Ballet of constant ballast
Hi Pekka, allow me to list a few points? First and foremost, if your training to push limits, a buddy is important. Get a decent float, and at least 10 lbs of lead attached to the bottom of your line....25 or more is better, but be careful when you deploy the weights: you don't want to get caught in the line as it descends to the bottom. If you are diving in low vis, put a light pointing up at the bottom of the line, and maybe cylum sticks every 10 metres or so. I usually do 2 breath holds while I am suiting up, before I get in the water. Once your line is set, breathe up, exhale completely, then pull yourself down the line to maybe 5 to 10 metres, depending on how your ears take it...don't hurt them. Stay only for 10 to 20 seconds, then gently pull yourself up. Breathe up again, then one more. Breathe up again, then do your full inhale, packs, and whatever else you do, then pull yourself down the line to a fairly deep depth; maybe your target depth. Come up immediately, this is no place for static practice. Breathe up, relax, then do your constant ballast dive. If the vis is bad or it gets darker as you descend, then form an "OK" sign around the line with your hand. Form the ok sign as if you were signalling to a buddy on the bottom. The reason for this is that if you ever compete, you will only be allowed one handhold grip of the line to pull yourself up. If your ok sign is upside down, you might grab twice and be disqualified. When you reach your depth, grab the line tightly . Kirk Krack showed me how to "swoop" my hand with the guage down as far as possible at this point to get the best reading! In the same motion, pull yourself up. Put both hands over your head, behind your ears. Form a point with your hands together, and kick. When you are 1 or 2 metres from the surface, pull your arms down, and let the air begin to escape from your lungs....don't forcefully exhale, just let it out. When you breach the surface, immediately take a big breath, hold it for 1 second, and force it out through pursed lips, as if you were bearing down on the toilet (careful now!). Do 3 or 4 of those; they will help you resist blackout at the surface.
As for the speed, what you need to find out is the fastest speed that you can descend or ascend with the least effort. Perfect your entry, and work on hydrodynamics. Wear less weight for deeper depths. With a 5mm suit in the sea, I wear 8 lbs for diving below 30 metres. If you are weighted heavy, you will descend very easily, but at depth you will work like a bastard to get back up, bringing the possibility of SWB closer.
As you descend, you will be able to kick less and less, to the point where you wont need to kick at all. I stop kicking at -25 metres.
Conversely, when you ascend, you will kick harder at the bottom, and should be barely kicking at all by the time you reach -10 metres.
When you are done, get your buddy to pull all that weight up into the float while you recover from your dive! Just kidding, help your buddy, and be careful of the line again.
Hope that helps, I wish I knew this stuff last year.
Cheers,
Erik Young