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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Step aboard the all-new Prestige F4 (4.9) and enjoy the perfect mix of French style and smart design. This new model in the Prestige line offers lots of space, plenty of natural light, and a smooth ride – perfect for relaxing cruises or unforgettable weekends on the water. At Lengers Yachts, we’re proud to present this beautiful yacht. Every detail shows Prestige’s focus on comfort, quality, and smart design. Want to know more or plan a private viewing? Visit our website: www.lengersyachts.com

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Ann and Matt of BoatUS teach boaters how to tie a figure eight or stopper knot. This is a very valuable knot for sailors to know. http://www.boatus.com Join BoatUS Today! https://www.boatus.com/BoatUSMembershipExpress/page0.aspx?programtype=MWSBUSJOIN&programtypecode=mwsjoin&promocode=HEWEBYT

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voilier ahousa un grand Mercié a la personne qui a fait la soudure

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