Brent,
Good call! I did not test that with this timer. I did make that test some months ago on the Fiorotti timer, and it does account for being inverted. In other words when inverted, and the outboard wing rolls up, the RPMs increase. With that being said, when I get a chance I will perform that test on the Climb and Dive timer and post my findings. I would bet that it works the same way as the Fiorotti. If not then it would be a no go for flying the pattern.
Frank