Transcription of Chapter 8 Weight Estimation - Virginia Tech
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Chapter 8 Weight Estimation - Virginia Tech
72 Chapter 8 Weight IntroductionStatistical Weight equations, although capable of producing landing gear group weightsquickly and generally accurately, do not respond to all the variations in landing gear designparameters. In addition, the equations are largely dependent on the database of existingaircraft. For future large aircraft, such Weight data is virtually non-existent. Thus, it isdesirable that an analytical Weight Estimation method which is more sensitive thanstatistical methods to variations in the design of the landing gear should be adopted. Theobjectives are to allow for parametric studies involving key design considerations that drivelanding gear Weight , and to establish crucial Weight gradients to be used in the on the procedures described in this Chapter , algorithms were developed to sizeand estimate the Weight of the structural members of the landing gear.
DC10 B747 Weight fraction, %MTOW C5 MTOW, lb a) Pure weight fraction equations 2.00 2.50 3.00 3.50 4.00 4.50 5.00 105 106 107 Raymer FLOPS B737 DC9 B727 B707 L1011 DC10 B747 Weight fraction, %MTOW C5 MTOW, lb b) Weight fraction equations with landing gear length Figure 8.1 Landing gear weights comparison
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