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Lancair IV, 30.2' span, 98 sq.ft. area, 9.3:1 AR, 0.82
Oswald efficiency factor, 2000# empty, 360# 2 people, 240# fuel, 2.12 ft.sq.
equivalent parasite drag area*.
All following values without regard to prop
thrust or drag:
Best L/D is when drag area equals CDI X 98, 120 mph IAS, ROD 3000
ft./min. straight ahead.
45 deg. turn with induced loss equaling drag area for best
turn L/D at 1.414G, 143 mph IAS, ROD 5050 ft./min., 542' turn radius, 8.2
sec/ 180 deg, 685' altitude loss / 180 deg.
45 deg. turn at 76% of best turn L/D, 109 mph IAS,
ROD 4430 ft./min., 222' turn radius, 4.3 sec/ 180 deg., 323' altitude loss
/ 180 deg.
* Marty Hollman, Modern Aircraft Design, p.13. Marty
did the design of much of the Lancair IV, and designed its high wing
look-alike, the Stallion.
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