Download PDF by L. L. M. Veldhuis, P. M. Heyma: Aerodynamic optimisation of wings in multi-engined tractor

By L. L. M. Veldhuis, P. M. Heyma

Plane layout three (2000) 129 - 149

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Example text

Determine the CG by adding the weight and moment of each weighing point to determine the total weight and total moment. Then divide the total moment by the total weight to determine the CG relative to the datum. The location of the CG may be expressed in terms of inches from a datum specified by the aircraft manufacturer, or as a percentage of the MAC. The location of the leading edge of the MAC, the leading edge mean aerodynamic cord (LEMAC), is a specified number of inches from the datum. Figure 3-4.

Indd 14 3/14/07 10:22:19 PM Weighing the Aircraft and Determining Chapter 3 the Empty Weight Center of Gravity Chapter 2 explained the theory of weight and balance and gave examples of the way the center of gravity could be found for a board loaded with several weights. In this chapter, the practical aspects of weighing an airplane and locating its center of gravity are discussed. Formulas are introduced that allow the CG location to be measured in inches from various datum locations and in percentage of the mean aerodynamic chord.

13 1. Determine the CG location in inches from the datum before the cargo is removed. Do this by first determining the distance of the CG aft of the LEMAC: Refer to Figure 7-3. For all flap settings and a CG located at 8% MAC, the stabilizer setting is 73/4 Units ANU. indd 4 3/13/07 11:03:14 AM 2. Then, determine new CG in % MAC: 3. 1% MAC. Effects of Onloading Cargo The previous example showed the way the weight and CG changed when cargo was offloaded. This example shows the way both parameters change when cargo is onloaded.

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Aerodynamic optimisation of wings in multi-engined tractor propeller arrangements by L. L. M. Veldhuis, P. M. Heyma


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