Rocket and Fin

The Soyuz TMA-9 spacecraft launches from the Baikonur Cosmodrome, Site 1/5 in Kazakhstan
Depiction of rocket arrows, from the Huolongjing. The left arrow reads 'fire arrow' (huo jian), the middle is an 'dragon shaped arrow frame' (long xing jian jia), and the left is a 'complete fire arrow' (huo jian quan shi)
Fins are used by aquatic animals, such as this orca, to generate thrust and control the subsequent motion
An East India Company battalion was defeated during the Battle of Guntur, by the forces of Hyder Ali, who effectively utilized Mysorean rockets and rocket artillery.
Caudal fin of a great white shark
William Congreve at the bombardment of Copenhagen (1807) during the Napoleonic Wars.
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
Goddard with a liquid oxygen-gasoline rocket (1926)
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.
A V-2 rocket launched from Test Stand VII in summer 1943
In a parallel but independent evolution, the ancient reptile Ichthyosaurus communis developed fins (or flippers) very similar to fish (or dolphins)
Viking 5C rocket engine
In the 1990s the CIA built a robotic catfish called Charlie to test the feasibility of unmanned underwater vehicles
Gas Core light bulb
Illustration of the pendulum rocket fallacy. Whether the motor is mounted at the bottom (left) or top (right) of the vehicle, the thrust vector (T) points along an axis that is fixed to the vehicle (top), rather than pointing vertically (bottom) independent of vehicle attitude, which would lead the vehicle to rotate.
A Trident II missile launched from sea.
A Bumper sounding rocket
Apollo LES pad abort test with boilerplate crew module.
Doglegged flight path of a PSLV launch to polar inclinations avoiding landmass.
Workers and media witness the Sound Suppression Water System test at Launch Pad 39A.
A balloon with a tapering nozzle. In this case, the nozzle itself does not push the balloon but is pulled by it. A convergent/divergent nozzle would be better.
Rocket thrust is caused by pressures acting on both the combustion chamber and nozzle
Forces on a rocket in flight
A map of approximate Delta-v's around the Solar System between Earth and Mars
The Tsiolkovsky rocket equation gives a relationship between the mass ratio and the final velocity in multiples of the exhaust speed
Spacecraft staging involves dropping off unnecessary parts of the rocket to reduce mass.
Apollo 6 while dropping the interstage ring
during launch phase
torn apart T+73 seconds after hot gases escaped the SRBs, causing the breakup of the Shuttle stack
A battery of Soviet Katyusha rocket launchers fires at German forces during the Battle of Stalingrad, 6 October 1942

Stabilising fins are used as fletching on arrows and some darts, and at the rear of some bombs, missiles, rockets, and self-propelled torpedoes.

- Fin

They may also have one or more rocket engines, directional stabilization device(s) (such as fins, vernier engines or engine gimbals for thrust vectoring, gyroscopes) and a structure (typically monocoque) to hold these components together.

- Rocket
The Soyuz TMA-9 spacecraft launches from the Baikonur Cosmodrome, Site 1/5 in Kazakhstan

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