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If you frog kick that much, look for another fin. I had the Seawing Nova's until I started frog kicking most of the time (90 pct or so). With a single tank setup it is doable but not ideal. With doubles you start to have problems. I bought some Hollis F1's after the doubles experience, and use...

I'm writing a paper and would need an approximation of the number of diving instructors in the world. A reference would be greatly appreciated. Thanks very much in advance.

No you cleared it up, this is a great answer to my question. I'll pick up that book you mentioned in the other thread and read it before bothering you guys again :) Thanks for taking the time to write such an extensive answer.

Thanks so much for the pointer.

I'm sorry, I didn't mean to burden you, it's just that it was your reg that I took apart, so it would have been easier to visualise. It is indeed a more general question. Cheers

Thanks a lot for that. PhD is in information systems, with an application in the scuba equipment domain. I'm interviewing domain experts in real life and checking up on bits that we didn't cover or that I wonder about afterwards here. So your info is really valuable to me and much appreciated.

Hi, I was just wondering: as opposed to a regulator without a spring adjustment knob, does a regulator that has one have a different design on the inside because there is a range of air flows (from min to max) which introduce variability in obtaining a laminar flow? Thanks in advance.

Thanks for clearing that up.

Thanks, cerich. I assumed it was a heat sink because I took apart a second stage and compared it to a Zeagle second stage service manual, which had an almost identical part labelled 'heat sink' there. This is all part of my PhD project, will PM you when I have a more solid prototype ready, if...

Thanks. I did mean the second stage heat sink. Wouldn't a threaded heat sink have more surface area than one with a sleek inside?

With 'cracking', do you mean an adjustment knob that has a ratchet?

Thanks for your answer. Doesn't the dive/predive venturi control lever serve that purpose?

Hi Why is the heat sink on the HOG 2nd stage ribbed? Aesthetic/symmetric purposes? Also why are there never any threads in heat sinks? Thanks in advance.

Hi, Since Mares has no spring adjustment knobs on its 2nd stage regulatorss, I reckon there are disadvantages to this part of the regulator. What are they? Thanks in advance.

What are the uses of the spring adjustment knob? I've only found two: 1) with heavy exertion you want less effort breathing 2) in strong currents you want a bit more Are there any other uses of the spring adjustment knob?

I don't really understand how the heat sink works, really, and it seems such a simple part.

Sas, threads are vertical.

Hi all, here's a video from our adventures last weekend near Perth, Western Australia. Shark Cave and The Slot Dives on Vimeo Don't know if this is the right forum but enjoy anyway. Cheers

Do what the tables tell you to do.

O_o I just did that and I think I'm starting to understand what you mean.