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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Sailingboat - Både sælges, Hallberg Rassy 382, 1987 EUR 137.800 Scanboat https://www.scanboat.com/en/boat-market/boats/sailingboat-hallberg-rassy-382-17511261 Company info: In Ellös, Sweden, Hallberg Rassy is famed for quality boats like the elegant Hallberg Rassy 42 and compact 310. These well-crafted vessels excel in tough conditions, appealing to sailors globally. Hallberg Rassy’s shipyard crafts exceptional boats, creating lasting seafaring memories.

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Visit Cuba's Gardens of the Queen aboard All Star Avalon II. The Jardines de la Reina marine park is only accessible by dive liveaboard and home to some of the world's best diving! Dive with 6 species of sharks, goliath grouper, huge schools of fish, amazing macro-life in warm waters with great visibility. All Star Avalon II is a luxury liveaboard departing from Jucaro, Cuba to the Jardines de la Reina marine park. Guests can log up to 22 dives per week, snorkel with crocodiles, shore excursions to the beach to see the endangered hutia and snorkel mangrove channels. U.S. citizens can legally travel to Cuba under a humanitarian program by helping the Cuban people through our marine conservation efforts.

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