Inspiration or Evolution?

Mark Chase

Yes the evo is significantly lighter by about 10kg I beleive.. Check their site. I can confirm that its a much nicer unit to dive than the Classic in terms of weight and drag in the water.

However for tec diving and scrubber duration issues I would opt for the Vision and a travel frame.

ATB

Mark Chase

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nigelh

But the walls in a chamber full of 'lime are imaterial. That would only work for laminar flow in a pipe. The gas is filtering through tiny gaps the whole time. The "walls" here are the edges of the grains.

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nigelh

decoweenie

Agree.

However, near the wall or the center rod, one surface is completely walled whereas the rest of the surfaces (as seen by the single air entity) has "porosity" with wall and open spaces.

Therefore, I think there is still more drag near the scrubber housing or the center rod.

But then, by the same argument, it shouldn't be a cone shape right and more of a parabolic as seen radially from the center outward ?

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nigelh

I'm not sure. If I introduce an imaginary cylinder in the 'lime there is as much gas permeating outwards through it as coming in (equal pressure) so in effect replacing it with a solid wall should make no difference. but they are smooth while the lime is anything but. Should that be less drag? I'm struggling to make a model in my head that gives anything more than a flat front, naturally becoming statistically less flat as it progresses. I'm not sure but I think you could make a case for gas permeating sideways flattening the front.

I really should be doing some work here....

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nigelh

CCR900

A think one or two studies have already looked at the issue, my point was not to question the quality of the 2 hour limit of the scrubber (3hrs in the case of the Inpsiration) but more to ask whether it is worth try to push it any further....

F

Explorer

Yesh. Just buy one of each and then you are done.

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decoweenie

Fil,

It depends on your risk tolerance level.

We know the conditions which the units were tested, and the duration for which the manufacturer rated the scrubber based on those conditions. No question there!

If you are diving the unit under the same conditions, it would be stupid to push the duration beyond the rated duration.

If you are not diving the unit under the same condition, then it goes back to your risk tolerance level. Right ?

Some people are comfortable when within their "safety" comfort zone. And some other people have a larger comfort zone.

For example, you ride a fast performance motorcyle which I am sure some people will consider to be risky business, but it is well within your comfort zone. And I enjoy sky diving which is also within my comfort zone, but I am sure is not for everyone else.

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CCR900

Phi

Point taken.

F

nitrojunkie

Not too many pixels to count across, I don't have it in front of me but if i remember correctly it may be divided into 6 levels. After having the opportunity to trigger the alarm in strong currents while pushing the limits on the time I have pretty figure at 50% dump the sorb if you anticipate doing another technical dive.

As for the placement of the temp stick, this is beyond my level of understanding to answer, some folks seem to have thoughts on it.

Essentially the temp stick is a good tool to help you understand what's happening to your sorb. It seems to be the best tool we have at this point until a proper CO2 monitor comes along. I would love to have and would happily pay for both if possible.

The most important lesson I felt I have learned from the temp stick is NOT to overly trust it. Simply use it to make sounder decisions. The interesting part of this was that I felt fine, no Co2 "issues" that I could identify...so my sense is that there is a reasonable amount of "safety" built into APD's implementation of the alarms and monitoring. Just recognize that conditions change and one should always plan to have more than enough time to work it out.

In reality I usually dump my sorb after a second dive, if they are deep, and I would certainly consider diving it for 3 or 4 dives if they were shallower/shorter duration and the temp stick indicated there was reasonable scrubber left. Just remember to look at the scrubber gauge before you ascend, it can "recover" a fair amount on deco, so at the 20' stop it may look like it has a longer bed than it had on the bottom portion of the dive. If anything could be improved with the temp stick that might be were one could build a better mouse trap, giving the diver some sort of indication of the worst case of the scrubber at depth. This might also be enhanced by a higher level of granularity to the graph as you seemed to be inferring in your question.


Doug

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nitrojunkie

As for a travel frame.... how about one that is really designed to travel, fit my tiny evo scrubber, NOT built for the bigger insp/hh combo, that's wasted space and weight. I liked the idea of a collapsible frame to give it back height when in use - ultra small for traveling but it shouldn't be longer than the current evo box when collapsed, maybe even shorter... I would buy that.