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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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http://features.boats.com/boat-content/2013/07/53952/ For more how to videos, visit www.boats.com. Different people have different opinions on the best way to cleat a line. The way that I'm going to show you today is a safe way to do it; it will hold. First, take a full wrap around the cleat. Then criss cross it twice. Finally, turn the line in your hand so it wraps over top of itself, and pull it tight, once on either side. There you go! That will not come loose.
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