Question

How does temperature lapse rate affect aircraft design

Answer 1

The temperature lapse rate will affect the performance of the aircraft. That is the colder the temperature, the poorer the aircraft performs.

Answer 2

The aircraft's performance will be impacted by the temperature lapse rate. That is, the aircraft performs worse in cooler temperatures.

Lapse Rate: What is it?

• The rate at which temperature varies with height in the atmosphere is known as the lapse rate.
• If the lapse rate is positive, the temperature declines with height as it often does; conversely, if the lapse rate is negative, the temperature increases with height (an inversion).
• The pressure drops with height when air is pushed to ascend in the atmosphere.
• The temperature of an air parcel will decrease as it expands at this lower pressure because there are fewer molecular collisions in the bigger volume.
• As a result, the temperature increases as the air pressure decreases.

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