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Mike, I have the book and I made a light. I used 4" PVC for the can, and Cyclon XCells to get 12V @ 10AH. I made a MR16 lighthead with various halogen bulbs. My total material cost was about $80 (I got a deal on the Cyclons). Yes, it works quite well. It really helps if you have a lathe at...

I love questions like this. I don't use "calculations" because they can be inaccurate. You can physically determine how much weight you'll be wearing. How much weight (lead) do you need to just get negative with only your suit on? In shallow water, inflate your rig and float it on the...

...but the correct phrasing is "klatu barada nikto". You can actually see a video clip of Gort at this site: gort

I've done both. Currently, I use the color-correcting (red) SeaVision prescription lenses in my Aqualung mask. The lenses are great for shallow, clear, sunny conditions, but I think they cut out too much available light in darker conditions. And they're wierd on night dives. I keep my...

Uncle Pug, the light head I'm currently using is an MR16, which is nice and compact, but not focusable. With a narrow (10 degree) spot, it is definitely capable of signalling. However, the larger the reflector, the more "usable" light you have. The 3" diameter focusable test-tube light heads...

We don't have to worry about ice, everything above 8000ft is frozen solid. We'll head up sometime next month. Here's my rig: shell-type drysuit, with heavyweight long underwear under the undergarment, and heat packs by my ankles. Backplate/harness (divers with rec bc's have to wear a web...

If you're going to use 4" tube (I assume PVC, wanna try ABS?), Yuasa and others make a 6v, 5ah battery that will fit. Put two of them together for a 12v package and the can will be about 10" tall. I haven't tried it yet, but I've sure thought about it. Should give you a long burn time with...

...we should've bought that compressor, Roak. Joe

Im surprised nobody said this yet, but the use of Depends has been around in the tech community for quite some time. Especially with women (they can't use a p-valve). Some guys are uncomfortable with the catheter (condom) if worn for a long time, so they stick with the diapers. BTW, buff...

Apparently you UK divers can just jump right in the water in February. Here in Colorado, we have to WORK to get wet (er, in our drysuits). Here are some pictures: Dale's ice diving pics In the top picture, that's me on the right; I'm wearing my drysuit undergarment to stay warm on the...

Your frame might be cracked. Take a real close look with a strong light and a magnifying glass. Joe

To get back to what divernva asked, I use my drysuit inflater hose. It's easy to undo, and just as easy to reattach. My BC hose is rubber-banded to the corrugated hose, which makes it more difficult to work with. If I was diving wet, I'd have no choice but to use the BC hose. Unlike...

I was roakey's buddy in the Advanced Nitrox/Deco Procedures class this last Saturday. Our instructor was very impressed with the Halycon closed-circuit bags we used, because they "save a step or two". We used spools, and I'm glad, because every other time I use a reel (Dive Rite) it snags, and...

...is worth the price. Knowledge is priceless. Buy the book even if you don't build your own light. You *will* learn something. If you buy an EE, AUL, Ralph Hood, whatever, you need to maintain it. Divelight Companion teaches that. Building your own dive stuff is lotsa fun; if I can't be...

I have, and I built a light pretty much from what I learned from the book. It's a 4" X 13" PVC can, with 1" thick top and bottom. I built a MR-16 head out of aluminum. The battery pack is 12 Cyclon X cells, wired to give 12V at 10ah. I'll build a test tube head next. The MR-16 head was a...