PADI RDP question

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Ross567

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OK, first contact - lots to see here - I'm a novice, 3rd week of PADI OWD course, with aims of warm water diving rather than diving in UK .... I've a query on the RDP from the quiz - 'What is the minimum surface interval required betwen a dive to 20metres/ 70 feet for 29 minutes followed by a dive to 14 metres/ 50 feet for 39 minutes?' - This doesn't compute on the RDP so I am guessing that the safe option is at least 3hours - but is there a way to compute this? I'll tell you more about me on next visit .... Ross567
 
If you'd like some help learning the tables, a good resource is http://home.flash.net/~table/table/p0000088.htm - it's shareware (buy if you like for about $20) really helps you learn how the tables work -

Have fun and welcome to the ScubaBoard! :D

Aloha, Tim
 
MoonWrasse:
Did you read the instructions on how to use the tables? If you purchase the RDP separately, it comes with instructions and examples. Otherwise look at the OW book.
Yes, followed through, but doing that leaves a mismatch - hence maybe the question to emphasise safety times between dives I guess - safety sayes 3 hr minimum, maybe 6hrs - but not clear .... what would you do? Ross567
 
kidspot:
If you'd like some help learning the tables, a good resource is http://home.flash.net/~table/table/p0000088.htm - it's shareware (buy if you like for about $20) really helps you learn how the tables work -

Have fun and welcome to the ScubaBoard! :D

Aloha, Tim
Thanks Tim - looked at the download, good tool, tho' it doesn't allow input of dives to see what happens - does confirm my knowledge and working of PADU rdp which is fine ...... but this ? - I'd go for 3hrs minimum surface interval as safe [I asked another diver [experienced, claims no longer uses rdp - answer - prob about an hour ....]
 
Ross567:
Hi, hope for some help here - I am 3 weeks into OW training, looking at quiz 5 in the manual, and it's causing a problem - question - '1st dive 20metres/70 feet for 29 mins., 2nd intended 14metres/ 50 feet - how long a surface interval required?' - 1st dive gives PG M, 2nd from table 3 gives PG P - but the two don't intersect on table 2 - am I doing something wrong, or is this a no dive, or .... Ross567
Hi Ross567. How long is the 2nd dive at 50 ft.? Also I get pressure group N for 70'/29min. Jim
 
gypsyjim:
Hi Ross567. How long is the 2nd dive at 50 ft.? Also I get pressure group N for 70'/29min. Jim

Thanks Jim - I'm using PADI rdp - 1st dive rounds to 30mins on metric tables --> M - 2nd dive 14metres/ 50feet for 39mins - gives PG P from table 3 Ross567
 
Using my PADI table 3 you will get PG M for 50'/39 min. Go back to table 2 and follow M up till it intersects the horrizontal M from table 1. I get SI of zero to 4 minutes. If there is no intersection, as in say table 1 PG J and table 3 PG M, the answer would be the same basicly, no required SI. Does this help? Jim
 
gypsyjim:
Using my PADI table 3 you will get PG M for 50'/39 min. Go back to table 2 and follow M up till it intersects the horrizontal M from table 1. I get SI of zero to 4 minutes. If there is no intersection, as in say table 1 PG J and table 3 PG M, the answer would be the same basicly, no required SI. Does this help? Jim

Ah, my problem really - it doesn't sound right to have a '0' surface interval following that 1st dive followed by a long 2nd dive - altho' I can see that if 'P' is continued upwards from table 2 until it meets a kinda backward extended 'M' then it would indicate '0' time on the surface. Maybe I'm being over wary? What d'you think? Ross567
 
Ross567:
Ah, my problem really - it doesn't sound right to have a '0' surface interval following that 1st dive followed by a long 2nd dive - altho' I can see that if 'P' is continued upwards from table 2 until it meets a kinda backward extended 'M' then it would indicate '0' time on the surface. Maybe I'm being over wary? What d'you think? Ross567
Over wary? Carried to an extreme it would be a problem, but it sure beats unwary and impulsive, don't you think? A little extra caution is a good thing, and as you can see from my first answer this dive profiling is not exact: my PADI RDP listed PG N for 70'/29 min. which would have given a different answer, requiring a 4 minute to 8 minute SI given you dive 2 profile. This was a good exercize for me as I've gotten used to the computer, and makes me glad I'll be sitting in on my kid's OW classes in 3 weeks. Never hurts to do a refresher! Enjoy your diving, don't be afraid to be a little cautious: it wont get you in trouble, Jim!
 

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