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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Getting ready for Annapolis spring boat show 2014.

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When you want a 38 foot sailboat! Why do people keep buyign the Catalina 380? Is it better than the Beneteau? The Jeanneau? The Dufour? The Island Packet? Practical Sailor takes a look at sailboat reviews and talks to owners of the Catalina 380 Sailboat.

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Scanboat.com helps you find your next yacht or sail boat https://www.scanboat.com/en/0

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⛵💨🎉 "From behind to BOOM — game changer!" A small sailboat trails the pack… until a surprise gust slams the sails and launches it forward! It surges past a rival in a dramatic overtake — the crew erupts in cheers. 8 seconds of comeback magic! #SailingComeback #WindWins #RaceTurnaround #FromLastToFast #OceanThrill #SurpriseGust #CrewGoesWild #SailPower #EpicOvertake #RaceDayRush

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