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3

Low aspect ratio means more chord. More chord means lower lift coefficient. This will move the operating point of the blade airfoil to a less efficient polar point. Since torque and RPM stay constant, a wider blade cannot absorb more energy and compensates for the higher chord with a proportionally lower lift coefficient. more area. You rightly note that ...


10

Just a guess, but it looks like deicing fluid that dripped onto the hot exhaust cone just after the engine was shut down. The origin of the drops suggests something running off the pylon side panels directly above, and the vertical tracks show that the engine was off, but the cone was still hot enough to bake off the fluid, leaving the runs of glycol ...


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