Sailing boat - Både sælges, Winga 78, 1982 DKK 140.000 Scanboat https://www.scanboat.com/en/boat-market/boats/sailing-boat-winga-78-17462863

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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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I am honored to share with you some great talks on nudibranchs and other sea slugs by researchers from all over the world: Japan, Brazil, Spain, USA, Thailand etc. Every week on Thursday and Sunday a new video. I am very grateful to all my colleagues that agreed to contribute to this project and I hope that these amazing sea slugs and scientists inspire you to learn more about our sea life and help to conserve our oceans 💕🌊

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Perfect day for sailing

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