"maxlynn" wrote in message
news:9tXKb.103004$pY.50340@fed1read04...
What you say is true in a fixed one-g environment. You can derive a crude
measurement of angular rotation in any fixed, uni-directional acceleration
environment in the manner that you suggest. But as I understand the
proposed application, the accelerometer(s)/instruments are to be mounted
in
a dynamic environment. The accelerometers mentioned are designed to
measure
linear acceleration. That is what the manufacturer designed them to do.
They are NOT designed to measure rotation or rotational rates. That is
generally a domain reserved for gyroscopes and related insruments or
systems.

Well, read the datasheets. AD says specifically in their datasheets that the
ADXL's can be used as an inclinometer. Apart from that, a boat seems an
'almost fixed' one-g environmet to me.

Meindert