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Torsion of non-unit speed curve

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Poirot

Banned
Feb 15, 2012
250
calculate torsion of y=(sqrt(5)+3cost, 3+tsqrt(7), 1 - 3sint). The usual way I do this is use the frenet formulae for a USC. But y is not USC with speed = 4. So I argued that (1/4)y is USC, found the frenet frame and then torsion t satisfies
b'(s)= -tu(s). Found t=sqrt(7)/4 so that torsion of y is t=sqrt(7). Is this correct?