Effects On Lower Air Density; Effects Of Lower Air Density On Engines; Density Altitude - Silva ADC Pro User Manual

14.5.1 Altimeter Mode -
Effects of lower air density on people
!
If you go high enough by climbing a
mountain, about 3658 meters high, the air's
pressure is about 40% lower than at sea
level.
!
This means that with each breath you are
getting about 40% less oxygen than at sea
level.

Effects of lower air density on engines

!
When the air's density decreases, the lifting
force on an aircraft's wings or helicopter's
rotor decreases, the power produced by the
engine decreases, and the thrust of a
propeller, rotor or jet engine decreases.
!
When the air's density is low, airplanes need
longer runways to take off and land and they
don't climb as quickly as when the air's
density is high.
!
Air density also affects the performance of
automobiles; with lower density decreasing
performance in the same way it decreases
the performance of aircraft engines.

Effects on Lower Air Density

Density Altitude

!
As air's density varies by altitude (the
c o m b i n a t i o n e f f e c t o f p r e s s u r e a n d
temperature), hence the performance of
aircrafts or
affected in different altitude (air density).
!
Pilots need to take the above facts into
account because the lift, power and thrust
would be different between the standard
atmosphere and the real atmosphere (the
Density altitude).
automobile engines will be