Anhedral: Meaning, Synonyms, Antonyms, Translation, Use Cases.

Anhedral

Anhedral  (noun) / (ænˈhiːdrəl) /

“This is why most aerobatic planes and military fighters utilize some amount of anhedral”.

Anhedral (adjective) [ an-hee-druhl ]

  • a rock texture without crystal faces or cross-section shape in thin section.

“Pabstite commonly occurs as anhedral crystals and masses that vary in their color from colorless to white”.

  • Lacking sharp, recognizable crystal faces.

Anhedral in Aeronautics

Anhedral angles are often seen on aircraft with a high mounted wings such as the very large Antonov An-124.

In such designs, the high mounted wing is above the aircraft’s center of gravity.

It confers extra dihedral effect due to the pendulum effect and so additional dihedral angle is not required.

Such designs can have excessive dihedral effect and so be excessively stable in the spiral mode.

This angle on the wing is to cancel out the dihedral effect so the aircraft can be more easily maneuvered.

 

In Geology

Also known as Allotriomorphic)

  • a rock composed of mineral grains that have no crystal faces or cross-section shape.
  • used especially on mineral grains of igneous rocks whose mutual growths have prevented the assumption of outward crystal form. 

 

Translation

First recorded in 18951900. Etymology: an-1 hedral

From the Greek word “allotrio-“ + English word “-morphic”.

 

Synonyms

  • Massive
  • Undersaturated
  • Amorphic
  • Amorphous
  • Scaleless
  • Incrystallizable
  • Lusterless
  • Nongranular
  • Anhydrous
  • Depthless

 

Antonyms

  • Dihedral
  • Euhedral
  • Anhypostasia
  • Anhysteretic
  • Anile
  • Anhidrosis

 

Use Cases

  • “It also occurs in anhedral masses and tarnishes on exposure to air”.
  • “The tailplane is straight edged with rounded tips and carries marked anhedral.”
  • “The wingspan is longer, the tail is redesigned with more span and anhedral.”
  • “Dihedral angle (or anhedral angle) has a strong influence on dihedral effect, which is named after it.”
  • Anhedral crystals do not, usually because the crystal is one grain in a polycrystalline solid.”
  • “It crystallizes in the monoclinic system with prismatic, typically twinned forms, though usually anhedral“.

 

Frequently Asked Questions

The curved shape of an aircraft wing helps to reduce the amount of drag created by the wingtip vortices. By reducing the amount of drag, the aircraft flies more efficiently and consumes less fuel.

What is the difference between Anhedral and euhedral?

Euhedral minerals show perfect or nearly perfect crystal faces. Subhedral minerals are rounded but still show the general characteristic shape of that mineral.

These crystals are completely irregular in shape and do not resemble the characteristic form for that mineral.

Why do some planes have Anhedral?

It gives the fighters very nimble flight characteristics, but also makes them more challenging to fly. By using these wings, this roll stability is decreased.

Euhedral forms are developed when a crystal grows freely in a melt and is uninhibited by the presence of any surrounding crystals.
The shape of the growing crystals will thus be controlled by their own natural crystallographic form.
Euhedral crystals (also known as idiomorphic or automorphic crystals) are those that are well-formed, with sharp, easily recognised faces.

Anhedral Video

Summary

 A morphological term referring to grains in igneous rocks which have no regular crystalline shape.
This set of wings induces roll instability and improve roll maneuverability on fighter jets.

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