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Topic: Rigid rotor

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Rotational spectroscopy

Quantum number

Vibrational spectroscopy

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Infrared spectroscopy

	B329
		The change in rotor blade velocity to compensate for a change in the distance between the center of mass of the rotor blade and the axis of rotation of the blade as the blade flaps in flight.
		The ratio of the hinge offset divided by the radius of the rotor.
		The tail rotor is an impediment to technological advancements in rotorcraft.
	www.unicopter.com /B329.html (3658 words)

	[No title]
		In general the rigid rotor model involves two point masses placed at a set distance, a significant feature of the model, from their center of mass (4).
		And separations between lines in rigid rotor spectrum (7) (The linear rotor is characterized by a very small I about its molecular axis that can be assumed to have a value of zero, with the other two moments equal to one another (Wallrad 13).
		The knowledge of rigid rotor model, especially for diatomic linear molecules allowed for the development of microwave rotational spectroscopy, helped explain rotations in molecules and even though the model and the spectra are subjected to deviations, they provide us with valuable information about the world on a quantum mechanical level.
	www.scs.uiuc.edu /~chem440a/wozniak.doc (1659 words)

	Rigid rotor - Wikipedia, the free encyclopedia
		An arbitrary rigid rotor is a 3-dimensional rigid object, such as a top.
		An example of a linear rotor is a diatomic molecule.
		An arbitrarily shaped rigid rotor is a rigid body of arbitrary shape with its center of mass fixed in field-free space R
	en.wikipedia.org /wiki/Rigid_rotor (2423 words)

	X-Plane POH - Supplements - Helicopter Tutorials
		Of course, the tail rotor does not have cyclic control, but its operation is similar to collective control on the main rotor, even though it provides the yaw reaction to main rotor torque on the airframe.
		Location of the input links to the rotor blades is related to the phasing of the rotating and stationary controls and also to the amount of blade input rotation required.
		Rigid rotor systems are rare, but may become more common as improvements in material properties and vibration control evolve.
	www.fas.org /man/dod-101/sys/ac/docs/poh/heli-02.htm (1871 words)

	Method for liquid separation - Patent 6019742
		The rigid boundary wall may be large enough to surround the maximum volume that may be taken up by the chamber, or the rigid mounting member may be only large enough to provide a place where the diaphragm may be mounted and where a chuck can hold and spin the rotor.
		The rigid core 116 is covered by a sleeve-shaped elastic diaphragm 31, which is held in place with a air-tight seal by the inner portion of a lower, imperforate interior wall 134 and the inner portion of the (upper) plate 40.
		The rigid core 116 is attached to the air-introduction area 136 and has one or more generally vertical holes in it that act as air conduits from the air-introduction area 136 to the space between the diaphragm 31 and the rigid core 116.
	www.freepatentsonline.com /6019742.html (20535 words)

	Lockheed CL-475
		Much of the problem is attributable to the array of hinges and linkages that alter the path of the rotor blades to maintain balanced lift on all sides of the rotor disc.
		The earliest arrangement was the fully articulated system, which used flapping and lead-lag hinges to allow the blades to compensate for the lift differential between the advancing and retreating blades and the stresses of rotation, vibration and turbulence.
		The term applied to this system is the rigid rotor, which refers to the lack of hinges, and not the stiffness of the blades.
	www.nasm.si.edu /research/aero/aircraft/lockheed_cl475.htm (1631 words)

	MOLSCAT, Version 14, User's manual, Section 3 (Site not responding. Last check: 2007-11-03)
		ITYP = 1 Linear rigid rotor + atom.
		ITYP = 3 Linear rigid rotor + linear rigid rotor.
		ITYP = 4 Asymmetric rigid rotor + linear rigid rotor
	www.giss.nasa.gov /tools/molscat/doc/Section3.html (2889 words)

	Helicopter Aviation
		The rotor system can be said to be rigid in-plane, because the blades are not free to lead and lag, but they are not rigid in the flapping plane (through the use of a teeter hinge).
		The grip attaches the rotor blade to the rotor head, and includes a pitch change mechanism used to change angle of attack by feathering the blade (with the cyclic control).
		Instead, the rotor head is designed with a pre-cone angle to the blade retention system, and other coning forces are simply dealt with by bending of the blades (which must be built stronger to deal with the extra stress).
	www.cybercom.net /~copters/mech/mr_semi.html (1396 words)

	Rotor Configurations
		The tail rotor compensates for the torque that is produced by the main rotor.
		Like the tandem rotor, this configuration doesn't need a tail rotor because the torque is compensated for by the opposite rotation of the rotors.
		Only after the development of the rigid rotor was it possible to build the two rotors closer together and reduce the drag considerably.
	www.centennialofflight.gov /essay/Dictionary/heli_rotor_config/DI54.htm (346 words)

