Advantages to Imperial units

[w3dge]

Just remember, there are two types of countries, those that use the metric system, and those that have put man on the moon......

True, its just that the rest of us have progressed some since 1972

 

[Dan]

I have wondered how you signal remaining gas in psi units, I'm now getting an idea. It'll be interesting if/when I get to dive stateside, could get confusing! Another advantage of metric, although still not as efficient as Jeffs (until you get down to 50bar)

DM in Galápagos gave a briefing & telling us to signal with fist on chest when we reached 50 bar or 1000 psi. I told him: "I wish my SPG were displayed in bar. You just short change my dive time". He gave me a puzzling look.

In the end it didn't make much of a difference. My SAC is about 0.4-0.5 CFM. He started sending those air-hog divers to the surface 2 at a time. He & I were last to surface in most of the time.

 

[VR78]

I'm going to invent my own scuba units. I'm going to call them Jeffs

My group has been using a Jeff-like unit of measure for a while now, as a mental backup for SPG readings. We consider our twinsets as "x-bar tanks", based on their volume and our individual RMV/SAC. Basically, my D12 (similar to twin HP100) is my "4-bar tank", meaning that in a 5-minute interval on the surface I use 4 bars. This corresponds to 19 lpm/0.67 cfpm and has an intrinsic conservatism of about 15%. Now this means that all I need to calculate my consumed gas in real time is to look at my bottom timer. 20 min at average depth of 25 m gives (4 five-minute segments) * (3.5 ATA) * (4 bars per segment) = 56 bars. If I see a large discrepancy between this calculation and my SPG reading I reevaluate the dive and make adjustments (have a team member do a bubble check for me, slow down, check breathing pattern, add gas to suit to get warmer, change dive plan).

(BTW a three-Jeff system is a keystone of cave diving, isn't it?)

 

[RayfromTX]

Just remember, there are two types of countries, those that use the metric system, and those that have put man on the moon......

Even back then, the people that put men on the moon didn't use imperial units to do it. Your post is still worth a chuckle.

 

[VR78]

Even back then, the people that put men on the moon didn't use imperial units to do it. Your post is still worth a chuckle.

...and then there was the Mars Climate Orbiter...

 

[UFOrb]

Because ordering half a litre of beer just isn't the same! At least you get to order a litre of beer in Germany, I suppose...

I'm pretty sure you cant get a decent IPA in Germany though!

 

[w3dge]

I'm pretty sure you cant get a decent IPA in Germany though!

True, but some of the strong beers in Bavaria... omnomnom!

 

[seeker242]

Now before you say "WHAT?!? Way too early!" -- I say: this is what works for me

Would it still work for you if your buddy is breathing the same tank? I think that's the important question!

 

[Dan]

It's interesting to learn that the Brits came to the States introduced their weird Imperial units (feet, pounds, Fahrenheit, etc.), went home, converted their own to SI units & left us confused. Thanks!

 

[Neilwood]

It's interesting to learn that the Brits came to the States introduced their weird Imperial units (feet, pounds, Fahrenheit, etc.), went home, converted their own to SI units & left us confused. Thanks!

You guys decided to fall out with us so we left you with them...