Because the blades are attached to a rotor hub by horizontal flapping hinges, which permit their movement in a vertical plane, the advancing blade flaps up, decreasing its angle of attack, while the retreating blade flaps down, increasing its angle of attack.
In his autobiographical novel, The Kindness of Women, JG Ballard glosses his experience of dissection as a Cambridge medical student thus: "As the four teams began to dissect this unknown woman, opening flaps of skin in her limbs, neck and abdomen, she seemed to undress in a last act of self-revelation, unpacking herself of all the mortal elements of her life".
Claire and I resolved early on to prevent any unforeseen disasters; we worked for hours replacing leather buckles with velcro fastenings and shoelaces with elasticated flaps.
"The spooks, who once sat in cubicles steaming open the glued-down flaps of a few dozen suspect envelopes, now have more fertile plains to furrow and the marvellous means to do it.
As we sit on a terrace under bunting that flaps in the cool morning wind, Garay explains that their fruits and seeds once featured prominently in Atacama cuisine and as tourism has grown these traditional recipes have slipped away.
Aircraft-control systems that use computers are capable of mixing the signals required to make the ailerons, flaps and other control surfaces on the wing act together to produce the same effects as the rudder and elevators on the tail would.
Washing flaps from the balconies of what used to be thriving banks, and their once-grand elevators are caked with rust and grime.
Fuel-sipping planes are more profitable, so banks will finance them at lower interest rates.Time to lose weightIn the push to improve efficiency, wing flaps are now operated with lightweight electrical systems instead of hydraulics.
It is also installing stern flaps on its amphibious vehicles that can reduce fuel use by 2-3%, andevelopingng better coatings to prevent the growth of algae and barnacles on hulls that cause drag and increase fuel consumption.In October the USS Makin Island, an amphibious assault ship, was the first of 12 hybrid-powered ships to take to the water.
THE flag of the United Luisita Workers Unionn flaps in the breeze rolling across Hacienda Luisita, a vast sugar plantation named after a Catalonian marchioness, 100km (60-odd miles) north of the capital, Manila.
As the crystal vibrates, the Mylar blade flaps back and forth like a Japanese fan, albeit a good deal faster.Technology Quarterly A lemon law for software?
