On Thu, 1 Sep 2005, Gordon LaPoint wrote:

> On Wed, 2005-08-31 at 18:26, David Van Horn wrote:
>
>> Well, if you manage to exceed 1G on a flat road, let me know. :)
>>
> AAFD class drag race cars do .25 mile standing start in about 4.7
> seconds, reaching a peak speed of >300MPH, exceeding 4G for some of the
> race, on a flat road.

According to v = a*t 0.25 miles to 300MPH in 5 seconds corresponds to 27 
m/sec^2 (~3G). Horizontal acceleration above 1G is not possible without 
anti-g (or pro-g) devices or reactive propulsion imho.

More realistic figures are e.g. 0-100km/h in 9 seconds which from above 
yields 2.8 m/sec^2 (~0.3G). 0-100km/h in 4.5 seconds is close to the 
limit of adherence of the rubber tyres to the ground. It's still only 
~0.6G.

An aircraft that takes off at about 160mph (71 m/sec) and needs 1200 
meters to do that pulls ~0.2G's horizontal (a = v^2/(2*x)).

Peter
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