A report on Fin and Grid fin

The Vympel NPO R-77 is a beyond-visual-range missile that uses grid fins. The gray KAB-500 OD guided bomb to its left has conventional "planar" tail fins.
Fins are used by aquatic animals, such as this orca, to generate thrust and control the subsequent motion
Closeup of MOAB grid fins
Caudal fin of a great white shark
Initial design aluminum grid fins on the Falcon 9 launch vehicle, undeployed. February 2015.
Aquatic animals typically use fins for locomotion
(1) pectoral fins (paired), (2) pelvic fins (paired), (3) dorsal fin, (4) adipose fin, (5) anal fin, (6) caudal (tail) fin
Grid fins (here folded against the payload fairing) are part of the launch escape system of Soyuz spacecraft.
Comparison between A) the swimming fin of a lobe-finned fish and B) the walking leg of a tetrapod. Bones considered to correspond with each other have the same color.
Grid fins stowed against the base of an SS-20 ballistic missile
In a parallel but independent evolution, the ancient reptile Ichthyosaurus communis developed fins (or flippers) very similar to fish (or dolphins)
Grid fins on a SpaceX Falcon 9 rocket. They guide the rocket's first stage during landing.
In the 1990s the CIA built a robotic catfish called Charlie to test the feasibility of unmanned underwater vehicles
First test of grid fins by SpaceX during a Falcon 9 controlled-descent test on 11 February 2015.

Grid fins (or lattice fins) are a type of flight control surface used on rockets and bombs, sometimes in place of more conventional control surfaces, such as planar fins.

- Grid fin

These are typically planar and shaped like small wings, although grid fins are sometimes used.

- Fin

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