Quote:
| Originally Posted by gingerstu Hi Guys,
Currently going through the course material for the PADI Basic Nitrox course and am stumped by this question:
EAD = (1-o2%) * (D+10) / .79 - 10
o2% = 32 (as decimal 0.32)
D = 17.2m
Therefore:
EAD = (1 - 0.32) * (17.2 + 10) / .79 - 10
=>
EAD = (0.68) * (18.2) / .79 -10
(0.68) * (18.2) = 12.376
12.376 / .79 = 15.67
15.67 - 10 = 5.67m
Now if only Nitrox did yield equivalent air depth of the above! Happy days indeed. Obviously this is wrong and the correct answer is 13.4m
I have used my method on other questions and have got the correct answer. I have also done an excel spreadsheet that produces the correct answer, but everytime I do it on paper with a calculator I always end up with the above answer.
Can anyone post my deliberate mistake? 
Cheers,
Stuart |
(1-o2%) / .79 * (d+1o ) - 10 = EAD
mix 32% depth dive 17.2m
1-.32= .68 / .79 *27.2 - 10 =13.41 (14m)