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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LAK II is a beautiful yacht that in a sense carries in her timbers the story of France over the past 85 years. https://www.sandemanyachtcompany.co.uk/yacht/742/LAK%20II Born in a brief period of optimism between depression and war, and somehow a survivor of that war’s deprivations; designed by a young naval architect, André Mauric, whose genius would later become universally recognised; vibrant participant in the carefree post war years, and in France’s intense America’s Cup campaigns of the 1970s... But in the end, a wonderful yacht because André Mauric had that touch of technical and artistic flair that guarantees immortality. LAK II was given a new lease of life in 2007 that ensures another lifetime of pleasure giving. In current ownership in England she has been recently given a fully electric propulsion system and new sails, and won her class at the 2022 edition of British Classic Week.

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How Big is a Sailboat Compared to Macy's Snoopy Balloon? #sailing #boat #shorts

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Lezione di nodi : Il parlato

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