Other features were the use of flotation chambers and a float attached to the underside of the fuselage for extra buoyancy.
The general architecture is identical, consisting of two flotation chambers, for the Amas, joined by a load carrying platform, which carries the superstructure.
In the case of Irvine, the bar and the flotation chamber are some distance apart.
It was a parasol cantilever flying boat with a V-Section hull, and downswept wingtips incorporating flotation chambers.
It motored off towards the middle of the river, its flotation chambers vented now, sinking it to the bottom.
Another way to replace gimbals is to use fluid bearings or a flotation chamber.
Therefore, some systems use fluid bearings or a flotation chamber to mount a gyrostabilized platform.
After some 140 million years of development, the nautiluses gave rise to a variant group with many more flotation chambers to each shell, the ammonites.
There's more that you can't see, like the flotation chambers for reserve buoyancy.