[PSUBS-MAILIST] Shackleton update

[hank pronk via Personal_Submersibles]

Alec,You don't have to go away from what you have, in fact, I would keep it all in place and add to the top of the existing tanks outward to widen the top 12 inches or so on each side.  You don't have to change mounting of tanks and wrecking you new paint.   Having said that, I do realize that sometimes it is easier to start over.  Hank   

    On Tuesday, August 9, 2016 8:26 PM, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Hi everyone,
Here's an update for those who were at the convention discussion of Shackleton's stability. We did a second test yesterday, adding ballast per the calculations to bring the center of gravity below the center of buoyancy when surfaced. After that we also tried Hank's suggestion of drilling holes in the lower part of the MBTs to gain some stability that way too, and that also helped. Both things worked as expected and the sub now has some stability. However, I also wanted to see how it actually felt in the water walking around on the deck, and I wasn't happy with that. I'm evaluating modifications, and my current thought is to replace the MBTs with a "raft" configuration, raising the tanks' CB and considerably increasing the beam. That would have the benefit of massively increasing stability while keeping the high coning tower and its associated freeboard, a key design objective. I'm researching mineral tanks and similar off-the-shelf options.

Best,
Alec
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