Re: [Fledgling] Custom DBS
Fledgling wrote:
I'm not sure I have ever heard a single person say custom DBS are "bad".
I have. I think that the primary reason is the one JP pointed out--there are way too many people who have "customized" DBS by simply putting in a super deep setting without appropriate testing, and thereby have given themselves a canopy that stalls, backslides or just sinks out at opening. The real danger is that such a canopy is usually unresponsive to riser input, and a canopy that cannot be turned after opening is more or less useless.
In reply to:
The most common debate is whether or not they are actually necessary.
Unfortunately, the answer to that depends on the jumper, their canopy, and their physical dimensions. Which means the only real way to find out if they are necessary for you is to test them.
I've customized a lot of DBS now, for a lot of different people. I don't have any good statistical data, but my gut feeling is that about 1 in 20 people don't require any customizing of their DBS beyond the factory settings.
I've encountered 5 canopies where the factory DBS was too deep (gave no riser control) and had to be lightened for a custom DBS. Those cases were very scary to me, and if only for finding those cases, I think it's worth testing the DBS for every jumper.
I have also observed dramatic differences between the "depth" of the factory settings from various manufacturers. Apex, for example, has settings that are the closest to "custom" on most of the canopies I've worked with. The canopies I've had to "deepen" the brakes the most have been Atair canopies, with CR canopies somewhere in the middle. But note that the high rearward speed of the Ace/Blackjack airfoil in a parachutal stall means that it's easier to move it backward than almost all of the other canopies on the market, meaning that a shallower brake setting works well as custom on those canopies.
Adjusting brake settings is _a lot_ more complex than most people realize. It's scary to see people who just throw in some random super deep setting and say "well, it opened a couple times off the bridge, so I'll run to Moab with it." You're definitely better off with a (fairly conservative) factory setting than with an overly deep, botched "custom" setting.