Dissimilar Tank Matching

[twaldo]

Ok I had a LARGE issue with this during Cave1, I just couldn't wrap my head around the issue.... I'm not a math whiz to begin with and it took sit down time with my instructor to get it all clear... In my free time I started working on an app in javascript to make it MUCH simpler. Was hung up for months on data collection based on a selected number of divers and finally Chris said "DUH, just do it for 2 divers" in a couple of hours I had it all roughed in. It still doesn't round like I want it to but check it out and let me know what you think. I plan on putting a pull down in for tank selection so you don't have to enter the basic info on tanks and the Team Factors is just stating the smallest amounts for the team.

Feel free to use it, share it, copy the code... After it gets all the tweaks I plan on porting over to Android and Apple platforms and putting all the tek calculations in one application.

It's at the bottom of the page.

http://www.springswildernessscuba.com/calculations

[twaldo]

Had a problem pasting the code into the page... its fixed now.

[Aotus]

awesome! well done!

I had to spend some time getting all that straight in my head too. I still like to spend a little extra time to do it slowly so I'm confident I don't F it up. This is a nice little code, but I suspect I'll still be doing it by hand and thick head in the water before the dive.

[twaldo]

awesome! well done!

I had to spend some time getting all that straight in my head too. I still like to spend a little extra time to do it slowly so I'm confident I don't F it up. This is a nice little code, but I suspect I'll still be doing it by hand and thick head in the water before the dive.

Give me time, it will be an app for your phone/tablet and who knows maybe even your dive computer in the near future.

Tim

[tbone1004]

I had run one up in Excel a few years back for up to 3 divers, was rather easy but did it to save time and more for pre-trip planning than anything. With sidemount I don't bother gas matching now, it is every man for himself. I always keep enough reserve for me in my left bottle to get out, but if you need it, you get to figure out how to get out on the right bottle. It's rather rude I guess, but in sidemount if you can't get out on your own gas then you did something really bad....

[FW]

... I'm not a math whiz to begin with and it took sit down time with my instructor to get it all clear...
http://www.springswildernessscuba.com/calculations

Not a math wiz? You could have fooled me

Of course, putting the smaller tanks on the diver with the highest SAC rate would solve the problem

[twaldo]

Not a math wiz? You could have fooled me

Of course, putting the smaller tanks on the diver with the highest SAC rate would solve the problem

Forrest,
I'm not. But give me a formula and I can put it into a program any day. Chris wants a modified version of this application that I believe calculates 3rds based on RMV of the diver with the highest RMV... Still have to look over the info he gave me, but just a matter of adding a few more calculations.
This one still needs to round up and down to the nearest 100 PSI and to drop the 44.4444444 down to 44.44 but I really wanted to get it posted (the app) because I've had it in my head since my initial issues with tank matching.

Tim

[twaldo]

in side mount if you can't get out on your own gas then you did something really bad....

Or something REALLY bad happened... I think it's more about catastrophic failure with side mount and air sharing.

[tbone1004]

send me a PM with your email address and I'll send you the excel sheet with my formulas later if you want to look at them. The only thing that should stop a sidemount diver from being able to use his gas are valve failures, no regulator failure should cause a diver to not be able to access the gas...

[kensuf]

If you're bad at math just print this, laminate it, put it in your wet-notes, done. If you need to add another size tanks, feel free to copy the contents into a spreadsheet, add your new tanks, and print it out.