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Angle between a helix and an axial line
In mechanical engineering, a helix angle is the angle between any helix and an axial line on its right, circular cylinder or cone. Common applications
Helix_angle
Space curve that winds around a line
of the angle indicating direction from the axis. A curve is called a general helix or cylindrical helix if its tangent makes a constant angle with a fixed
Helix
cylinder. Base helix angle is the helix angle on the base cylinder of involute helical teeth or threads. Base lead angle is the lead angle on the base cylinder
List_of_gear_nomenclature
Rotating circular machine part with teeth that mesh with another toothed part
the helix angle of one having the negative of the helix angle of the other; such a pair might also be referred to as having a right-handed helix and a
Gear
number of "starts". Lead angle is the angle between the helix and a plane of rotation. It is the complement of the helix angle, and is used for convenience
Lead_(engineering)
Milling cutter designed to cut axially
full-width plunging cuts); and categorization by number of flutes; by helix angle; by material; and by coating material. Each category may be further divided
End_mill
Type of secondary structure of proteins
An alpha helix (or α-helix) is a sequence of amino acids in a protein that are twisted into a coil (a helix). The alpha helix is the most common structural
Alpha_helix
Aircraft propulsion component
propeller is influenced by the angle of attack (α). This is defined as α = Φ - θ, where θ is the helix angle (the angle between the resultant relative
Propeller_(aeronautics)
Planetary nebula in the constellation Aquarius
viewing angle. The Helix Nebula has sometimes been referred to as the "Eye of God" in pop culture, as well as the "Eye of Sauron". The Helix Nebula is
Helix_Nebula
Low-friction linear actuator
bearing's geometry, ignoring the shape of the section's profile and the helix angle. In particular, the first principal curvature is calculated as κ 1 s
Ball_screw
Process of creating a screw thread
one variant of form-milling, the single-form cutter is tilted to the helix angle of the thread and then fed radially into the blank. The blank is then
Threading_(manufacturing)
the behavior of a file. Helix angle – Helix angle is an angle between the cutting edge and the long access of a file. Helix angle plays an important role
Nickel_titanium_rotary_file
Tool bits used in milling machines
an angle allows the tooth to enter the material gradually, reducing vibration. Typically, finishing cutters have a higher rake angle (tighter helix) to
Milling_cutter
Mechanical part
spiral angle in a spiral bevel gear is the angle between the tooth trace and an element of the pitch cone, and corresponds to the helix angle in helical
Spiral_bevel_gear
Structure formed by double-stranded molecules
In molecular biology, the double helix is the structure formed by double-stranded molecules of nucleic acids such as DNA. The double-helical structure
Nucleic_acid_double_helix
Type of protein secondary structure
polyproline II helix (PPII, poly-Pro II, κ-helix) is formed when sequential residues all adopt (φ,ψ) backbone dihedral angles of roughly (-75°, 150°) and have trans
Polyproline_helix
Protein structural motif
acute angle of ~25–50° that dictates the characteristic pattern of hydrophobicity in the sequences, while other DNA-binding structures like the helix-turn-helix
Helix-hairpin-helix
of the lobe. The lobe has a helical slot machined into it that has a helix angle of about 35° relative to the rotational axis of the camshaft. The width
Helical_camshaft
Type of secondary structure
the dihedral angles for an α-helix is roughly −105°, whereas that for a π-helix is roughly −125°. The general formula for the rotation angle Ω per residue
310_helix
Clearance between mating components
required in a gear train include errors in profile, pitch, tooth thickness, helix angle and center distance, and run-out. The greater the accuracy the smaller
Backlash_(engineering)
Device which converts input forces and motion to output forces and motion
freedom because the sliding and rotational motions are related by the helix angle of the thread. Higher pairs: Generally, a higher pair is a constraint
Mechanism_(engineering)
Process used to cut teeth into gears
