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Topic: Dihedral

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	Dihedral - Wikipedia, the free encyclopedia
		Dihedral is the upward angle of an aircraft's (or bird's) wings from root to tip, as viewed from directly in front of or behind the aircraft.
		Dihedral on the wings and tailplane of a Boeing 737
		The purpose of dihedral is to confer stability in the roll axis.
	en.wikipedia.org /wiki/Dihedral (643 words)

	Dihedral - InformationBlast
		Dihedral is the upward angle of an aircraft's wings from root to tip, as viewed from directly in front of or behind the aircraft.
		A popular but erroneous explanation for how it works is that if the aircraft is perturbed such that one wing is lowered relative to the other, dihedral causes the lower wing to increase its surface area relative to the airflow, thus increasing its lift.
		The true explanation for the action of dihedral is this: If a disturbance causes an aircraft to roll away from its normal position, the aircraft will sideslip in the direction of the down-going wing.
	www.informationblast.com /Dihedral.html (432 words)

	(H-J-J-H) Coupling Constant to Dihedral Angle Converter (Site not responding. Last check: 2007-11-01)
		It is therefore dependent upon overlap, and hence upon dihedral angle.
		= 9.5 are constants which depend upon the substituents on the carbon atoms and f is the dihedral angle.
		2.38) to calculate the theoretical dihedral angle in the molecule to assist with molecular modelling.
	www.jonathanpmiller.com /Karplus.html (165 words)

	Calculating the Dihedral of a Wing
		Dihedral is an angle raising the centerline of the wing tip above the centerline of the wing root.
		Dihedral is correctly measured from centerline to centerline.
		Nevertheless, dihedral is sometimes necessary and is especially important for trainer aircraft.
	www.airfieldmodels.com /information_source/math_and_science_of_model_aircraft/formulas/dihedral.htm (451 words)

	Andy Wardley: The Dihedral Active Bridle
		The Dihedral Active Bridle is easier to design and tune than the original Active Bridle, although slightly more time consuming to construct, having two activators instead of one (hence the name).
		This is due to the bridle, and in particular, the the length of the Stabiliser leg and the attachment position of the Stabliser along the lower leg, being particularly sensitive to adjustment.
		The Dihedral Active Bridle allows these adjustments to be made more easily and without affecting the relative lengths of the static bridle on which it may be constructed.
	www.andywardley.com /kites/bridle/dihedral.html (4797 words)

	The world's best place to discuss gliding : Design and Technical : How Much Dihedral?
		Dihedral produces a yaw-to-roll coupling meaning that, in a skidding turn, the advancing wing has a greater angle of attack than the trailing wing so dihedral increases roll rate in the direction of the skiding turn.
		One of the effects of dihedral is to adjust the vertical position of the CG relative to the wing and this directly effects the magnitude of the pendular restoring moment which contributes directly to lateral stability.
		The dihedral requirements for achieving this may conflict with that for the pendular stability problem and thus a compromise may be in order.
	www.gliderforum.com /thread-view.asp?threadid=634&posts=10 (1801 words)

	Aerospaceweb.org \| Ask Us - Wing Twist and Dihedral
		Dihedral is the upward angle of the wing from the vertical when seen from the front, or nose of the aircraft.
		Effective dihedral is the effect of other aspects of the aircraft configuration that produce an effect similar to geometric dihedral.
		When an aircraft with dihedral is yawing to the left, the dihedral causes the left wing to experience a greater angle of attack, which increases lift.
	www.aerospaceweb.org /question/dynamics/q0055.shtml (975 words)

	Dihedral (Site not responding. Last check: 2007-11-01)
		Dihedral is the upward angle of an aircraft 's wings from root to tip as viewed directly in front of or behind the Downward angled wings are said to have anhedral.
		A popular erroneous explanation for how it works is if the aircraft is perturbed such that wing is lowered relative to the other causes the lower wing to increase its area relative to the airflow thus increasing lift.
		The dihedral angle can be seen presenting a positive angle of attack to this lateral flow hence generating additional lift.
	www.freeglossary.com /Anhedral (542 words)

	Dihedral wall, El Capitan, Yosemite - by Henry Wurzer
		But since the route, the dihedral, always leans to the left, the ropes did not bother us on climbing — but we had to get used to it.
		The crack (shallow dihedral) continues (5.10+) and thru grass it leads up to another angular roof, which is passed left.
		Dihedral wall offers free climbing, aid climbing and no notorious bolt ladders (except one rivet section), very little fixed gear and the finish is more alpine style.
	www.terragalleria.com /mountain/info/yosemite/dihedral-wurzer (3835 words)

