We were amazed as we entered the Dardanelles Strait in Turkey. Along the coastline there was so much going on: ferries, trains, towns, and monuments. It almost made you forget to look at the water — until suddenly large dolphins started leaping in front of our bow and diving through the bubbles created by the front of our catamaran hulls.

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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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