held at the lead angle of the hob, whereas if a helical gear is being produced, the held at the lead angle of the hob plus the helix angle of the helical
Hobbing
Secondary protein structure
A pi helix (or π-helix) is a type of secondary structure found in proteins. Discovered by crystallographer Barbara Low in 1952 and once thought to be
Pi_helix
Type of cutting tool
Harder materials require a larger point angle, and softer materials require a sharper angle. The correct point angle for the hardness of the material influences
Drill_bit
principle that any two gears will mesh if they are of the same pitch, proper helix angle, and proper tooth depth and thickness. By using a gear-shaped corresponding
Gear_shaping
Helical structure used to convert between rotational and linear movement or force
screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the former being called a straight thread and the latter called a
Screw_thread
Type of mechanical seal
contamination resistance, etc. Research emphasizes that groove shape, helix angle, width/depth ratio, number of grooves, and other parameters significantly
Hydrodynamic_seal
British X-ray crystallographer (1920–1958)
DNA, which eventually facilitated the correct description of the double helix structure of DNA. Owing to disagreement with her director, John Randall
Rosalind_Franklin
Antenna with conducting wires in a helix
maximum radiation at right angles to the helix axis. For monofilar designs the radiation is linearly polarized parallel to the helix axis. These are used for
Helical_antenna
Manufacture of electromagnetic coils
needle stroke, the rotation angle of the stator (number of poles), the wire diameter and the slot channel width and the helix angle of the angularly slotted
Coil_winding_technology
Species of gastropod
was first described by Richard Thomas Lowe, in 1831, as Helix rotula, part of the genus Helix. This species is endemic to the Porto Santo Island, Madeira
Callina_rotula
Woodworking power tool
2026-06-10. Su, Wen -Ching; Wang, Yiren (2002-04-01). "Effect of the helix angle of router bits on chip formation and energy consumption during milling
Router_(woodworking)
Curve that winds around a central point
generated while coiling a carpet. A hyperbolic spiral appears as image of a helix with a special central projection (see diagram). A hyperbolic spiral is
Spiral
The steering box contains an "hour glass" cam machined with a varying helix angle to provide the variable steering ratio. In common with other power steering
Marles_steering_gear
Spiral asymptotic to a line
with a pitch angle that increases with distance from its center, unlike the constant angles of logarithmic spirals or decreasing angles of Archimedean
Hyperbolic_spiral
Genus of flowering plants in the family Araliaceae
climbing ornamentals, and the name ivy especially denotes common ivy (Hedera helix), known in North America as "English ivy", which is frequently planted to
Hedera
Optical filter device
field rotates as the wave passes a given point in space. The helix also forms a left-handed helix in space. Similarly this light is considered counter-clockwise
Polarizer
Structural motif in proteins above the secondary structure level
almost at right angles to each other connected by a short 'loop'. This loop is formed from a hydrophobic residue. The function of a helix corner is unknown
Supersecondary_structure
Visual representation of allowable protein conformations
energetically allowed regions for backbone dihedral angles (also called as torsional angles, phi and psi angles) φ against ψ of amino acid residues in protein
Ramachandran_plot
Type of jewelry and body piercing
no particular order is lobes, middle helix, helix, forward helix, industrial, daith, tragus, flats, hidden helix, rook, snug, conch, contra conch, anti
Earring
Surgery to correct the deformities and defects of the auricle
depression separating the helix and the antihelix). The degrees of angle between the head and the ear, and the degrees of angle between the scapha and the
Otoplasty
Visible part of the ear that is outside the head
next to the ear canal Conchal angle is the angle that the back of the concha makes with the side of the head Crus of the helix is just above the tragus Cymba
Auricle_(anatomy)
Plane spiral projected onto the surface of a cone
In mathematics, a conical spiral, also known as a conical helix, is a space curve on a right circular cone, whose floor projection is a plane spiral.
