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Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects Figure 63: Landing Gear Placement 8.4.6 Longitudinal and Lateral Ground Stability: Longitudinal stability is determined by the angle from the main gear to the aircraft center of gravity as seen in Figure 64. Figure 64: Longitudinal Stability In order for stability to be assured, this angle must not be less than 15°, or else the plane will tend to nose into the ground, prompting a propeller strike on landing or even during taxi. The aircraft may also tip backwards under the same conditions, rendering ground control impossible. With the current landing gear placement, the angle for the Buff-2 Bomber is 20°, giving the vehicle ample stability in the longitudinal direction. Lateral stability depends on the angle ψ which is seen in Figure 65. In order to be statically stable (i.e. when not in motion) the angle ψ must be under 90°. Because the Buff-2 Bomber has a lateral stability angle of 85° under the worst loading case (two rockets on one wing), the aircraft achieves lateral stability in all circumstances (lateral stability was calculated using AAA [27] ). 90
Project Final Report – CUDBF April 30 th , 2009 ASEN 4028: Aerospace Senior Projects Figure 65: Lateral Stability Angle Definition Once the ground stability was guaranteed, the total load applied on each gear strut was determined using the following equations. The determined gear loading values are provided in Table 18, including the final weight percentage that each strut carries during the worst loading scenario. = + Equation 27 - Nose Gear Load = ( + ) Equation 28 - Main Gear Load % = 100 Equation 29 - Weight Distribution Percent on the Nose Gear % = 100 Equation 30 - Weight Distribution Percent on the Main Gear 91
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University of Colorado Design/Build
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PFR - Aerospace Engineering Sciences Senior Design Projects ...

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