	MATHEWS: Dihedral Primes (Site not responding. Last check: 2007-11-01)
		Dihedral primes are defined by Mike Keith as integers n which displayed on a calulator have the property that n, n upside down, n in a mirror and n upside down and in a mirror are all primes.
		It's clear that the digits of a dihedral prime are restricted to 0, 1, 2, 5 and 8.
		The first dihedral primes are 2, 11, 101, 181, 1181, 1811, 18181, 108881, 110881, 118081, 120121, 121021, 121151, 150151, 151051, 151121, 180181, 180811, 181081, 188011, 188801,...
	www.wschnei.de /digit-related-numbers/dihedral-primes.html (138 words)

	The Virtual Kite Zoo: Bowed & Dihedral Kites
		Generally speaking, any kite that is traditionally bowed can also be made as a dihedral, and vice versa, and for this reason we group them together, even though some might be harder to make in the alternative form for mechanical reasons, or traditionally are invariably made in one form or the other.
		Modern diamond kites may be either bowed or dihedral, and may have a keel both to aid stability and to avoid the need for a bridle.
		He doesn't seem to have fully appreciated the benefit of a bow or dihedral; the only reason his kites were (moderately) stable is that the cross-spars were sufficiently flexible to bow under wind pressure.
	www.tug.com /kites/zoo/single/bowd/bowd.html (2480 words)

	Calculating Cutting Angles - Woodworking.com
		With a bit of calculating, the requisite dihedral angle of the crown molding parts meeting at the corner can be worked out along with the miter angle of each part resulting in a compound cut.
		Yet to establish the dihedral angle you need to look down a pyramid from its upper point along the arris of the intersecting sides to the bottom corner and measure the angle the sloping faces of the planes form at the bottom corner.
		In a pyramid where the sides lean in from the vertical at 60Â° the dihedral angle is 104.48Â° (with a miter angle of 52.24Â° to join them), and the angle that the triangular sides edges rise from the base line is 63.43Â°.
	www.woodworking.com /article.cfm?article=1640 (887 words)

	Definition of Dihedral from dictionary.net
		Of a kite or an a["e]roplane, having wings that make with one another a dihedral angle, esp. when the angle between the upper sides is less than 180[deg].
		Having two plane faces; as, the dihedral summit of a crystal.
		Dihedral angle, the angular space contained between planes which intersect.
	www.dictionary.net /dihedral (96 words)

	PlanetMath: generalized dihedral group
		This property in fact characterizes generalized dihedral groups, in the sense that if a group
		Cross-references: complement, group, index, subgroup, elementary abelian, free product, isomorphic, dihedral group, cyclic, inverses, maps, order, cyclic group, semidirect product, abelian group
		This is version 6 of generalized dihedral group, born on 2004-12-13, modified 2006-03-19.
	www.planetmath.org /encyclopedia/GeneralizedDihedralGroup.html (102 words)

	Sierpinski's Gasket and Dihedral Symmetry
		The most curious property of (1), in my view, is that, at every step, the picture has the dihedral symmetry of a regular triangle.
		Given an apparent asymmetry of the definitions (1) and (1'), the presence of the dihedral symmetry on every step comes as a surprise.
		It is quite obvious that (3') has the dihedral symmetry, and just a little less so for (3).
	www.cut-the-knot.com /Curriculum/Algebra/SierpinskiGasket.shtml (426 words)

	Dihedral - How Much is Enough? (Site not responding. Last check: 2007-11-01)
		It depends on what you want from your plane; how manuverable or how stable you wish it to be in the rolling axis, whether or not you desire the plane to roll when you deflect the rudder, whether or not you wish the plane to tend to self right when its upset from wings level.
		The dihedral effect is beneficial in self righting, gives us roll coupling with rudder application, and unfortunately, also gives us roll away from a side wind gust.
		And while trainers usually have quite a bit of dihedral, and are wonderfully stable in normal flight, we've all seen them turn vicious in a gusty crosswind, during take off and landing, and even while taxiing on the field.
	www.mindspring.com /~cramskill/dihedral.htm (637 words)

	Complexity Digest - Optimal Measurements for the Dihedral Hidden Subgroup Problem (Site not responding. Last check: 2007-11-01)
		We then prove that the success probability of this measurement exhibits a sharp threshold as a function of the density nu=k/log N, where k is the number of copies of the hidden subgroup state and 2N is the order of the dihedral group.
		Thus the dihedral group provides an example of a group G for which Omega(logG) hidden subgroup states are necessary to solve the hidden subgroup problem.
		In particular, we show that an efficient quantum algorithm for a restricted version of the optimal measurement would imply an efficient quantum algorithm for the subset sum problem, and conversely, that the ability to quantum sample from subset sum solutions allows one to implement the optimal measurement.
	www.comdig.org /article.php?id_article=21166 (264 words)

	Definition of Dihedral angle
		In Aerospace engineering, the dihedral is the angle that the two wings make with each other.
		A dihedral angle (also called the face angle) is the angle at which two adjacent faces meet.
		Thus, the dihedral angle of a cube is 90°, while the dihedral angle of a dodecahedron is 116° 34′.
	www.wordiq.com /definition/Dihedral_angle (220 words)

