Posts by dustyyoungblood
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Entertaining.
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Nice work. Carbon looks proper. Thanks for sharing
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So Jealous! Looks like a fun trip!
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I also, had been confused by this "Open Cell" label.
I might consider labeling your suits "Freedive", then explain in your description that they are unlined.
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Hey Jerry,
Good to see you here. We have a good network of fine folks on this forum. Enjoy! -
I enjoyed your Ab film. I kept thinking.... once he get's past the washing machine inside reef, it should clear up. But no! Of course the chosen reef is right in the middle of the mess. Good effort. Much more man then me.
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She is missing a shaft. I hear Don has one he can lend her
Good call. Not much good without a shaft.
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Welcome, and thanks for the legends event!
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tell me about your roller gun. looks cool.
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The shot after 4:40 is really sweet.
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Nice! Bug dreaming here!
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Thanks for sharing!
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Maybe we need a speargun that bolts to a kite board?
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Nice! looks like fun. Itching to dive now.
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Rad! So Jealous.
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As for water, well that is what an ice skater slides around on under the blades of their ice skates, the squeeze film supports their weight to reduce friction on the ice.
Well, as a speed skater in my high school days.... you have used an analogy that I can relate to
Now, even in a "loose" enclosed track, where some shaft whip is occurring, and perhaps the track is a bit warped also...... can we imagine the squeeze film still acting in places along the track, even just for an instant, as the shaft is forced to contact the track? I picture a shaft kind of bouncing around in the track as it accelerates, but the squeeze film does what it can to cushion the shaft as it moves forward, reducing impact, kind of like Magnetic Levitation....
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pretty interesting idea.
my first two thoughts are that it will be loud, metal on metal.
Yes, probably loud.
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Under ideal conditions a squeeze film might form and in the field you may see a partial squeeze film but I dont think this happens in most if any guns. Another problem with the squeeze film model is that it requires the shaft to move parallel to the track but it is known that on overpowered guns (one of the big reasons people choose enclosed track) and even normally powered guns the shaft flexes and does contact the track walls.
Good insight. "Ideal" is a situation we never have in spearfishing. So many variables.... not to mention the direction that the bands are pulling on the shaft.
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The squeeze film is the result of the velocity differential across the thin fluid film, say the enclosed track being stationary and the shaft accelerating inside it. Point or linear contacts at three points on the shaft will have more friction, not less.
So, in an enclosed track with a circular cross section, and in very close tolerance to a shaft with a circular cross section, then we have a squeeze film of water between them. During acceleration then, is the shaft perhaps not contacting the track at all? But just gliding in perfect equilibrium inside the enclosed track? If that is the case, then using a low friction plastic is not relevant. The only important feature of the enclosed track will be it's shape/size/accuracy of fabrication.
