Flexible composite marine propellers, made of fiber-reinforced plastic (FRP) composites, have a number of advantages over conventional rigid metallic propellers.
In the 24 November issue of Science, researchers unveil a nanoscale propeller made by fastening tiny metal bars atop a protein motor.
He was smuggled close to South Korea on a fishing boat and then, he said, whisked to shore by the type of hand-held propeller made famous in spy movies.
The damaged propeller made this maneuver impossible and the drifting cruiser floated out of the channel and became stuck on a sandbank outside, only partially obscuring the entranceway.
Each propeller makes about 7.5 kilowatts of power that flows back down the cable to the earth.
Something about seeing all those turbine propellers made me think of wartime mobilization, like FDR's ramp-up during the Lend-Lease period or Josef Stalin's decision to send Soviet heavy industry east of the Urals.
The difference between a propeller flap and other pedicled flaps is that the rotation in the case of a propeller flap is "axial": this means that the flaps turn around a pivot that is made of the pedicle and this is similar to a propeller.
The bound ligand resides in the center of the propeller, oriented along the propeller shaft axis with the distal end of the substrate side chain (the dimethyguanidinium group in the case of ADMA, the ureidyl group in the case of l-citrulline) sitting in a negatively charged pocket, made of Asp66, Glu65, and surrounded by a catalytic triad, comprising Glu114, His162, and Cys249.
The propeller-driven Solar Impulse, made of carbon fiber, is powered by four small electric motors and weighs around 3,500 pounds.
