The unmanned Skylab station was launched into orbit by a Saturn V booster. The Saturn V rocket carried humans to the moon and remains the most powerful rocket to reach orbit to date. Credit: NASA
Physics-based acoustical models and historical data combine to correct common misconceptions about the most powerful rocket launched to date.
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Such ideas have been proven false. Researchers from Brigham Young University (BYU) used a physics-based model to estimate the acoustic levels of the Saturn V rocket. They obtained a value of 203 decibels, which matches the very limited data recorded in the 1960s. The study appears in The Journal of the Acoustical Society of America, published on behalf of the Acoustical Society of America by AIP Publishing.
The Skylab space station was launched on a modified Saturn V rocket. Credit: NASA
To put that number into perspective, commercial jet engines range from around 120 to 160 decibels.
“Decibels are logarithmic, so every 10 decibels is an order of magnitude increase,” said author Kent L. Gee, of BYU. “One hundred and seventy decibels would be equivalent to 10 aircraft engines. Two hundred would be 10,000 engines!”
In 1967, the Apollo 4 mission launched from NASA’s Kennedy Space Center. The mission marked the first launch of the Saturn V rocket. Credit: NASA
While the Saturn V was indeed extremely loud, that kind of power is nowhere near sufficient to melt concrete or start grass fires. If reports about these phenomena are true, they likely stem from radiative heating via the plume or debris.
Some of the misunderstanding originates from confusing sound power with sound pressure. The former is like the wattage from a light bulb. The latter is like the brightness from the same bulb: It depends on how far away you’re standing. Mistakes in calculations, changes to the decibel reference system, and the propagation of misinformation have also led to compounding errors.
“The Saturn V has taken on this sort of legendary, apocryphal status,” said Gee. “We felt that, as part of the JASA special issue on Education in Acoustics, it was an opportunity to correct misinformation about this vehicle.”
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