Quick test of a tiny QEV cannon firing air at 12atm, viewed through a Schlieren setup (no razor blade). Unedited at 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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there is a rainbow over Perfect Day at CocoCay this morning!!

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Romany sailing catamaran by Woods Designs www.sailingcatamarans.com. It is being sailed, in Florida, singlehanded (that's why the tack is so slow). The mainsail is not full hoist as the boom will later be raised to take a cockpit bimini Build your own ocean cruiser in ply/epoxy I also have a range of other multihull designs, both power and sail from 14-45ft that you can build yourself from plans

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