Conical_spiral
Self-stabilizing region of a protein that binds to specific DNA sequences
acute angle of ~25–50° that dictates the characteristic pattern of hydrophobicity in the sequences, while other DNA-binding structures like the helix-turn-helix
DNA-binding_domain
American enterprise software company
In 2025, the company's Helix product was spun off into the independent IT service and operations-focused company, BMC Helix. The company was founded
BMC_Software
Construction that bridges a large vertical distance with steps
helical shapes. Ascending a right-handed helix rises counter-clockwise, while ascending a left-handed helix rises clockwise (both as viewed from above)
Stairs
Potential conformation of DNA
helical structures along with B-DNA and Z-DNA. It is a right-handed double helix fairly similar to the more common B-DNA form, but with a shorter, more compact
A-DNA
Polarization state
right angle to the electric field vector and proportional in magnitude to it. As a result, the magnetic field vectors would trace out a second helix if displayed
Circular_polarization
Intermolecular attraction between a hydrogen donor-and-acceptor pair
positions i and i + 4, an alpha helix is formed. When the spacing is less, between positions i and i + 3, then a 310 helix is formed. When two strands are
Hydrogen_bond
Mnemonic for 3D vectors orientations and rotations
a helix, all the field lines inside the helix point in the same direction and each successive coil reinforces the others. The advance of the helix, the
Right-hand_rule
Type of biological prediction
libraries present different dihedral angles and/or rotamer frequencies for α {\displaystyle \alpha } -helix, β {\displaystyle \beta } -sheet, or coil
Protein_structure_prediction
audio track related to their chosen language or video camera angle. 14 April 2012 - Helix Universal Media Server version 14.3 launched enhancements include
Helix_Universal_Server
Video gaming brand owned by Microsoft
that a 2027 launch is possible. The codename for the next Xbox, Project Helix, was announced in March 2026. The console is expected to support both Xbox
Xbox
Roller coaster at Canada's Wonderland
into a downward 540-degree helix. Immediately following the first helix, the train climbs into an upward 270-degree helix to the left. Following the climb
Behemoth_(roller_coaster)
Textile technology
twisted core surface and are wrapped helically over the core with varying helix angles. It is believed that the false twist in the core gets removed once the
DREF_friction_spinning
Protein structure classification tool
this, nine types of secondary structure are assigned. The 310 helix, α helix and π helix have symbols G, H and I and are recognized by having a repetitive
DSSP_(algorithm)
Wooden roller coaster at Kings Island
discovered during early testing delayed plans to build an enclosure over the helix finale until 1980. Ruth Voss, the park's public relations manager who would
The_Beast_(roller_coaster)
Roller coaster in Farmington, Utah
into the G-inducing helix back to the station. This helix is sometimes referred to as a 'slanted spiral' or the 'upward-downward helix,' because it turns
Colossus_the_Fire_Dragon
Non-planar polygon with infinitely many sides
and blue, each with a twist angle of 60° and with a Schläfli symbol {∞} # {6}. A sequence of edges of a Boerdijk–Coxeter helix can represent infinite regular
Infinite_skew_polygon
2008 video game
Silent Hill: Homecoming is a 2008 survival horror game developed by Double Helix Games and published by Konami. The sixth installment in the Silent Hill
Silent_Hill:_Homecoming
One of many possible double helical structures of DNA
structures of DNA. It is a left-handed double helical structure in which the helix winds to the left in a zigzag pattern, instead of to the right, like the
Z-DNA
Steel rollercoaster at Gardaland
outside Verona, Italy. It is an extended standard model, with additional helix, of the Suspended Looping Coaster manufactured by Vekoma. The ride's highest
Blue_Tornado_(roller_coaster)
Geometrical property
to its original appearance. A helix-like object is one that has at every point the regular angle of coiling of a helix, but which can also have a cross
Symmetry_(geometry)
Transparent dental braces
aligners in controlling orthodontic tooth movement: A systematic review". Angle Orthod. 85 (5): 881–9. doi:10.2319/061614-436.1. PMC 8610387. PMID 25412265
Clear_aligners
tilted at an angle. It is not entered vertically, like a vertical loop, or horizontally like a helix. Instead, it is usually entered at an angle between 45°
List of roller coaster elements
