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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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Princess V46 / V48 https://www.scanboat.com/en/17320130
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Unveiled at January’s boot Düsseldorf 2026, the new 17-metre Contest 56CS. A fabulous evolution of the European Yacht of the Year-winning Contest 55CS. And introducing a remarkable new hardtop bimini option. More information 👉🏼 https://www.contestyachts.com/model/56cs #ContestYachts #BuildingDreamsTogether #Contest56CS #NewModel #Bluewatercruiser #Biminihardtop
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The Red Bird of Paradise get together at dawn and sunset. The male does an elaborate dance to attract the females. A great tour while in Raja Ampat, Indonesia.
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