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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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Here in San Diego, we’re lucky to enjoy year-round sailing, with our crew hitting the water 7 days a week, all 12 months of the year. Southern California’s weather during January, February, and March is hard to beat—lately, we’ve been enjoying sunny days with temperatures in the 60s and 70s. One of the most common questions we hear this time of year is: "Will I get cold on the water?" The truth is, San Diego’s winter weather isn’t all that different from fall or spring.   Captain Dave’s Tip: Bring an extra layer—like a windbreaker or jacket—to stay comfortable during your sail. And don’t worry, we’ve got you covered with cozy blankets, especially when the sun begins to set on our Sunset Sails. Another reason to sail this season? It’s prime wildlife-spotting time! Whale-watching season is happening NOW through mid-April.  Join one of our Whale-Watching Sails to catch gray whales in their natural habitat as they migrate south to Baja, California, right along our coastal waters.   We can’t wait to welcome you aboard for a relaxing and memorable winter sailing experience! 🌞🌊

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Blending boat drinks on the Tiki

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ℹ️ What’s the 1 Surprising Swimmer Divers Never Expect? Spreading his magnificent fanned fins the Scorpionfish emerges from a perfectly camouflaged surround and when discovered this awkward swimmer shyly retreats to his hiding spot in plain view. Want to meet a Scorpionfish? Join us for a dive 👉🏽 https://cruisenautic.com/

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