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VBCurtis · 2015-03-17, 07:42

Which maths are you doubting?

radial (centripetal) acceleration = r * (angular velocity)^2.

170 rev/sec * 2pi = 1068 radians/sec. r = 45cm, so a = 510000, or 50000g after some rounding to be conservative.

10500 RPM was also claimed; divide by 60 to get the same 170 rev/sec (again, rounded for journalistic use).

A number not cited in the article: 1068 rad/sec *r = 480 m/sec linear velocity of car. But a m/sec is 2.23 MPH, so 1070 MPH. That's only a little higher than the target speed record, which is averaged over a mile or more.

2015-03-17, 07:42	#4
VBCurtis "Curtis" Feb 2005 Riverside, CA 2·5·463 Posts	Which maths are you doubting? radial (centripetal) acceleration = r * (angular velocity)^2. 170 rev/sec * 2pi = 1068 radians/sec. r = 45cm, so a = 510000, or 50000g after some rounding to be conservative. 10500 RPM was also claimed; divide by 60 to get the same 170 rev/sec (again, rounded for journalistic use). A number not cited in the article: 1068 rad/sec *r = 480 m/sec linear velocity of car. But a m/sec is 2.23 MPH, so 1070 MPH. That's only a little higher than the target speed record, which is averaged over a mile or more.