Snow booarding and diving

[motatoad]

I thought id ask the masterminds of YD
How long are you supposed to wait after diving before you could go riding a mountain as i dont think you allow the same time as flying because your nowhere near as high,
and how long after been high on a mountain can you go down under the ocean
the mountain im talking about is 6000 feet above sea level

i ask this because im in too nice of a place within 30mins of the mountain top
and within 30 minutes of dive sites so depending on the weather i have choice aswell as oppurtunity to surf too

[MCFastybloke]

its the law that you cant mix ya sports in the same week so plan ahead and check ya e mail.Did you get that flashy torch yet?

[chrisch]

Originally Posted by motatoad

...
i ask this because im in too nice of a place within 30mins of the mountain top
and within 30 minutes of dive sites so depending on the weather i have choice aswell as oppurtunity to surf too

Wow. Cool. Where in West Yorkshire is this??

The answer to your question depends on which tables or computer algorithm you use. The USN tables have a "how high can you go for a given finishing group" table. BSAC 88s also allow this calculation.

Computer manufacturers usually state 12 hrs.

GUE think its pretty much a non-issue.

DAN are spending thousands researching it.

Take your pick which you want to believe. Where's the nearest pot? How "clean" is your deco? How good is your DCI diagnosis - esp. if you hurt yourself boarding?

Don't expect a straight answer.

Chris

[ardhill]

Originally Posted by motatoad

How long are you supposed to wait after diving before you could go riding a mountain as i dont think you allow the same time as flying because your nowhere near as high,
and how long after been high on a mountain can you go down under the ocean
the mountain im talking about is 6000 feet above sea level

Well, your right that you are not as high up a mountain as you will be in a plane, but that's not quite the issue. The issue as you know is to do with pressure - the higher your go, the less atmospheric pressure you experience.

But here is the cruncher... when in a commercial plane, the aircraft is actually pressurised. It isn't pressurised to ground pressure (about 1,000mb) but it is pressurised above the actual pressure of the atmosphere at that level. Someone will be able to tell you what they are pressurised to, but my guess would be to something like the pressure you experience up a mountain!

If it were me, I would use the same guidelines for going up a mountain as I would for flying.

Originally Posted by DAN

* For a single no-decompression dive, a minimum preflight surface interval of 12 hours is suggested.
* For multiple dives per day or multiple days of diving, a minimum preflight surface interval of 18 hours is suggested.
* For dives requiring decompression stops, there is little evidence on which to base a recommendation and a preflight surface interval substantially longer than 18 hours appears prudent.

HTH
.

[P B]

From what I remember, and it's a bit hazy this time on a Saturday night, a modern Jet is pressurised to about 6000 to 8000 feet.

ATB

Paul

[GLOC]

Sometimes higher, depends on how high the aircraft has to fly. It is all to do with pressure differentials between the inside of the airframe and the outside.

Some blah for you to read

Regards

[Scuby]

I'd go pretty much with Chris's answer - depends on which tables you use.

In general, *personally*, i'd leave it til the next day - if I dive one day, I wouldn't go back up a mountain til the next day.

However, with everything it's a question of degrees - if you're using nitrox but doing deco as for air, or if you're getting nowhere near deco limits, or you're only doing a 6m bimble, then you could probably get away with doing both in the same day.

Unfortunately only you can decide how conservative you want to be, and if you dive using a computer (like most of us) then that'll probably be of no use at all - my Vyper certainly has absolutely no idea about altitude or anything. But in absence of any other guidance, the next day (18-24 hours) should be fine on pretty much any profile on any table.

David

[simon1574]

Hey Scuby how about doing it the other way round snowboard in the morning and dive in the afternoon that way you should have no problems as you are going from low to high pressures just be aware high altitudes can dehydrate you.

Have a good one and stay safe

[Aquatic Mammal]

I gave it about 12 hours after diving (on Nitrox 32) before going up Mt Sinai and felt no ill effects at all. Had the hill in two and a half hours, not bad for a knackered old sod!

[motatoad]

Yep ive climbed mount sinai too
no wander moses started illucinating and seeing burning bushes after climbing those 3500 bloddy steps, quite a hike am tellin tha