Human body can handle quite high G forces. How much depends upon how and where it is sustained. Anything under 12.5g over a reasonable impact area should not cause injuries. When it is through the spine like an ejection seat up to 30g is possible, it compresses the back by about 0.5", but if the spine is not straight then back injuries will occur.
In NASCAR racing drivers have walked away from 100g accidents.
F16 pilots are used to up to +9g/-3g, during combat but blood migration causing blackout / red out are a problem if they are sustained or outside of these limits. G-suits are used to restrict the flow and migration of blood.
F1 drivers sustain up to 5.5g with 1.6g for acceleration, 4g when braking and the 5.5g in high speed long sweeping corners. F1 drivers work on building the muscles in their neck David Coulthard's is classic F1 size.
If you are an acceleration junkie, which most big bike riders are, then I would think driving a drag car like this must be very exhilarating.
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Topic: Acceleration! (Read 1808 times)