There are iPhone apps that claim to use the accelerometers and position awa=
reness of iOS devices to derive power as well as measure the 0-60, 1/4 mile=
 etc times of your car. "Dynolicious" is one example.
The problem is whether they scale down to bicycle + human levels well.

Cheers,=20
         Robin.

On 22 May 2011, at 16:24, "John Gardner" <goflo3@gmail.com> wrote:

> It's possible to measure power with accelerometers.
>=20
> VELOCITY=3DMPH x 5280/3600
>=20
> FORCE=3DMASS x (ACCEL+DECEL)     ;  ACCEL & DECEL in < g >
>=20
> HP=3DFORCE x VELOCITY/550
>=20
> DECEL subsumes grade, aero drag, & so on. In principle, a 3-axis
> accelerometer & sufficiently whiz-bang DSP could be carried loose
> in your pocket.
>=20
> Measuring torque at the hub is much simpler...
> --=20
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> http://mailman.mit.edu/mailman/listinfo/piclist

--=20
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