>...nine times faster than a fired bullet... I don't think so. A NASA publication [1] gives the SOFI piece impact velocity as about 800 feet/sec. Rifle bullets

>...nine times faster than a fired bullet... I don't think so. A NASA publication [1] gives the SOFI piece impact velocity as about 800 feet/sec. Rifle bullets reach 2.5K - 3K fps muzzle velocity routinely. [1] https://history.nasa.gov/columbia/Troxell/Columbia%20Web%20Site/CAIB/CAIB%20Website/news/FOAMIM~1.PDF https://history.nasa.gov/columbia/Troxell/Columbia%20Web%20S...