Diamond Aircraft DV 20 E - Page 20

General DV 20 E AFM
Page 1 - 8 Rev. 2 22-Mar-2022 Doc. No. 4.01.25-E
v
S1
: Stalling Speed, or the minimum continuous speed at which the airplane is still
controllable with flaps retracted.
v
x
: Best Angle-of-Climb Speed.
v
y
: Best Rate-of-Climb Speed.
v
50ft
: Speed at 50 ft above take-off surface.
(b) Meteorological Terms
ISA: International Standard Atmosphere. Conditions at which air is identified
as an ideal dry gas. The temperature at mean sea level is 15 °C (59 °F),
air pressure at MSL is 1013.25 hPa (29.92 inHg); the temperature
gradient up to the altitude at which the temperature reaches -56.5 °C
(-69.7 °F) is -0.0065 °C/m (-0.00357 °F/ft), and above this 0 °C/m (0 °F/ft).
MSL: Mean Sea Level.
OAT: Outside Air Temperature.
QNH: Theoretical atmospheric pressure at MSL, calculated from the elevation
of the measuring point above MSL and the actual atmospheric pressure
at the measuring point.
Density Altitude:
Altitude in ISA conditions at which the air density is equal to the current
air density.
Indicated Pressure Altitude:
Altitude reading with altimeter set to 1013.25 hPa (29.92 inHg).