|Jul 28, 2014, 02:55 PM|
I'm using a Audio Tach app for RC and reg. 2 stroke and 4 stroke engines up to 12 cylinders. You can set the min low rpm and max with a resolution of 80 rpm +/- .
I video tape with a head mounted cam and then review the footage while watching the audio tach readings. I have checked it up against two of my photo cell type tachs and its right on the readings. Called RPM Gauge.
Yes last runs done with the 4p apc prop will try a thinner cord 3.5 x 4 next. 3dia. just doesn't have enough thrust for my taste. Sorta like flying a ducted fan jet leaving you to always manage the airspeed avoiding excessive elevator.
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