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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The Fishermans Knot is a simple but effective way to join two lengths of rope together. The knot is more secure than a sheet bend under light load as you can tighten the overhand knots around the main lines which prevent the knot from coming undone before load is put on the lines. The Fishermans knot is preferred to tying a sheet bend when the rope diameters are the same. If you are going to have constant high levels of load on the joined lines the Fishermans Knot will become hard to untie, if you are join ropes which will stay under constant load are Sheet Bend will work better. Learning how to tie a fisherman knot is easy, most people already know how to tie a overhand knot, the Fishermans knot is tied by combining two overhand knots. Click the link below to learn how to tie a overhand knot. https://youtu.be/5z3BR2vCTcc Some sailing use cases for the Fishermans Knot include :- * Joining Jib sheets together to make them continuous * Joining Spinnaker sheets together to make them continuous. * Joining rope that have broken together in an emergency * Making a short rope longer Thanks for visiting the Bottom Up Boats channel, we hope you enjoyed this short video and you learnt a new skill that will help you with your cruising or racing. If you did remember to subscribe to ensure you get notified of our future sailing videos.

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Sim: dava pra fazer 5 ou 6kts… mas eu quis 2,5 😂. Porque não era pra chegar rápido — era chegar na maré certa. Se eu correr, chego na baixa e aí o risco de um acidente é enorme. 🎥 Episódio completo: #SAL 404 #SAL #HashtagSal #Veleiro #Maré #Calado #Navegação #Aracaju

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SUBSCRIBE OUR CHANNEL https://www.youtube.com/c/theboatshow/?sub_confirmation=1

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Our babies are here! 🐣🐥🐓We are enjoying our girls tremendously while we are rebuilding our sailboat @SailingGlacierGem

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