Thanks Craig. I still get the app locking up if I change the position of any of the fin plot points. And it seems to be the case with any of the defined fins not just that forward set. I suppose that it must be something in my environment because the drive definitely spins up as soon as I click on one of the plot points.

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Gravity is a harsh mistress
SAM 002
NAR 91005
"The complexity of living is eminently favored to the simplicity of not."