Deco on the Pie (DOTP)

[Janos]

Ok,

As requested by Woz, I've been having a bit of a play around at working out some Deco on the Pie. Using Air and 50%, I came up with some rules that sort of mimic Bulhman with 20/80 Gradient Factors. Well I think they do. Have a look at see if I'm right.I could be wrong. Indeed I probably am.

Remember, this is for Air and 50%, in the range 20m to 40m.

Rule 1) Always do a three minute stop at 6m
Rule 2) Always do a 1 minute stop at 18m (the Pye stop) and switch to 50%
Rule 3) The "Pie time" at 30m is 20mins
Rule 4) For every 5 minutes above this, do 5 mins of deco
Rule 5) For every 3m deeper (shallower) add (subtract) 5 mins to the pie time.
Rule 6) If you're deeper than 30m, and staying longer than 30mins, then add on a couple of minutes extra "for luck" deco
Rule 7) Roughly 3/4 of your deco is at 6m
Rule 8) Roughly 2/3 of the rest is at 9m
Rule 9) If you're doing more than 20mins of deco, then do 1min stops every 3m from the Pye stop up.
Rule 10) If you're diving below Sports Diver depths (ie 36m plus) then you will need to add in super-Pye stops at 21m.
Rule 11) If you calculate that you need more 25mins of deco, or so, then you're out of the range of rules 1 to 10.

Example: 35mins at 33m

Pie time at 30m is 20mins
So pie time at 33m is 15mins.

Therefore (bottom time - pie time) = (35mins - 15mins) = 20mins of stops.
Add a couple "for luck"
Gives 22mins of stops.
3/4 of this is at 6m; so 16ish.
Remainder is 6mins. 2/3 of this is 4mins so 9m stop is 4mins
1 min at 18m (the Pye stop) leaves 1min left so...

1 min at 18m
1 min at 12m
4 mins at 9m
16mins at 6m

Whereas Bulhman 20/80 gives 1@18, 2@12, 3@9, 15@6 so we're there or thereabouts.

Janos

[1] - Named after Richard Pye, a lover [2] of fish pie.
[2] - Yes. That sort of fish pie. Allegedly.

[Woz]

That's Top Banana. Can we rename the "for luck" minutes "gut minutes". And what about the "beard stop"? And if you lose your fiddy I assume you double the DOTP stops?

[finbar.taylor]

you clearly have too much time on your hands!

[Janos]

I did it on the train last night. It didn't take long. It might not be right though...

Janos

[NotDeadYet]

I did it on the train last night. It didn't take long. It might not be right though

You have to deco on the train?

[Okeanos]

Deco on the Loco, more like it.

[Janos]

You have to deco on the train?

Yes. It's far more sensible than doing it at the end of the dive. I save it all up at the weekend and then deco for about an hour, hour and a half each day on the train. It passes the time, normally I get a seat, and the Sudoku doesn't get soggy.

Janos

[Scuttler]

Can we change it from Fish Pie to Pork Pie? I'm not mad keen on fish pie....prefer my fish with heads on and everything.

[MartyC]

Janos,
How irresponsible of you to advocate Pie Stops, are you not aware that they can be extremely dangerous to your health?
Pie stops can create extreme thickening of the waist area, leading to ill fitting of dry / wet suits with unsightly bulges, also they promote doubling of chins leading to difficulties with neck seals.
Shame on you.

[Janos]

Can we change it from Fish Pie to Pork Pie? I'm not mad keen on fish pie....prefer my fish with heads on and everything.

I too prefer pork pies to fish pies. Both on health and taste grounds. But Richard Pye is a famous ichthyologist. I think that means he's a fish pie lover [1]

Has anyone found any mistakes in DOTP yet? I can't believe it's all correct. Go on. Try a profile [2] and see if it works

Janos

[1] - Not that sort of lover.
[2] - Ie work out what stops you would do. Don't dive the dive. That would be silly.