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Old Jul 28, 2014, 03:55 PM
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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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Old Aug 26, 2014, 04:50 AM
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http://www.coxengineforum.com/t7067-cox-prop-question

Good news for .020 engines see this thread I asked Bernie to carry this rare prop as it really does well Cox 4D x 2.5P
Will be going into production in less than a week now. I would imagine Bernie will be selling them by mid month. Get them while they're hot they won't last he is only doing a run of 1k.
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