2.10.4 Closing Remarks 2102.11 PERFORMANCE. 211 2.1 1.1 Descent and Landing 211 2.11.2 Gliding and Landing… 220 .2.11.3.Maximum LD 225 2.1 1.4 Minimum Rotor Drag 234 2.1 1.5 Autogyro Versus Airplane… 237 2.11 .6 Improvements 249 2.11.7 Drag Reduction..... 259 2.1 1.8 Kellett YO-60 Predicted