	ASK DJ Aerotech Question
		Dihedral can have a positive influence on the sink rate in a turn on airplanes whose turning radius is relatively small in comparison to their size, such as HLG's.
		We have found both by test and analysis that the amounts of dihedral typically used in a 2-channel HLG reduces the sink rate.
		If the airplane has lots of dihedral and ailerons, it is possible to have adverse yaw from the ailerons couple with the dihedral and cancel out some or all of the ailerons' roll authority.
	www.djaerotech.com /dj_askjd/dj_questions/turnstall.html (591 words)

	Longitudinal Dihedral - Page 3 - PPRuNe Forums
		Longitudinal dihedral - relative angle of wing and tail - as a very rough and ready design guide, may have some value in indicating typical design choices which provide a good balance between the wing/body integration desire, the desire for a low-ish AoA for the tail in typical conditions and decent trim/control power.
		The presence of a zero-lift pitching moment is common to almost all aircraft and fundamental to exposing the flawed nature of the proportionality argument and longitudinal dihedral as a cause of stability.
		On the issue of logic, I think we'll have to leave the readers to draw their own conclusion as to what is and is not reasonable when it comes to statements involving relationships between variables in systems of many variables.
	www.pprune.org /forums/showthread.php?goto=newpost&threadid=166667 (4307 words)

	dihedral angles
		What we can and will do is to reimplement all methods required by dihedral angle calculation, but these methods will be based on a much simpler (=canonic) 3d vector representation.
		But often when the dihedral angle is exactly 180 degrees it results in NaN (not a number).
		Dihedral angles are measured between -180 and 180 degrees (or 0 to 360).
	www.chemaxon.hu /forum/ftopic408.html&sid=0de7eb7c41809b0394fc4e78561e1d21 (893 words)

	Building tips
		The instructions show a method where the plane is put upside down on the building board with the tip of the vertical fin and one tip of the prop touching the building board.
		My solution was to put some dihedral in the tips also, resulting in a polyhedral plane.
		This holds the wing at the required dihedral to be glued.
	www.luminet.net /~bkuhl/building_tips.htm (875 words)

	Kitfox service advisory 25.
		The first question, regarding dihedral, is easy to answer through the use of a 4 ft. carpenter’s level.
		The final dihedral check is made only after making sure the fuselage is leveled both laterally and longitudinally.
		Because of the dihedral, the bubble will not be centered if the level is held firmly against the spar.
	www.ultralightnews.com /kitfox/kitfoxser25.htm (467 words)

	Mountain Project: Climbing Sunshine Dihedral > The Monkey Skull > South Saint Vrain Canyon > Lyons
		This is the beautiful large right facing dihedral to climbers left of Upside The Cranium.
		The majority of the start and lower portion of the dihedral is 5.8/9 climbing easily protected with small / medium gear.
		After you clip the two bolts it is runout to the start of the dihedral.
	www.climbingboulder.com /rock/db/south_saint_vrain_canyon/the_monkey_skull/sunshine_dihedral.html (754 words)

	Mountain Project: Climbing Fandango Variation > North > Flatirons > Boulder
		Where the dihedral turns left and grows larger, move out right and join back up with Fandango.
		Find an easy way down to this dihedral and follow it until you see a small roof.
		This variation is fun because of the big dihedral and little roof.
	www.climbingboulder.com /rock/db/flatirons_north/first_flatiron/fandango_variation.html (360 words)

	ASK DJ Aerotech Question
		A conventional airplane with or without dihedral sees a reversal in the rudder required to counteract adverse yaw during negative "G" flight.
		For example, in a slow roll to the left, you start with left aileron (which is held throughout the maneuver, although the amount required to keep a constant roll rate varies during various parts of the maneuver), left rudder to counteract the adverse yaw from the ailerons, and some up elevator to hold altitude.
		If you had some dihedral and some sweep, then the roll reversal would still occur at large negative lift coefficients, but the dihedral might dominate at small negative Cl's, resulting in normal behavior for inverted level flight.
	www.djaerotech.com /dj_askjd/dj_questions/sweepdihedral2.html (750 words)

	Re: Addng wings (Site not responding. Last check: 2007-11-01)
		The bottoms of the Dr-1 wings are fuselages as there's no dihedral, and they had to be light blue.
		The bottoms of the Camel wings are wings, due to the dihedral in the bottom wing, and the linen
		: The bottoms of the Camel wings are wings, due to the dihedral in the bottom wing, and the linen : color.
	www.rccad.com /wwwboard/messages/1181.html (464 words)

	Lightning Paddles - Paddle Basics, Blade Shape (Site not responding. Last check: 2007-11-01)
		The dihedral, spoon, and wing above are exaggerated a little for clarity.
		For instance part of a blade is flat and the rest is dihedral, or there could be a little bit of spoon in an otherwise flat blade.
		Dihedrals can be very forgiving, but many are so forgiving that they limit the capabilities of the paddler after the beginner learns the basics.
	www.paddles.com /library/basics7.html (816 words)

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