Quick test of a tiny QEV cannon firing air at 12atm, viewed through a Schlieren setup (no razor blade). Edited from to 1/4th 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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MERO may well be the best restored, refitted, and outfitted example of John Bain’s highly attractive, 36 ft ‘stretched’ Silverette Type of 1930s twin screw #motor #yacht. More than 25 years of care in current ownership have included a major restoration followed by structural and detailing #refits, and systems upgrades. MERO benefits from Silvers original semi-open wheelhouse arrangement, offering a fine weather ‘cockpit’ with the covers off, while her easily maintained, low-hours modern Beta diesel engines ensure smooth running and efficient manoeuvers. The whole is the perfect platform for cruising and exploring in classic style, but modern comfort. https://www.sandemanyachtcompany.co.uk/yacht/722/MERO

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