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Feathers, et al:
When one studies the SUN 100 course, it can be shown that there are at least 4 turns:
Off the runway, East bound, then to South bound, 92 to 178 degrees (86 deg turn);
East corner turn to West, 178 degrees to 275 (97 deg turn);
West corner to NE, 275 to 41 (126 deg turn); and finally
NE back to the runway, 41 to 92 (51 deg turn) for a total of 360 high speed turning degrees.
Using Fig 2.29 (Constant Altitude, Steady Turn Performance) in "Aerodynamics for Naval Aviators" (NAVWEPS 00-80T-80) on can find that at 200 KTAS and a 60 degree banked turn, the radius is 2000 feet. Thus, Pi x D = 12566 feet or 2.07 Nautical Miles.
The turning radius for 200 KTAS, 30 degrees is about 6000 feet or 3 times that of a 60 degree turn. Thus, taking turns at 30 degrees would add 6.2 NM to the course.
Grayhawk
N92EX
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