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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Discover a simple yet essential piece of equipment for life at sea in this quick YT short: the lee cloth. Learn how this unassuming piece of fabric can prevent you from falling out of your berth while underway, ensuring your safety and comfort on a sailboat. Don't underestimate the importance of a lee cloth in your sailing kit. Let us know in the comments if you have any more questions about life at sea and stay tuned for more helpful tips!

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UTTERN 6402 https://www.scanboat.com/en/17451918

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