Their original propeller blades are only about 5% less efficient than the modern equivalent, some 100 years later.
The propeller blades must have broken on the other side.
It estimated that about 20 propeller blades fell into this category.
The churning water might suck him into the propeller blades.
The Prairie part of the system did the same with the propeller blades.
Its arms were green propeller blades torn off an old whirlybird.
The turbine looks a little like rows of propeller blades.
The other, he said, is related to the missing propeller blade.
The first thing I checked was the position of the propeller blades.
She remains there today, with starboard propeller blades in the air.
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