I'll grant you that a curved rear limb is useful for springing off the ground-and the dragonet's are powerful, with muscles into the back to provide assistance-but that long back is vulnerable.
The OR fylfot is depicted with curved outer limbs, more like a "sunwheel swastika" than a traditional (square) swastika or heraldic fylfot.
The basic elements of a bow are a pair of curved elastic limbs, traditionally made from wood, joined by a riser.
Then the blue world suddenly blossomed and filled the screens entirely, its curved limb a white line, the blue water all patterned by white cloud swirls, the continents peaking out from cloud patterns like little rebuses of half-remembered myth: Asia.
Yamagata could see streamers arching up from the Sun's curved limb into the blackness of space, huge bridges of million-degree plasma expanding and then pouring back down onto the blazing, searing surface of the photosphere.
A curved limb will suffice as a throwing stick.
A fold can be shaped as a chevron, with planar limbs meeting at an angular axis, as cuspate with curved limbs, as circular with a curved axis, or as elliptical with unequal wavelength.
In fact it looked a bit like a spider, except that its eight identically curved limbs were divided top and bottom: four running up to the 'body' from the floor, and four sticking grotesquely in the air.
The middle growth stage begins at the end of the last curved limb of the first growth stage.