Hi Ken,
For six years I have been developing active CLTimer system up to the current v6 version using accelerometer to measure acceleration and inclination of the model by adjusting Motor RPM for best flight performance.
With excellent feedback from Fred Underwood I developed an algorithm making it a reliable and functional system where the pilot concentrates 100% on maneuvers.
Currently the CLtimer is capable of controlling two ESCs with differential adjustments for contra or bi-motor system and landing gear, having a blue LED visible even to the sun that indicates start and end of flight.
The system uses the JetiBox programming box for adjustments at a reasonable price.
More information at cltimer.com
Rogerio.