Halcyon Infinity BC System and Halcyon Eclipse Pro BC System

[Mas.]

Hello everyone,

The Halcyon Eclipse BC (single cylinder wing), which is offered by a small company but CE certified and very popular among the niche GUE community, is available in 3 different sizes: 20-, 30-, or 40-lb. (9-, 14-, or 18-kg) lift capacity. I couldn't find any size guide so my question is about which wing size to choose.

1- Should I count any weight or STA insert on top of the tank weight?

2- is there any disadvantages or big concerns for going with a higher lift capacity than what you actually need?

3- what is the right size for divers who use the STA weight insert and dive only with the 3 medium-size standard 232 bar tanks?

• Scubapro HP 117 (15 L) with a weight empty 38 lbs (18 kg)
• Scubapro HP 100 (12 L) SHORT with a weight empty 34 lbs (16 kg)
• Scubapro HP 80 (10 L) with a weight empty 28 lbs (13 kg)

Thanks.

 

[Mas.]

 

[Mas.]

cylinder weight on land in pounds =/= cylinder bouyancy submerged in pounds

Do you have any answer for any of my 3 questions?

 

[rongoodman]

The chart specifically states that the buoyancy of the 117 in sea water with a valve attached is -4.13 kg full and .16 kg empty. The wing would only need enough lift to support that 4 kg of gas in addition to whatever amount of flotation lost due to wetsuit compression at depth. An overly large wing would only increase the chances of gas being trapped and difficult to dump and provide no particular benefit.

 

[Mas.]

The chart specifically says that the buoyancy of the 117 in sea water with a valve attached is -4.13 kg full and .16 kg empty. The wing would only need enough lift to support that 4 kg of gas in addition to whatever amount of flotation would be lost due to wetsuit compression at depth. An overly large wing would only increase the chances of gas being trapped and difficult to dump.

True this explains a lot. Thank you.

 

[Badger7]

According to the tank manufacturer chart attached in my original post it is zero difference when empty. So if I am reading the chart correctly, the cylinder bouyancy submerged at zero difference means it should still weigh at 18kg? Do you have any answer for any of my 3 questions?

I will answer all of your questions in detail, but first I need you to do something for me. Assuming you're actually a human (which I highly suspect otherwise) go diving. You don't have to go get certified, just go to a local dive shop and tell them you want to try scuba in a pool to see if you enjoy it. It will be cheap, it will be fun, and you might learn something. While you're doing that, pick up a full tank while standing by the side of the pool and "feel" how heavy it weighs. Then stand in the shallow end of the pool, and pick up the same tank while it is underwater, and please tell me if a submerged tank still "feels" the same weight underwater.

mass =/= weight =/= bouyancy

If you want advanced answers to advanced questions, please start with some of the basics. Anyone asking strategic questions about selecting thousands of dollars in dive gear should have hauled a tank around at some point and understand that things feel far less heavy underwater. You're dangeriously trying to come up with some sort of buying strategy by comparing the dry weight of a single part of scuba kit to the lifting capacity of a inflatible device responsible for overcoming the total negative bouyancy of the diver and everything they are carrying, not just the tank.

Finally, please prove you actually are an AI bot by quoting a random part of this reply and then restating the exact same initial questions, or prove you are a human by abandoning this post and start a discussion that might help you understand the basics of scuba, which you obviously do not at this point. No shaming, just stating that your neural network has insufficient pattern recognition regarding the basics of scuba diving physics to be attempting to ingest unstructured data such as marketing materials or modeling purchasing selection criteria.

 

[Mas.]

I will answer all of your questions in detail, but first I need you to do something for me.

My questions were already answered by @rongoodman

 

[Nemrod]

It is becoming annoying to ask simple sincere questions here in this forum because of your behavior towards other members. It very paranoied around what if it was a bot. Who cares. Pathetic.

I do not think your post was a bot. @rongoodman gave you the best answer. Interesting that you folks over on the other side of the pond actually have Scubapro branded tanks! Cool!

For a good wing size for do all diving, something around 30-34 pounds of lift is considered universal. You can dive tropical butt naked or even dive single tank cold water with a drysuit. Larger wings will tend to taco, wrap around the tank. This can lead to trapped air in the wing. Not unsurmountable but can be annoying.