Schaufele Annotations

The DC-9 has been one of the work-horses of the airline industry since 1965, and has been stretched and re-engined many times. Preliminary design was started in 1962, with first flight in February 1965. The airplane entered service with Delta Airlines later that year. The last delivery of one of its derivatives, the MD-87, was in December 1999.

In retrospect, installing the engines on the rear fuselage was not the correct decision. Although the landing gear and airstairs could both be shorter, thus saving weight, the advent of turbofan engines, which were heavier than turbojets, resulting in higher wing root and fuselage bending moments, and thus additional weight, as compared with wing-mounted engines.

The design is used in many of the examples in Schaufele's "The Elements of Aircraft Preliminary Design". This textbook is used in undergraduate senior year or graduate level courses at several universities, including California State University Long Beach, University of California Irvine, and Arizona State University.

1 Review of Basic Concepts rev 4

3 Preliminary Estimate of Maximum Takeoff Gross Weight rev 8

4 Preliminary Wing Design rev 3

6 Horizontal and Vertical Tail Sizing rev 10

7 Landing Gear Design rev 3

8 Engine Sizing and Arrangement rev 7

9 Baseline 3-View Layout Drawing

10 Preliminary Weight and Balance Drawing rev 4

11 Estimated Low Speed Lift Curves and Maximum Lift Coefficients margin notes

12 Detailed Drag Buildup for Cruise, Takeoff, and Landing rev 4

13 Operational Envelope and Estimated Aircraft Buffet Boundary

13 Operational Envelope and Estimated Aircraft Buffet Boundary margin notes rev 2