	MODEL 286 Rigid Rotor Helicopter - aeroengineer.net
		The rigid rotor concept developed by Lockheed has opened the way to helicopter flying ease, stability, control, and maneuverability far exceeding other rotorcraft.
		On June 30, 1966, the Model 286 helicopter became the first rigid rotorcraft to win Federal Aviation Administration Type certification, passing with high marks al the rigorous tests imposed in 350 hours of flying by both FAA and Lockheed experts.
		The rigid rotor system, in which the blades are fixed rigidly to the mast, gives a helicopter the easy flying "feel" of a fixed wing aircraft.
	www.aeroengineer.net /history/lockheed/lockheed12.html (169 words)

	0815
		The strong coupling between the rotors and the fuselage may allow the front of the disks to act similar to the canard on a fixed wing craft.
		Yes and no. A single main rotor helicopter with a rotor so rigid that it won't be able to flap won't be able to fly, except perhaps at hover, because there will not be anything to compensate for the dissymmetry of lift between advancing and retreating side.
		A co-axial rotor will be able to fly, but the reason for the absence of cross-couplings is not the rotor stiffness, but the presence of the two counterrotating rotors.
	www.unicopter.com /0815.html (1252 words)

	Energy Calculation for Rigid Rotor Molecules
		The energy of a freely rotating rigid rotor is simply the rotational kinetic energy, which can be expressed in terms of the angular momentum.
		Since the rotational kinetic energy of the rigid rotor can be expressed in terms of the angular momentum, we can imply the form for the Hamiltonian associated with the rotation around a single principal axis.
		For a general rigid rotor with rotations about three principal axes, the energy can be expressed in terms of three rotational constants A, B, C, but the expressions for the energies become more complex.
	hyperphysics.phy-astr.gsu.edu /hbase/molecule/rotqm.html (549 words)

	UniCopter
		A unifying of the compound helicopter's rotor and wing.
		The 'absolutely' rigid and lateral symmetry of the intermeshing rotors should result in a helicopter that performs similarly to a plane.
		The noise level should be significantly less than current helicopters due to the elimination of the tail rotor and the lower speed of the main-rotors.
	www.synchrolite.com /UniCopter.html (833 words)

	Quantum Animations - Rigid Rotor wavefunctions (Site not responding. Last check: 2007-11-03)
		Rigid rotor wavefunctions plotted on the surface of the sphere.
		Leftmost image is a plot of the probability density, i.e., the square of the spherical harmonic:
		Coloured spheres are plots of the phase, with zero phase coloured red.
	web.uvic.ca /~chem347/resources/rigidrotor/rigidrotor.htm (47 words)

	Vertical Reference Helicopter Industry News
		At 10% or less of the rotor radius vertical rotor separation, a 1.41% increase in induced power is required.
		As rotor separation approaches or reaches 25% of rotor radius, the harder the lower rotor has to work to develop and maintain its share of rotor thrust.
		A rotor's advancing blades combine their rotational speed with the helicopter's forward airspeed to produce increased lift on one side of the rotor; the retreating blade, in contrast, subtract their rotational speed from the helicopter's forward airspeed and produce less lift.
	www.verticalreference.com /IndustryNews/IndustryNews.cgi?record=8 (922 words)

	0940
		is the rigid rotor where, because of the flapping stiffness, some of the blade that is out is of the virtual hinge will partially contribute to the gyroscopic precession.
		We have assumed that the angular momentum was all due to the rotation of the rotor.
		The control of the rotor in simple autogyros is direct movement of the teetering hub; this input is in phase with the disk movement.
	www.synchrolite.com /0940.html (8385 words)

	JCE Online: Articles Only@JCE Online: Stark Effects on Rigid Rotor Wave Functions
		The variational method was employed to calculate rotational wave functions and quantum probability functions for a linear rigid rotor, perturbed by the interaction of its dipole moment with an applied electric field.
		However, the calculations were greatly simplified by restricting the rotor to a plane in which the orientation was specified by a single angle.
		As the field increases, the animated classical motion evolves from a free rotor, to a hindered rotor, to a large amplitude pendulum oscillator, and finally to a nearly harmonic librator.
	jchemed.chem.wisc.edu /JCEWWW/Articles/Stark/stark.html (763 words)

