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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Des conditions toniques pour Romain Attanasio

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How to save someone that goes overboard and you’ve got both sails up? Without tacking or jibing, you go into a broad reach, bring the sails in tight, and heave-to. The sheets stay as they were. You’re effectively putting the sails over to the wrong side of the boat. By doing this you put the boat in position for the casualty to drift towards the boat and you also stop forward motion. With the engine, you then go forward and backward lining up the casualty along the beam of the boat…waiting for the person to drift down. Have you ever done this kind of MOB procedure? It’s not commonly taught in sailing schools. Follow us for more tips on becoming a confident sailing cruiser! #sailingexperience #sailingexperiences #learntosail

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