Quick test of a tiny QEV cannon firing air at 12atm, viewed through a Schlieren setup (no razor blade). 1/8th speed (15fps) and improved video performance because somehow Youtube cropped the last frames of the other videos (?) 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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Alfred Mylne may have peaked when he designed the River Class over 100 years ago. The beautify old ladies of the lough make the Bottom Up Boats crew smile every time we glide by them on the race course. Her lines are timeless with her big boom holding out a main that powers her along in any conditions. The team at bottom up boats hope you are enjoying some of the sort clips from our 2025 racing season. Not long now until the boats are in the water once again. Bring on the 2025 summer of sailing.

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We sometimes dance gracefully around something that we don't really understand. The good thing is that we don't have to understand everything! There is so much intelligence out there ... Let's leave it like this.

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Svensexa för Jonas Nilsson, arrangemang Sailstar

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