This air expands or contracts the turbine case and in doing so, it maintains the accurate clearance between the turbine case and the blade tip.
32.
Blade tips moving near the speed of sound produce the only signal that can be detected when a helicopter is moving slow near terrain and weather.
33.
Abradable coatings are used in aircraft jet engines in the compressor and turbine sections where a minimal clearance is needed between the blade tips and the casing.
34.
:: : : They don't move slowly, they are just so large that the " rotation rate " becomes low for a given speed of the blade tips.
35.
The tapered blade tip sweeps back and angles downward to reduce noise and increase lift . Most of the rotor system components aside from the blades are titanium.
36.
The blade tip modification allowed the helicopter to reach 193 knots ( 222 mph, 357 km / h ) using the maximum auxiliary thrust from the Continental turbojets.
37.
As a benefit to keying from blade tip to bow, a six-or seven-pin interchangeable core key blank can be machined to precisely fit a smaller five-pin system configuration.
38.
An infected Block then arrives and is killed by Earl, shortly before the survivors use the blade tips of their transport helicopter to kill all the remaining zombies.
39.
Its rotors are 144 feet long and spin at 28 revolutions per minute, fast enough for the blade tips to slice through the air at 145 miles per hour.
40.
The 20?swept main rotor blade tips help to overcome a phenomenon called sub-multiple oscillating track ( SMOT ) that causes variations in tip track at high Mach numbers.