	CarterCopter - Lockheed Cheyenne AH56A also unloaded its rotor
		So the only way to change pitch of the rotor blades was by causing the upper gyro-gimbal to tilt in what ever way it could be made to tilt (or in moving the gyro-gimbal vertically if collective pitch changes were commanded).
		Remembering that there are 4 control rods inside the rotor shaft linking the inner race of the lower swash-plate to the upper gyro-gimbal, we now add 4 more control rods, but these go from from the pilot's cyclic servos to the lower swash-plate outer-ring and are connected to it with spring loaded rods.
		As it was a rigid rotor system and taking into account gyroscopic precession forces, the change in blade pitch would cause the whole craft to tilt 90 degress later than maximum (and minimum) pitch.
	www.internetage.com /cartercopters/pics9.htm (1404 words)

	Rigid body dynamics - Wikipedia, the free encyclopedia
		In physics, Rigid body dynamics differs from particle dynamics in that the body takes up space and can rotate, which introduces other considerations.
		Thus, linear momentum equations can be extended to rigid bodies by denoting that they describe the motion of the center of mass of the body.
		When learning about angular motion, students are generally first exposed to the case of rotation only in the x-y plane and a fixed axis or axis at the center of mass with constant rotational inertia.
	en.wikipedia.org /wiki/Rigid_body_dynamics (516 words)

	Helicopters - Rotor Configuration Summary
		One rotor is on top of the other and turn in opposite directions.
		Only after the development of the rigid rotor, has it been possible to build the two rotors closer together and reduce the drag considerably.
		X-Wing project, where the rotor stops during flight and then works as a "normal" wing, will probably not be ready to go into production for a long time (if at all).
	www.helis.com /howflies/rotconf2.php (370 words)

	New theory of rotor dynamics
		Since then, the rotor dynamics became a part of vibration theory and a proving ground to use the fundamental equations of vibration theory.
		When the fundamental equation of the rigid rotor dynamics on flexible shaft is examined carefully, it is clear that these equations are erroneous (see the critical review of rotor dynamics "vibration" theory).
		Authors of this scientific paper have confirmed, that with increase in amplitude of sag of a shaft for a rotor rotation it is necessary to increase a torque.
	www.geocities.com /newrotor (3245 words)

	The Rigid Rotor
		The rigid rotor is a simple model of a rotating diatomic molecule.
		We consider the diatomic to consist of two point masses at a fixed internuclear distance.
		We then reduce the model to a one-dimensional system by considering the rigid rotor to have one mass fixed at the origin, which is orbited by the reduced mass
	vergil.chemistry.gatech.edu /notes/quantrev/node24.html (70 words)

	[No title]
		In addition, we shall see, that the 2D rigid rotor also provides insight into the intrinsic angular momentum of spin 1/2 fermions such as protons and electrons.
		In this sense, the rigid rotor approximations are rather more like the free particle model than even the particle in a box because in the latter at least there is some no-zero value of V for values of x that are 'outside' the box.
		These quantities are illustrated in Figure 1 for the 2D rigid rotator where the xy plane is taken to contain the 'ring' and therefore the angular momentum vectors point in the +z and -z directions, respectively.
	faculty.une.edu /cas/cnash/CH327/Part9PORgood.doc (825 words)

	Rotational Spectra of Rigid Rotor Molecules
		The rotational energies for rigid molecules can be found with the aid of the Shrodinger equation.
		The measurement and identification of one spectral line allows one to calculate the moment of inertia and then the bond length.
		For a rigid rotor diatomic molecule, the selection rules for rotational transitions are
	hyperphysics.phy-astr.gsu.edu /HBASE/molecule/rotrig.html (398 words)

	Quantum Mechanics: Rigid Rotor Applet (Site not responding. Last check: 2007-11-03)
		Sorry, you need a Java-enabled browser to see the simulation.
		This java applet displays the wave functions of the rigid rotor (rigid rotator), which are the spherical harmonics.
		In the center of the applet, you will see the probability distribution of the particle's position.
	www.falstad.com /qmrotator (112 words)

	AH-56A Cheyenne
		Bell entered a scaled-down version of it's Iroquois Warrior.
		The other competitor was the Sikorsky (S-66) (1964) which looked similar to the AH-56A Cheyenne, but had a Rotorprop tail rotor which could rotate on it's axis throught 90° to act both as an anti-torque rotor or as a pusher, thereby transforming the S-66 into a compound aircraft in cruising flight.
		It was armed with an XM52 30mm automatic gun in the belly turret and a XM51 40mm grenade launcher or a XM53 7.62mm Gatling machine gun in the chin-turret, TOWs, and XM200 2.75 inch rocket launchers.
	www.globalsecurity.org /military/systems/aircraft/ah-56.htm (716 words)

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