• SD7037-PT (Fig. 12.136)

The SD7037 is a thinner, decambered SD7032. As would be expected, the drag is lower, the polar is shifted downward in lift, and the lift range is less. To increase the lift range, flaps would be useful.

The relatively low drag at C; near 0.3 offers good L/D performance which, together with low drag at high lift, should make the SD7037 a popular airfoil, especially for thermal-duration flying. For weak thermal conditions common to east coast soaring in the U. S., the SD7037 would make an excellent cross­country airfoil, but flaps in this case are almost essential to improve high-speed, between-thermal performance.

• SD7037-PT u. s.t. x/c = 30%,h/c = A7%,w/c= 1.0% (Fig. 12.137)

An upper-surface trip at 30% reduces the drag at lower Rn’s only slightly. Although it was not measured, one would expect the drag at 300k to be increased. As with the SD7032, trips are of little benefit.

Also see: FX60-100, SD6080, SD7032, E214 Digitizer plot: Fig. 10.52 Polar plot: Figs, 12.136, 12.137 Thickness: 9.20% Camber: 3.02%

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