AIR_Manual_506a_ENG_rev_1.pdf
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McCready
Equivalent
McCready
4.2.6
INTEGRATED VARIO / NET VARIO AUTOMATIC SWITCH
You can change the vario’s indicators layout using VARIOMETER SETUP \ n. 12 DSEL :
0 = (default), the right-side analog bar shows the average vario and the digital indicator shows the
instant vario.
1 = right-side analog bar and digital indicator always show average vario values.
2 = right-side analog bar and digital indicator always show net vario values.
3 = right-side analog bar and digital indicator change depending on effective flight conditions: when you
are gliding, the right-side analog bar and the digital indicator both show net values and, when you are
thermalling, the right-side analog bar shows the average vario values and the digital indicator shows the
instant vario values.
4 = right-side analog bar and digital indicator change depending on effective flight conditions: when you are
gliding the right-side analog bar and the digital indicator both show net values, when you are thermalling, the
right-side analog bar and the digital indicator both show average vario values.
When the net vario value is shown, the “NET” icon will appear vertically on the right bar.
Thermalling mode / Gliding mode: it switches to “Thermalling” mode when it feels a new thermal for more than
x seconds (VARIOMETER SETUP \ n. 17 THET) default 2 seconds and you make a turn to fly into it;
it switches to “Gliding” mode when you fly “straight” for more than x seconds defined in VARIOMETER SETUP \
n. 16 CRUT); default =15 seconds.
4.2.7
McCREADY (WITH OPTIONAL PITOT TUBE)
The McCready value is the average lift value of the last “nn” minutes in thermal
To adjust the average lift time: ADVANCED SETUP \ n. 20 MCRA. (default: 10min)
N.B. In order to be able to use this function, you must have the Digifly AIR with Pitot
Tube and have the tube installed in your instrument; also you need to have the Polar
data programmed (for example, Polar 1: ADVANCED SETUP \ n. 11-12-13 P1A-P1B-
P1C) and that the Polar parameter itself is enabled to work with the values you have
programmed (for example, Polar 1: ADVANCED SETUP \ n. 10 POLA=1).
4.2.8
EQUIVALENT McCREADY (WITH OPTIONAL PITOT TUBE)
This value indicates the Equivalent McCready value: this is the McCready value, considering the current
airspeed as the optimal speed.
The equivalent McCready, based on the glider’s polar, the sink rate and the current airspeed (IAS), indicates in
real time at which true McCready value we are flying compared to the optimal speed. When this value matches
the one estimated in the thermal, this means that the current airspeed (IAS) matches the optimal speed (see
“Speed to Fly” section 4.3.1).
To set the reaction time of the Equivalent McCready indicator go to: ADVANCED SETUP \ n. 21 MCRE.
N.B. In order to be able to use this function, you must have the Digifly AIR with Pitot Tube and have the tube
installed in your instrument; also you need to have the Polar data programmed (for example, Polar 1:
ADVANCED SETUP \ n. 11-12-13 P1A-P1B-P1C) and that the Polar parameter itself is enabled to work with the
values you have programmed (for example, Polar 1: ADVANCED SETUP \ n. 10 POLA=1).
