BPACH:
Its time to get some new equipment for my wife and I. I was wondering how difficult it is to learn to dive with a dry suit. Would you recommend a drysuit for a new diver? Does the air in the suit try to float you in a vertical position? What are the drawbacks of a drysuit? And what is a semi-dry suit? All opinions are welcome.
Thanks
...to be handled when you dive. Regardless of how tight you wear the suit, it traps a bubble of air in it, and maintains that bubble at the highest portion of the suit (in relation to the surface) no matter what orientation the diver is in. This air bubble expands and contracts as pressure is applied to the outside of the suit, so as you get nearer the surface, the air bubble expands and increases your bouyancy. As Mrs Mares noted, if your feet are closest to the surface, they tend to collect the bubble and get loose and big.
All that having been said, once you experience it a few times, it becomes kind of 'second nature' to vent the suit as you ascend, and add air to the suit as you dive deeper. I recommend a Drysuit training class at a local dive shop to help you learn the skills to allow you to dive in a drysuit, then go out to the water and make a few mistakes in shallow water and learn how to dive dry. Once you get the hang of it, you'll never step foot in cold water in a wet suit again.
Oh, a semi-dry, is a WET Suit with a bit of engineering that minimises the amout of water exchange to keep you a bit warmer. You are still diving WET in a semi-dry suit.
I have been diving dry for the last two years (60+ dives) in the last year and a half and will only dive wet in the tropics. I LOVE to dive, but hate to get cold and the drysuit takes care of that. While you are looking anyway, I really LOVE my dryhood and drygloves. My Viking Xtreme drysuit came with an attached dryhood and my head and hair stays warm and dry in even the coldest water. After a year of diving with heavy wetsuit gloves, I have gone to the Viking dryglove system and will NEVER go back to wet gloves. Diving the wrecks in the cold water would make my hands ache, but NO MORE. Now I put on a pair of wool glove liners, and then some drygloves attached to the sleeves of the drysuit and have nice warm fingers.
Drop a line if you have specific questions and I'll try my best to answer them....
Good luck!