djcheburashka
Contributor
Victor: chill. It's true that dir folks use the phrase "balanced rig" to mean getting the weight right. I don't think that means they have a copyright on the word "balance"
Anyway, when you say body trim is a two-axis proposition I think you mean that rotation around the vertical axis isn't part of it. True, but the location of the vertical axis along the body is part of trim.
Air trapping absolutely matters, both for control of position in the water column, and the balance of buoyancy (since you don't like "balanced rig") front-to-back and side-to-side along the divers body.
If gas in the bag isn't evenly distributed and doesn't find the highest point of the bag, the gas gets trapped in pockets of buoyancy that affect the divers position, and where it's a pain and an extra task to clear the gas. That happens in any rig where bungees constrict the wing-it's basic!
As for edd and putting weight on the back of tanks... I think there's been a lot of explanation elsewhere of why that's a terrible idea, so I won't repeat it. I hadn't heard before that he's still putting weights on the back of al tanks. Frankly I think it makes me rethink his credibility about any of it.
Tbone: none of the manufacturers going with it? Dude... The razor (no buttplate). The stealth (buttplate optional, suggested for steel tanks only). The contour (buttplate optional, function a mystery). The sms75... That wacky UTD rig... Like I said you're way out of date with this stuff.
Regarding when al tanks become positive--you're right, but the numbers change when you include the valve and first stage. Anyway, wasn't it you who said you don't adjust the rear of the tank down until you get to around 800psi? My point was to adjust it way sooner-I usually do it around 2000, whenever I reach back and feel that the rear has gotten floaty.
Anyway, when you say body trim is a two-axis proposition I think you mean that rotation around the vertical axis isn't part of it. True, but the location of the vertical axis along the body is part of trim.
Air trapping absolutely matters, both for control of position in the water column, and the balance of buoyancy (since you don't like "balanced rig") front-to-back and side-to-side along the divers body.
If gas in the bag isn't evenly distributed and doesn't find the highest point of the bag, the gas gets trapped in pockets of buoyancy that affect the divers position, and where it's a pain and an extra task to clear the gas. That happens in any rig where bungees constrict the wing-it's basic!
As for edd and putting weight on the back of tanks... I think there's been a lot of explanation elsewhere of why that's a terrible idea, so I won't repeat it. I hadn't heard before that he's still putting weights on the back of al tanks. Frankly I think it makes me rethink his credibility about any of it.
Tbone: none of the manufacturers going with it? Dude... The razor (no buttplate). The stealth (buttplate optional, suggested for steel tanks only). The contour (buttplate optional, function a mystery). The sms75... That wacky UTD rig... Like I said you're way out of date with this stuff.
Regarding when al tanks become positive--you're right, but the numbers change when you include the valve and first stage. Anyway, wasn't it you who said you don't adjust the rear of the tank down until you get to around 800psi? My point was to adjust it way sooner-I usually do it around 2000, whenever I reach back and feel that the rear has gotten floaty.