Characteristic velocity

Characteristic velocity or $c^{*}$ , or C-star is a measure of the combustion performance of a rocket engine independent of nozzle performance, and is used to compare different propellants and propulsion systems.

Formula

$c^{*}={\frac {p_{1}A_{t}}{\dot {m}}}$

$c^{*}$ is the characteristic velocity (e.g. m/s, ft/s)
$p_{1}$ is the chamber pressure (e.g. Pa, psi)
$A_{t}$ is the area of the throat (e.g. m², in²)
${\dot {m}}$ is the mass flow rate of the engine (e.g. kg/s, slug/s)

gollark: Yes, probably, but that's not... what most programs actually do?

gollark: JSON and CBOR and whatnot are good formats for structured data, and you can parse those easily into structured data in your language of choice with about a gazillion tools (there's even `jq` for shell scripting!), and exchange them nicely over HTTP/TCP/whatever networking thing.

gollark: Which tends to be made up ad-hoc and be some terrible hard to parse thing.

gollark: If you want to translate structured data, which is what programs mostly operate on, into plaintext, you need some other format on top of that.

gollark: No, it's not, it's an... encoding, I guess.

References

Rocket Propulsion Elements, 7th Edition by George P. Sutton, Oscar Biblarz

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