This unit combines the MS5611
precision absolute pressure sensor from our Accurate Vario sensor with a differential pressure sensor
that provides IAS (Indicated AirSpeed) from a standard forward pointing Pitot tube (no weird bent tubes). Together, these sensors enable the microcontroller to compensate the VARIO measurement for any changes in speed. The result is a reduced "stick induced vario", because any elevator input will trade altitude for speed or vice versa - without changing the total energy
of the model. Only outside forces (thermals) actually add energy (altitude gain without speed reduction). Using advanced Kalman filters and smoothing the Total Energy Compensated Vario reading provides a more reliable VARIO measurement, as long as the aircraft is within it's efficient envelope (no stall or excessive drag).
The IAS measurement is not reliable below 25kmh (15mph), so aircraft below this speed will not have the benefit of E-TEC.
The Electronic Total Energy Compensated VARIO
provices the following 3-in-1 telemetry types, all active at the same time using SBUS2:
Altitude and non-compensated vario. Resolution 1cm.
Speed sensor F1677:
IAS indicated Airspeed, 25 to 280kmh(175mph)
Altitude and E-TEC VARIO. Resolution 1cm.
This novel implementation enables the pilot to select which VARIO to use at any instance, and to compare the standard VARIO with the E-TEC.