Hamsub Mk.I is online.

There's good news and bad news.

Good news: The sub is neutrally buoyant, and stays upright in water. The design seems solid, moreso than I expected on the first try.

Bad news: The RC minisub that provides maneuverability is kind of crap. It has no ballast tank and relies on downward angled props to descend. This barely works. I can descend, but not without going forward a bit, and the minute the props stop spinning, the sub slowly ascends (which I can accelerate by reversing the prop spin direction, but the sub also moves backward, etc)

Solution: I've ordered a replacement mini RC sub that is much more expensive but which has a proper ballast tank, so it can greatly alter its own buoyancy on command. It also has stronger thrust, as you can see in the video that's something Hamsub sorely needs. The current thrusters struggle to make the sub turn against the influence of the air hose, which is as thin and flexible as it comes.

Here's a vid of the new RC sub that will soon be providing maneuvering capability for Hamsub Mk.II: http://www.youtube.com/watch?v=cWbuaKVH-JU#t=0m36

I expect the final product will also make an excellent low cost ROV simply by sticking a video camera inside the passenger capsule. For once, one of my projects has practical applications. Feels wrong somehow.

Mission 1 complete.

Here's the video:

Everything went about as well as I could expect. Leaving them unattended overnight was nerve wracking but upon opening the habitat I found them sleeping piled on top of one another like nothing was amiss. They're now chilling in their tank awaiting new adventures. :3

Some things I want to fix for next time: The room 2 camera is pitifully low resolution, I apologize for this. I thought it would look better when I ordered it. I've already bought a higher resolution (640*480) replacement that is nearly as compact. I can't use a regular digicam because it takes up too much space, the hamsters need elbow room. But I think the new camera will be ideal, and if so I plan to buy more so in the next video we can get footage from every room rather than just two.

The battery pack read 20% when I found it, so longer missions are probably possible, but I think 24 hours is about as long as I'd consider deploying the habitat in this configuration. Eventually I'd like to upgrade the habitat and install it in a pond out back which I need to clean up a lot first. When that happens I can connect it to grid power and leave it down for a week at a time, with a livestream you guys can watch.

All in all, a fairly successful mission. And it began on the same day as the latest Aquarius mission, Neemo 15. Incidentally, by the official definition of aquanaut (one who lives in an underwater habitat for 24 hours) my hamsters are now genuine aquanauts.

T-minus 1 hour to mission end.

At 1pm today I'll be removing the habitat from the water, marking the end of the 24 hour underwater mission. Early this morning I dropped by the site, plugged my laptop into the webcam USB umbilical and was able to confirm that the hamsters are not only alive but appear active and healthy. Even so I was worried pretty much the entire time. No matter how much effort you put into the design, the safety system and whatnot, when there are lives in the balance you still feel irrationally paranoid until it's all over. I'm very tempted to remove them now lest something go wrong at the last minute but I want to see this through. Wait for the followup post, where I'll have cut together video from the onboard cameras for your review.

Today's the day.

In a bit, I'll be deploying Hampture Mk.III. Video will be available tonight and I'll be retrieving the habitat at the same time tomorrow. Wish me luck.

Big update

I got my live culture of algae in the mail sometime back and it's been growing in the main jug ever since. Why buy algae you ask? As it turns out if you just scoop up some pond water you're getting tons of different organisms which in fact compete with the algae and impact its ability to efficiently generate oxygen. With a pure supply and a sealed jug (air is bubbled in via aquarium pump) I can ensure that the only thing growing in there is what I intended for.Once the main jug is sufficiently dense with algae I can pour some into each of the smaller bottles. Keeping a large healthy backup population prevents me from having to start over with the cultivation process if something happens to the bioreactor system.

Next, I scouted the precise location from which Hampture Mk.III will be deployed. As you can see there's an island near the center of the lake, with a steep dropoff into the water that should permit me to get Hampture in quite deep water without needing an absurdly long umbilical.Below you can see the fallen log which acts as a bridge to the island. This makes it inaccessible enough that I can confidently hide the surface support gear in the brush to one side of the island and feel fairly certain that it won't be found.Finally, here's the view from the island itself.Hampture Mk.III will be perhaps fifteen feet from shore and 7 feet down. It will be in water 8 feet deep, but propped up off the pond bottom on cinderblocks which will also serve as weights to keep it from floating. It's surprisingly difficult to keep any significant quantity of air trapped underwater, but I've factored that into the design. Once I have those weights attached, as well as a water filter for the drinking intake, it will be time to deploy.

Hamsub begins development.

One of the most requested additions to Hampture has been a submarine of some sort as transportation for the intrepid hamsternauts. Toward that end, while I wait for an opportunity to install Hampture Mk.III in a nearby pond, I've begun work on a small single occupant submersible:

I intend to buy either an RC sub or ROV kit and use the components to turn this life support pod into a fully fledged submersible, with three waterproof motors and a small camera so I can properly steer it. The thin, flexible air hose will be woven into the same tether that supplies power and control such that the passenger has a steady supply of fresh air at all times. Here's the cockpit pod dealie in a tank of water. While air is being supplied I had a hard time getting bubbles to show up in the pictures.

If it's hard to tell, air is pumped in through the back and vented out through a small hole in the floor near the front window. This ensures that if there is a breach, any water that gets in will be continually forced out by the air pressure. A 15 minute test submersion with tissue inside came back dry, so I put Ratlas in there for about 10 minutes to see how he handled the snug quarters. He shredded the tissue, made a nest and fell asleep. :3

I'd love to figure out some way for a sub to dock at Hampture for food resupplying and transferring hamsters to/from the colony but the mechanism involved seems hopelessly complex and unsafe, so unless I discover that there's some professional quality premade connector that will do the job, Hamsub will be deployed from the surface only.

Bonus mspaint time:

Hampture Mk.III is complete and read to deploy.

It's even inhabited. Meet Hamdrew Ryan, Ratlas and Nomtaine.

As you can see, our three hamsternaut heroes are getting used to their new habitat and figuring out where the various rooms are and what they contain. I've got a redundant battery backup pump system running and after about 90 minutes of chilling out and watching them they seem fine, which is consonant with the original calculations indicating that the deep water air pump moves enough air to sustain 15 hamsters. 3 seems to be no sweat. I modified the tubing so that air is now supplied to every single room rather than just two (relying on airflow to carry fresh air to the other two) as I figure it's safer. Even so, it makes me nervous knowing that soon they'll be living deep underwater for days on end.

The resistive heating pad is installed and powered on, they seem to be intrigued by it but they don't hang around on it for very long. I figure if I'm going to have it in the water overnight they'll need the heat source, and they'll figure out what it's good for then. I also installed the water nozzle, which works as expected, and I'll be installing the water filter on it sometime tomorrow. After that I've just got to clear out the pond area and figure out where I'm going to sink it.

Things are really moving quickly now! :3