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the claim

Solid rocket motors have lower specific impulse than liquid rocket engines.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
6 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that solid rocket motors have lower specific impulse than liquid rocket engines?

Yes. Two peer-reviewed papers state directly that solid rocket motors have lower specific impulse than liquid rocket engines, and a reference article and a Q&A give supporting Isp figures and rankings.

Verdict: SUPPORTED · 6 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 6
Solid-propellant rocket
Get citation
Solid-propellant rocket. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Solid-propellant_rocket

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More for · 5
Comparative Analysis of Liquid Rocket Engines and Solid Rocket Engines based on Specific-Impulse
2023
Get citation
Mekuriya, N. A. (2023). Comparative Analysis of Liquid Rocket Engines and Solid Rocket Engines based on Specific-Impulse. zenodo.org. https://doi.org/10.5281/zenodo.8139184

Can liquid rocket engines have the same thrust as solid rocket engines?
2020
Get citation
Can liquid rocket engines have the same thrust as solid rocket engines?. (2020). space.stackexchange.com. https://space.stackexchange.com/questions/49191/can-liquid-rocket-engines-have-the-same-thrust-as-solid-rocket-engines

Specific impulse gain mechanism of swirling helium-injected solid–gas hybrid rocket motor
2025
Get citation
Specific impulse gain mechanism of swirling helium-injected solid–gas hybrid rocket motor. (2025). doi.org. https://doi.org/10.1063/5.0257788

Numerical investigation on thrust gain mechanism of helium injected solid–gas hybrid rocket motor
2024
Get citation
Numerical investigation on thrust gain mechanism of helium injected solid–gas hybrid rocket motor. (2024). doi.org. https://doi.org/10.1063/5.0230517

Injector head for a LOX-HTPB hybrid motor
2022
Get citation
John, T. T. & S., S. (2022). Injector head for a LOX-HTPB hybrid motor. inis.iaea.org. https://inis.iaea.org/records/h0chk-7kv61

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