The rectangular wings of a microlight aircraft have a combined spanwise length of 9.144 m and streamwise (direction of air flow) width of 0.9144 m The wings have a coefficient of form drag of 0.01 and a lift coefficient of 0.3 in cruise. When cruising at a speed of 150km/h and altitude of 3,000 feet, the temperature and absolute pressure of the atmospheric air are 5°C and 90 kPa, respectively.

Elements Of Electromagnetics
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The rectangular wings of a microlight aircraft have a combined spanwise length of
9.144 m and streamwise (direction of air flow) width of 0.9144 m The wings have a
coefficient of form drag of 0.01 and a lift coefficient of 0.3 in cruise.
When cruising at a speed of 150km/h and altitude of 3,000 feet, the temperature and
absolute pressure of the atmospheric air are 5°C and 90 kPa, respectively.
a) Calculate the density of the air at cruising altitude.
b) Calculate the form drag on the wings.
c) Calculate the Reynolds number of the wings.
d) Calculate the skin friction drag on the wings.
e) If the fuselage of the microlight is spherical with a diameter of 1m and the total
drag of the aircraft is represented by the contribution of fuselage and wings
combined, and assuming the skin friction drag is negligible for the fuselage only,
calculate the combined total drag force.
f) Calculate the power required to overcome total drag in cruise, using the value
calculated in part e).
g) Calculate the maximum weight limit for the aircraft to be able to fly at this altitude.
Transcribed Image Text:The rectangular wings of a microlight aircraft have a combined spanwise length of 9.144 m and streamwise (direction of air flow) width of 0.9144 m The wings have a coefficient of form drag of 0.01 and a lift coefficient of 0.3 in cruise. When cruising at a speed of 150km/h and altitude of 3,000 feet, the temperature and absolute pressure of the atmospheric air are 5°C and 90 kPa, respectively. a) Calculate the density of the air at cruising altitude. b) Calculate the form drag on the wings. c) Calculate the Reynolds number of the wings. d) Calculate the skin friction drag on the wings. e) If the fuselage of the microlight is spherical with a diameter of 1m and the total drag of the aircraft is represented by the contribution of fuselage and wings combined, and assuming the skin friction drag is negligible for the fuselage only, calculate the combined total drag force. f) Calculate the power required to overcome total drag in cruise, using the value calculated in part e). g) Calculate the maximum weight limit for the aircraft to be able to fly at this altitude.
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