http://www.newscientist.com/article/...html?full=true
"...the wheels of a 1000 mph car will need to rotate at over 10,000 revolutions per minute, many times faster than on an ordinary car. This rate of spin entails an acceleration of almost 50,000
g at the rim, generating forces that would easily tear conventional wheels apart. Instead, this car will need wheels of solid titanium, or more likely carbon-reinforced aluminium. What's more,
as the vehicle approaches the speed of sound, it produces a frontal shock wave which liquefies the earth ahead, so the wheels end up carving through ground, rather than simply rolling over it."
"Huge, rapid and hard to control thrust is no bother to
Rosco McGlashan, an Australian drag racer who has set up a rival team to Bloodhound and North American Eagle. His car, Aussie Invader, will also be propelled by rockets - in fact, nothing but rockets."