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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Just some quick cuts from the rabbit start for the 5O5 Worlds in Aarhus, Denmark July 2010

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https://www.scanboat.com/en/boat-market/boats/motorboat-nidelv-24-17472375 Motorboat - Både sælges, Nidelv 24, 1981 EUR 4.500 Scanboat Stable, good and well maintained utility boat. "Bulletproof" Volvo 2-cyl diesel engine has only run about 20 hours after total overhaul. Inside, the boat is foiled on most painted surfaces with quality foil that does not come off easily and new vinyl flooring has been laid. Comes with full equipment such as platform and ladder, cooking torch, Wallas 2400 cabin heater with new overhaul kit included, but has now been removed from the boat, fenders, dredges, rock wedges, complete lines and mooring equipment. The fence is intact and neat and the seams were redone in 2019. There are milled grooves in the row around the rear...

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