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Drogues are usually deployed by fast moving boats while running downwind in major storms. They are dragged behind a boat to slow it down so that the storm can pass overhead. Sailing downwind with a drogue (also called a sea anchor) is usually preferable to trying to sail upwind against wave and wind to get out from under a squall or with bare poles which leave a boat with little or no control at all.
The reason, I suppose, that you can't find a small one, is that small boats like this are not usually in such a situation, esp. not offshore where you have no choice but to deal with the storm.
If your boat is capsized or turtled, I doubt very much that a drogue would even "inflate", let alone keep your boat from sailing away from you. In this regard, the term "sea anchor" is really a misnomer.
As I said before, a regular anchor might do the trick if you had enough scope on it (at least 5-7 times water depth) and were lucky enough for it to set itself.
I'll bet you find, though, that the boat isn't going as far as you think when its over, so scrambling to get the bow into the wind will probably be all that you need to do.
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