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  1. DA Aquamaster

    blacktips uv

    You can add a wrap to it.
  2. DA Aquamaster

    Scubapro Sidemount - initial impressions

    As a side mount cave diver, I am very picky about tank position and profile. My major beef with the Dive Right ring bungee system is that the tanks are almost always low as the ring, bolt snap and quick link, along with the limited stretch and upward pull of the actual DR bungee system, limit...
  3. DA Aquamaster

    Scubapro Sidemount - initial impressions

    Yes, there is no need for the ring or link. You can loop the bungee around the valve knob, or around the projection for the burst disc assembly. I prefer to pull the loop in between me and the tank and then under the tank and around either the valve handle or the projection for the burst...
  4. DA Aquamaster

    New DPV - Dive Xtras

    I did get a shipment from Dive Xtras, so they are filling their back orders, and I do have a BlackTip in stock. Karst Scuba
  5. DA Aquamaster

    New DPV - Dive Xtras

    A pair of 9 Ah Waitley batteries will cost you $140. Three sets will still cost less ($420 versus $500) than a single set of DeWalt 12 Ah batteries. On the dives we did, I also still had 2 bars left. However we also didn't do a trip to the far end on the first dive like the other 2 divers...
  6. DA Aquamaster

    New DPV - Dive Xtras

    I was near the top of backorder list and just received a shipping notice this afternoon. The shipment should arrive on Wednesday the 25th. So...depending where you are on the list, yours could be coming soon as well. I do know they plan to catch up on back orders as soon as possible and it...
  7. DA Aquamaster

    New DPV - Dive Xtras

    The self discharge rate is very low on lithium-ion batteries and they store best at about half charge, since that is where the battery chemistry is most stable. Check the battery and if it's at 50% or above, just leave it on the shelf. However, you should check it every few months during...
  8. DA Aquamaster

    DPV tow cord install

    Talk to 10 different divers and you'll probably get 12 different opinions. My advice is to look at various options and understand the "why?" behind them, then make your own choice and try a few different methods in the water. 12/6 versus 3/9 tow cord position? As you've noted and others have...
  9. DA Aquamaster

    New DPV - Dive Xtras

    It comes with practice. Over time you'll get good at estimating how much air you need to add to or remove from your wing and dry suit - and counterlung in the case of a CCR diver. You'll focus on the major depth changes first, then you'll also get good at recognizing and correcting for the...
  10. DA Aquamaster

    Blacktip Scooter- Limited To Weighting, Buoyancy and Trim

    That's the primary reason I am using 9 Ah Waitley batteries in caves. They allow enough reserve buoyancy for me to weight a BlackTip 2-3 oz positive, which ensures it stays off the floor when placing a jump, etc. As noted in a prior post, in some situations it works well to place the DPV...
  11. DA Aquamaster

    Blacktip Scooter- Limited To Weighting, Buoyancy and Trim

    We covered some of the basic open water DOV skills, but there are some more open water skills to cover, and there's a LOT more to learn in terms of technical and cave DPV use. Published standards vary, but a tech or cave DPV course should be no less than two dives per day for a minimum of three...
  12. DA Aquamaster

    New DPV - Dive Xtras

    I also had 9 Ah batteries installed. On the first dive, I had about 20 minutes on the trigger, mostly at speed 4 or 5, but with a brief burst at 8 while I followed Stuart who I suspect was going "Whoooo!". Dive 2 was almost entirely at speed 2 or 3 as we went all the way around the lake. I...
  13. DA Aquamaster

    New DPV - Dive Xtras

    As discussed the other day, I intentionally left my 9 AH batteries in after doing some testing Wednesday evening (ending at 9pm) when they were at 22%, and noted a drop to 8% by the time I removed them to charge on Friday (at 6pm). That's a 14% drop in 45 hours, or roughly 7.5% per day...
  14. DA Aquamaster

    New DPV - Dive Xtras

    Exactly. Given the cut off point around 20% (for the Waitley batteries at least, for dive planning and battery monitoring purposes, the takeaway for BlackTip divers needs to be that as soon as they no longer see 2 bars, they are very close to the end of usable battery charge. Having 1 bar...
  15. DA Aquamaster

    New DPV - Dive Xtras

    Depends on how you plan to use them and where you want to spend your money. Apples to apples a pair of 9Ah Waitley will only give about 80% of the run time of a pair of 9Ah DeWalt batteries. In turn apples to oranges, a pair of 9Ah Waitley batteries will only give about 60% of the tun time of...
  16. DA Aquamaster

    New DPV - Dive Xtras

    In my experience, running 9 AH waitley batteries to the point the BlackTip stutters, the battery indicator on the scooter still showed 1 bar, and the battery percent indicator on the batteries still read 20%. Unlike a Piranha running up around 75%, where you can reach the stutter point, then...
  17. DA Aquamaster

    Is the Scubapro MK10 a balanced piston 1st stage?

    Exactly, the larger piston head reduces the change in IP. It's a major reason Scubapro went back to the larger piston diameter on the Mk 15, and the subsequent Mk 20 and 25.
  18. DA Aquamaster

    Dive Xtras BlackTip in a cave

    The center of gravity on the BlackTip is right around the rear of the main body tube, while the center of buoyancy is just about in the middle of the tube. The caveat here is that I derived this based on weights and moment arms of each component and then calculating the CG (using the rear of...
  19. DA Aquamaster

    Is the Scubapro MK10 a balanced piston 1st stage?

    The pressure acting on the piston stem acts on the full diameter of the stem. The pressure acting on the area of the inside of the seat is acting on the diameter of the piston inside the knife edge of the seat where it contacts the seat. That's a finite but still measurable difference in area...
  20. DA Aquamaster

    Dive Xtras BlackTip in a cave

    It's a work in progress. I get that Dive Xtras wants to maintain some separation between the $1499 Blacktip intended for the recreational market and the $4995 Piranha P1 and the $6195 P2 intended for the technical diving market. However, there's a lot of potential sales to be found with...
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