PfcAJ
Contributor
Of course a 40 min bottom time at this depth is beyond most people, and well beyond the normal reach of OC divers,due to the gas volume required. The 40 min profile demonstrates how long ZHL/GF become badly out of proportion due to the extrapolation and GF compounding issue. No one needs that much extra time - look at the 100/100 plan !
If you ignore the GF expotential error in the 40 mins plan,which involves the Last stop only, then rest of the profile is all pretty similar. Go back and look at the more typical 20 min profile. A few minute difference only.
Argument being imagined here, here is they are pretending to "not' be doing deep stops. But in reality, the real world slow ascents (that are not actually planned), mean they are doing the deeper stops.
So they pretend to not to do deep stops, buy in fact really are. And if doing normal length dives, then the finish time about the same as a real VPM-B+3 plan. therfore... still doing a VPM-B style profile.
Well, since you brought up an OC plan, now, lets take a gander at how 'similar' they are.
240' for 40mins, 15/55, 35/25, 50%, 100%
40/70 = 137mins of deco, VPM+3 = 114mins.
4mins of stop time before the 1st switch with 40/70, 9mins with vpm+3.
68mins of oxygen vs 49mins of oxygen.
VPM has over double the amount of stop time before getting on a deco gas and 20mins less on oxygen.
I'm havin a giggle. We can do this all day. Even the 20min exposure has 4mins of stop time before getting on a deco gas with vpm+3 and 5mins less oxygen time.
Can we do another?!?! They're SOOOOOOOOO similar!!!