21. Washout may also be used to modify the spanwise lift distribution to reduce lift-induced drag . 22. The drag on an airplane caused by the need to stay afloat is lift-induced drag . 23. The drag coefficient of a lifting airfoil or hydrofoil also includes the effects of lift-induced drag . 24. Another method of reducing induced drag is the use of winglets, as seen on most modern airliners. 25. The lateral wings of a winged keel are usually of moderate aspect ratio and reducing lift-induced drag . 26. This produces a lift distribution close to that of the ideal elliptical wing, with its minimum induced drag . 27. The winglets improve fuel efficiency by five percent and increase range by through the reduction of lift-induced drag . 28. Flying slower than this airspeed reduces range by producing excess induced drag , while flying faster produces excess parasite drag. 29. The optimal wingspan for this weight is about, but airport restrictions limited it to less than, lowering induced drag . 30. Overall, the Poite 3 was an aerodynamically clean aircraft, with a high aspect ratio wing to minimise induced drag .
