Vent: my $900 digital protractor still needs the old analog gauge to verify

Spent the money on a fancy digital protractor for rigging checks last month, figured it would be the last word on angles. Ran it on a King Air trim tab in Tulsa and it read 2.3 degrees, but my old analog gauge said 2.1. Turns out the digital unit was picking up a slight slop in the bracket, not the actual tab angle. Had to verify with the analog gauge and a machinist square before I trusted either reading. Anyone else keep the old tools around even after upgrading to digital? I feel like they catch what the screens miss.

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1 Comment

noah2481mo ago

Digital tools are only as good as their last calibration, and that calibration comes from the old school stuff. You paid $900 for a screen that lies to you when a bracket flexes a hair, but the analog gauge has no battery, no software, no way to trick you. The real problem is people trust the digital readout too much, then they stop double checking the physical setup. That 0.2 degree difference might not matter on a trim tab, but it will bite you hard on something like a rotor head or a control rod end. Every digital tool I've ever owned has had a blind spot, and the cheap mechanical reference always finds it. You're not keeping the old gauge as a backup, you're keeping it as the actual truth teller.