Oppie wrote:

How about a rate gyro? The following should give you some insight.

http://www.analog.com/en/prod/0,2877,ADIS16100,00.html

http://www.xbow.com/Support/Support_...sorAppNote.pdf

http://www.murata.com/catalog/s42e.pdf

I was going to suggest a roll sensor turned sideways. ;-)

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Paul Hovnanian
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2 + 2 = 5 for extremely large values of 2.