List_of_roller_coaster_elements
Data visualisation for protein structure
visualize dihedral angle distributions in protein structures. While a Ramachandran plot relates the two backbone dihedral angles, a Janin plot relates
Janin_Plot
Mechanism that converts motion, and forces, from rotational to linear
not necessarily have a shaft or threads. For example, a corkscrew is a helix-shaped rod with a sharp point, and an Archimedes' screw is a water pump
Screw_mechanism
Polyhedron with four faces
{\displaystyle \sin \angle OAB\cdot \sin \angle OBC\cdot \sin \angle OCA=\sin \angle OAC\cdot \sin \angle OCB\cdot \sin \angle OBA.} One may view the
Tetrahedron
Steel roller coaster in Georgia, US
(39 m) drop. Next, the train rises back up and enters a 540-degree downward helix before passing through a set of trim brakes and going over the third camelback
Goliath (Six Flags Over Georgia)
Goliath_(Six_Flags_Over_Georgia)
British roller coaster at Chessington World of Adventures
small boost via a launch before beginning to ascend a 405° upward helix. This helix spirals around the central theming feature of the area, the ‘Jaguar
Mandrill_Mayhem
Protein structural motif
and nonpolar/greasy environments. Collagen helix Foldamers Folding (chemistry) Tertiary structure α-helix Structural motif "Animated GIF made by adapting
Beta_sheet
Type of spring
axis. A helical torsion spring, is a metal rod or wire in the shape of a helix (coil) that is subjected to twisting about the axis of the coil by sideways
Torsion_spring
Former steel roller coaster at Oakwood Theme Park
heartline roll, then turned left with a slight incline and entered a double helix that led into the final brake run. The train completed the circuit with
Speed:_No_Limits
Launched roller coaster in Beijing
corkscrew and a turnaround. The train then tilts sideways as it enters a helix, which ends at the coaster's final brake run. 2021 in amusement parks The
Decepticoaster
Protein-coding gene in the species Homo sapiens
50 amino acid residues (117-169 amino acids). The motif is found on an α-helix, which enhances the binding of the protein. The name of the domain arises
Myocilin
General three-dimensional form of local segments of proteins
defines: G = 3-turn helix (310 helix). Min length 3 residues. H = 4-turn helix (α helix). Minimum length 4 residues. I = 5-turn helix (π helix). Minimum length
Protein_secondary_structure
Hand tool used for turning screws
helix. The brothers Job and William Wyatt found a way to produce a screw on a novel machine that first cut the slotted head, and then cut the helix.
Screwdriver
Defunct steel rollercoaster at Stratosphere Tower, Las Vegas
Track layout Helix Lift/launch system Tires Drop 20 ft (6.1 m) Length 865 ft (264 m) Speed 30 mph (48 km/h) Inversions 0 Duration 0:40 Max vertical angle 13° Capacity
High_Roller_(Stratosphere)
Steel roller coaster in Chorzów, Poland
The train then enters into an outer-banked airtime hill into a 270 degree helix to the left, followed by another twisted airtime hill into a 180 degree
Lech_Coaster
Euclidean space surface
such that the displacement is proportional to the rotation-angle. The result is a circular helix. If the axis is the z-axis, the motion of a point P 0 =
Generalized_helicoid
Steel roller coaster
identical to Titan at Six Flags Over Texas, but it lacks a 540-degree upward helix prior to the mid-course brake run and features a slightly shorter track
Goliath (Six Flags Magic Mountain)
Goliath_(Six_Flags_Magic_Mountain)
Defunct roller coaster in Virginia, US
A train on the double-helix element
Shockwave_(Kings_Dominion)
American electric VTOL aircraft
in the process of starting production of the BlackFly's successor, the Helix, at Pivotal's Palo Alto, California site. The BlackFly is the world's first
Pivotal_BlackFly
Steel roller coaster at Six Flags México
veering to the left. They then climb a smaller slope and come down into a helix section, still veering left. The train then crests the second camelback
Superman_El_Último_Escape
Mathematical shape
1776. Its name derives from its similarity to the helix: for every point on the helicoid, there is a helix contained in the helicoid which passes through
Helicoid
Penis piercing
Frenum piercing from several angles
Frenum_piercing
Racing coaster at Cedar Point
stretches of airtime hills, with the finale consisting of a banked upward helix into the brake run. Gemini has one of the highest capacities of any ride
Gemini_(roller_coaster)
Superfamily of oxygen-transporting globular proteins
