# \#fins

**URL:** https://scanalyst.fourmilab.ch/tag/fins/2456.md

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## [Why (Many) Rockets Have Fins](https://scanalyst.fourmilab.ch/t/why-many-rockets-have-fins/1744)

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**Author:** [@johnwalker](https://scanalyst.fourmilab.ch/u/johnwalker)\
**Replies:** 0\
**Last updated:** [25 July 2022 13:19 UTC](https://scanalyst.fourmilab.ch/t/why-many-rockets-have-fins/1744 "2022-07-25T13:19:26Z")

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It’s pretty easy to memorise “centre of mass ahead of centre of pressure”, but achieving it is more complicated, especially in liquid fuelled rockets whose propellant tanks drain during flight, shifting the…