David F. Plummer
May 26, 2003, 06:42 PM
Hi!
I'm building a 1/16th scale model of the Martin P6M-2 4-jet flying boat; the wing is swept 40 degrees (referenced to the 1/4 chord line); span is 102.3 ft (77.2" on the model); wing area is 7.42 ft-sq on the model. The T-tail horiz. stab. is also swept at 40 degrees (ref. to 1/4 chord), and has a span of 30 ft (22.5" on the model). Is the geometric method described by Martin Simons (Figure 12.13 of his Model Aircraft Aerodynamics, fourth edition) a reasonably acceptable method for locating the neutral point for the model; would a static margin of 0.15-0.2 be a reasonable starting point for CG location?
Any comments/help/suggestions would be appreciated.
Dave Plummer
I'm building a 1/16th scale model of the Martin P6M-2 4-jet flying boat; the wing is swept 40 degrees (referenced to the 1/4 chord line); span is 102.3 ft (77.2" on the model); wing area is 7.42 ft-sq on the model. The T-tail horiz. stab. is also swept at 40 degrees (ref. to 1/4 chord), and has a span of 30 ft (22.5" on the model). Is the geometric method described by Martin Simons (Figure 12.13 of his Model Aircraft Aerodynamics, fourth edition) a reasonably acceptable method for locating the neutral point for the model; would a static margin of 0.15-0.2 be a reasonable starting point for CG location?
Any comments/help/suggestions would be appreciated.
Dave Plummer