User manual

43
English
Perhaps best explained with these examples:
• Speed constant, altitude descending -> TEC variometer will
read SINK
• Speed constant, altitude climbs-> TEC variometer will read CLIMB
• Speed increase, altitude constant -> TEC variometer will read CLIMB
• Speed decrease, altitude constant -> TEC variometer will read SINK
The SDI C4 also provides an audible indication of the Total Energy
climb rate, with a broken beep-beep-beep indicating lift, and a
continuous beep indicating sink. You learn quickly to recognize and
respond to these sounds, speeding up when you hear sink and
slowing down when you hear lift. This behavior (called ‚dolphin flying‘)
makes a huge difference to the efficiency of your cross-country flying.
Please note that the McCready ring on the variometer in the TEC
variometer on our panel cannot be used. The information it can offer
is presented far more detailed and reliably by the C4 Competition.
Netto Variometer
The electronic ‚vario SC‘ variometer above and to
the left of the SDI C4 in the Aerosoft Discus has
been configured to continuously display the ‚Netto
climb rate‘, operating as a slave dial driven by the
SDI C4. It is a modified Total Energy variometer (see
above) with one additional compensation where the
intrinsic sink rate of the glider is also compensated.
Thus, this vario shows basically the ascent and descent of the external
air mass. As the intrinsic sink rate is obtained from performance data
of the glider, this works well only as long as the performance of the
real glider is not reduced, e.g. by flies or water drops on the wings - in
this case there is a setting within the main SDI C4 flight computer
where you can adjust its value for the glider performance of the glider,
to restore the accuracy of the Netto reading (see the SDI C4 manual
included in this package).