CDA HVG 77 Series User Manual download pdf (Page 73)

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vlm.doc Surfaces – User Manual – Vortex-Lattice Module Page 73 of 82

Figure 8-4. Computing the neutral point.

The neutral point was estimated by computing the slope of the CMY curve for two different values of Xcg;

1.85 ft and 2.0465 ft. The corresponding values of CMY for two angles-of-attack (AOA1 and AOA2) was

evaluated (SURFACES provides a tool to make this simple, shown in Figure 8-4). The resulting Xneu is

2.721 ft. This corresponds to:

(

)

MAC

REF

NEU

%3.41

7.5

365.0721.2

100 =

−

V8.3 Results from SURFACES

Summary (note that values from Nelson and Schmidt appear to be from the same source):

Ryan Navion

Source/

Symbol

Flight Stability

and Automatic

Control, R. C.

Nelson

VLM using

SURFACES

Panel Method

using CMARC

(DWT)

Introduction to

Aircraft Flight

Dynamics, Louis

V. Schmidt

Air density

0.002378 slugs/ft

Outside Air Temperature OAT 518.69 °R

Speed of sound ao 1116 ft/s

Altitude H 0 ft

Far field speed Vinf 178 ft/s

Mach Number M 0.159

Baseline AOA AOA - 0.88° 0.76° 0.6°

Reference span Bref 33.40 ft

Source: http://www.aerologic.com/stab/corr.html.

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