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Old 2015-03-16, 16:38   #1
Flatlander
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"Chris"
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Default Bloodhound Supersonic Car

Is the maths here wrong or am I going mad (it could be both of course):

Bloodhound: Superwheels for supersonic car go into production

Last fiddled with by Batalov on 2015-03-16 at 16:42 Reason: (link)
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Old 2015-03-16, 16:41   #2
kladner
 
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Quote:
Originally Posted by Flatlander View Post
Is the maths here wrong or am I going mad (it could be both of course):

Bloodhound: Superwheels for supersonic car go into production
Corrected link:
http://www.bbc.co.uk/news/science-environment-31845234
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Old 2015-03-16, 23:39   #3
ewmayer
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Fascinating stuff about the high-tech disc wheels - thx for the link(s).
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Old 2015-03-17, 07:42   #4
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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.
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Old 2015-03-17, 18:12   #5
Flatlander
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I was out by a factor of ten for some reason.
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