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We've been told that this well-stocked Grocery in George Town Exumas is largely due, in part, by the effort of the Bahamas to make cruisers feel welcome here. Well, whatever the reason, this is one of the better stocked groceries in all of the Bahamas (that we've found)...Perhaps third to only New Providence and Spanish Wells. Thank you, George Town!

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