fixed setpoint EAD formula

**UWSojourner** · 29th May 2007, 20:31

Quote: (Originally Posted by wedivebc)

OK I am running numbers through almity's and nigel's formulae and coming up with the same result. What am I missing?

Not sure. Post an example of both and it'll probably reveal itself.

**almity1** · 29th May 2007, 21:36

Quote: (Originally Posted by wedivebc)

OK I am running numbers through almity's and nigel's formulae and coming up with the same result. What am I missing?

So you should

If you do the maths thing to reduce or streamline the formulae from what I have given you, it will end as nigel's formaulae.

If I had a whiteboard I would show you.

Let me see if I can get a graphic going.

**UWSojourner** · 29th May 2007, 22:07

Ok. See where you differ from this example.

Example: 30msw @ 1.2 PO2 (bar)

DepthInBar = Depth / 10

First formula:

EADInBar = ((30+10)/10 - 1.2)/0.79 - 1 = 2.5443 bar

Second formula:

LazyEADInBar = (30/10 - 1.2)/0.79 = 2.2785 bar

Difference (as noted in post above) = 0.2658 bar

dantheman · 30th May 2007, 04:44

Quote: (Originally Posted by nigelh)

Read the post.

Post (and your page, BTW) read and understood.

You omit the surface atmosphere. That's the "lazy" part. Check.

As Kevin is explaining above, there is a real, however slight
difference. This I acknowledge as essentially inconsequential
with my "for something like EAD" comment. Check.

Is that clear now, or should I have used 2 smileys?

--dan

29th May 2007, 20:31	#11 (permalink)
UWSojourner Pacific Northwest Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Feb 2005 Location: Portland Oregon Posts: 563	Re: fixed setpoint EAD formula Quote: (Originally Posted by wedivebc) OK I am running numbers through almity's and nigel's formulae and coming up with the same result. What am I missing? Not sure. Post an example of both and it'll probably reveal itself.
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29th May 2007, 21:36	#12 (permalink)
almity1 No Viz is BAD Viz Current Rebreather/s: Megalodon Other Rebreather/s: Evolution Prism Topaz Sport Kiss Optima Join Date: Aug 2006 Location: Sydney, Australia Posts: 176	Re: fixed setpoint EAD formula Quote: (Originally Posted by wedivebc) OK I am running numbers through almity's and nigel's formulae and coming up with the same result. What am I missing? So you should If you do the maths thing to reduce or streamline the formulae from what I have given you, it will end as nigel's formaulae. If I had a whiteboard I would show you. Let me see if I can get a graphic going. __________________ Cheers almity1 - http://www.almity1.com
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29th May 2007, 22:07	#13 (permalink)
UWSojourner Pacific Northwest Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Feb 2005 Location: Portland Oregon Posts: 563	Re: fixed setpoint EAD formula Ok. See where you differ from this example. Example: 30msw @ 1.2 PO2 (bar) DepthInBar = Depth / 10 First formula: EADInBar = ((30+10)/10 - 1.2)/0.79 - 1 = 2.5443 bar Second formula: LazyEADInBar = (30/10 - 1.2)/0.79 = 2.2785 bar Difference (as noted in post above) = 0.2658 bar
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30th May 2007, 04:44	#14 (permalink)
dantheman Emoticonoclast Current Rebreather/s: Sport Kiss rEvo Other Rebreather/s: Classic Kiss rEvo Join Date: May 2005 Location: NorthEast USA Posts: 397	Re: fixed setpoint EAD formula Quote: (Originally Posted by nigelh) Read the post. Post (and your page, BTW) read and understood. You omit the surface atmosphere. That's the "lazy" part. Check. As Kevin is explaining above, there is a real, however slight difference. This I acknowledge as essentially inconsequential with my "for something like EAD" comment. Check. Is that clear now, or should I have used 2 smileys? --dan
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