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An aircraft is climbing with a 20° of climb angle and a 5° of angle of attack having a mass of 11,000 kg and aircraft drag is 9,000 N then determine aircraft lift.(a) 11453.17 N(b) 9220.07 N(c) 11553.17 N(d) 97385.85 NI have been asked this question in class test.This interesting question is from Cruising Performance in chapter Cruising Performance of Aircraft Performance

Answer»

The correct choice is (b) 9220.07 N

Easy explanation: Aircraft weight=mg=11000*9.81=107910 N.

Engine thrust: From equating the forces we get the FOLLOWING equation: T COS α= D+W sin γ

T=\(\frac{D+Wsin\gamma}{cos\alpha}\)=\(\frac{9000+107910*sin(20)}{cos(5)}\)

T=46082.75 N.

From equating the VERTICAL forces we get the following equation: L+Tsinα=Wcosγ

L=107910*cos(20)–46082.75*sin(5)

L=97385.85 N.



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