an average angle of about 50 degrees, significantly steeper than other helical packings such as the helix bundle. The exact angle of helix packing depends
Globin
Body piercing, centered usually at the base of the nipple
piercing, centered usually at the base of the nipple. It can be pierced at any angle but is usually done horizontally or, less often, vertically. It is also
Nipple_piercing
Video game franchise
to find his missing brother. It was developed by American company Double Helix Games and released in 2008 for the PlayStation 3 and Xbox 360, and in 2009
Silent_Hill
Former roller coaster at Kings Island
inline twists. Following the inline twists, the train entered the final helix followed by the final "Fly-to-Lie" element. Afterwards, the train was slowed
Firehawk_(roller_coaster)
Protein structure visual representation
reveals whether hydrophobic amino acids are concentrated on one side of the helix, usually with polar or hydrophilic amino acids on the other. This arrangement
Helical_wheel
Steel roller coaster
airtime hill. A 540-degree helix follows, in addition to another smaller airtime hill. The finale involves a 500-degree helix and three more airtime hills
Ride_of_Steel
Steel roller coaster in Japan
being counterclockwise. Following the second helix, the track maneuvers through the supports of the first helix and third hill and makes a left turn into
Steel_Dragon_2000
track, it rises left into a 360 degree helix. After being slowed down by a second splashdown after the helix, it returns to the station. "Speed - Energylandia
Speed_(roller_coaster)
Spinor topology
the two bands will coil around each other in one full twist of a double helix. This is an example of orientation entanglement: the new orientation of
Orientation_entanglement
Soviet transport helicopter
The Kamov Ka-32 (Russian: Камов Ка-32, NATO reporting name "Helix-C") is a Soviet and Russia medium transport helicopter with a coaxial design and two
Kamov_Ka-32
Patterning of metal
Occasionally, the knurled pattern is a series of straight ridges or a helix of "straight" ridges rather than the more-usual criss-cross pattern. Knurling
Knurling
Body part type that consists mainly of muscles with no skeletal support
counter-clockwise torsion it is necessary for a right-hand helix to contract. Contraction of a left-hand helix causes clockwise torsion. The simultaneous contraction
Muscular_hydrostat
Wire used in dental braces
Angle's composition were extremely difficult to reproduce and therefore, the usage of Silver-based alloys did not get popular in orthodontics. Angle was
Orthodontic_archwire
HELIX ANGLE
HELIX ANGLE
Boy/Male
American, Anglo, Australian, British, Chinese, Christian, Czechoslovakian, Danish, Dutch, English, Finnish, French, German, Greek, Hebrew, Irish, Latin, Portuguese, Spanish, Swedish, Swiss
Fortunate; Happy; Name of a Saint; Lucky; Successful
Boy/Male
Christian & English(British/American/Australian)
Prosperous
Girl/Female
Greek
Of the sun.
Male
Greek
(Φῆλιξ) Greek form of Latin Felix, PHELIX means "happy" or "lucky." In the bible, this is the name of a Roman procurator of Judea.
Boy/Male
Anglo Saxon American Spanish Latin Biblical Swedish
Name of a saint.
Girl/Female
Latin
Happy. Feminine of Felix.
Girl/Female
Australian, Finnish
Sun Ray; Shining Light
Girl/Female
Finnish, French, German, Gujarati, Hebrew, Indian, Jain, Sanskrit, Swedish
Sun; Light; Torch; Moon Elope; Glowing; Moon; Continuous Rain; Term of Address for Female Friend
Male
Greek
(Ἡλί) Greek form of Hebrew Eliy, HELI means "ascending." In the New Testament bible, this is the name of the father of Mary's husband Joseph.
Boy/Male
British, English, Indian
Sun
Girl/Female
Australian, British, English, French
Sun's Rays
Boy/Male
Hindu
Ascending, Climbing up
Male
English
Latin name FELIX means "happy" or "lucky." In the bible, this is the name of a Roman procurator of Judea.
Biblical
happy,happy, prosperous,
Girl/Female
Latin American
Happy. Feminine of Felix.
Boy/Male
French, German, Hindu, Indian, Sanskrit
Ascending; Climbing Up; Embrace
Biblical
ascending; climbing up
Girl/Female
Danish, French, German, Greek, Portuguese
Of the Sun; Sun Ray; Shining Light
Surname or Lastname
Swedish (also frequent in Finland)
Swedish (also frequent in Finland) : ornamental name from an unexplained first element + the suffix -lin or -in, common suffixes of surnames.French (Hélin) : from a pet form of Hélie (see Helie 1).French (Hélin) : from the Germanic personal name Heilin, a short form of any of various compound names with the first element heil (see Heilmann 2).English : variant of Hillian.
Boy/Male
Hindu, Indian
Sun
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