The problem, though, is that until recently, gyroscopic stabilizers were monstrous machines, weighing about 100 tons. Their power is dependent on how fast the wheel spins, or heavy the wheel is, or how large the diameter is. So the units were bulky and required a lot of power, limiting their use to larger boats. In the 1970s, fin stabilizers were invented as an alternative for smaller vessels—imagine a canoe rapidly moving oars in and out of the water to keep the hull from tipping. But fins, while effective, require a lot of power, and naturally create a good deal of drag. So in the early 2000s, Seakeeper decided to try to create what then seemed impossible: a gyroscopic stabilizer for small vessels.