SHLOKA: Atha vaimanikan lohananukramisyamah saumaka-
Sodasadha bhavantiti te
Meaning: Now we sequence the metals for aircrafts- Thermal (Saumaka), Acidic (Soundalika) and relating to shape (Maurtvika). The aircraft technologists say that by alloying these (three metal categories) 16 varieties of heat-conducting metals come into being.
Meaning: These are heat bearing, heat conducting (thermal), heat proof, shining, acid-proof, toxic (weapon grade) non-malleable, fire proof, weight proof, cold-proof, poison proof (anti toxic), acid proof (alkaline), toxic (weapon grade), surgical grade, wrought metal and wind proof.
Source: Brhad-vimana-sastram, Lohadhikaranam, Maharsih Bharadvajah.
Saumaka= Of the moon= cool= Relating to temperature= Thermal
Saundalika= Relating to juices/acids
Maurtvika= Concerned with shape/form.
Pancha+ghna= Non malleable
Garala+ghna= Poision-proof= Anti-toxin
Amla+hana= Acid-proof= Alkaline
Agni+trd= Fire proof
Ghna, han, trd mean to kill, quench.
The rest are based on positive attributes
Usna+hana= Heat+ bearing
Visma+ bhara= Poision+ bearing= Toxic (weapon-grade)
Usnam+pa= Heat+ protecting= Heat conducting
Raja= Shining= white
Vi+salya+krt= Special+ cut+ Do= Surgical grade
Dvija+mitra= Twice born= Wrought metal
Vatra+mitra= Wind+ friend (wind proof)
There are many Ancient Indian shlokas and sculpture which give an evidence for the excellent planning of the people in the ancient era. The shlokas from Brahad-vimana-sastram explains about the build of aircrafts. It is portrayed in Vimana sastram that aircraft has bird like structure with light body. The metals used for the body of aircraft should be heat proof, Non malleable, Anti-toxin, Acid proof, Weight-proof, wind proof, cold proof and wrought metal. The selection of metals for aircraft should be based on the thermal resistance capacity and light weight. When the aircraft undergoes various environmental conditions the metals of aircraft should have the capacity to sustain the changes. The metals which poses the mentioned qualities will be used in Vimana nirmana. The aircraft technology also came up with an idea of mixing two or three metals to get the combined properties. The combination of metals are known as alloys. Some metals may lack certain feature but may have excellent properties needed for the aircraft. So in order to get over that disadvantage the suitable metals are combined and used.
The modern day aircraft technology also follows the same methodologies in the usage of metals for aircrafts. Right Brothers have designed the flight in a much planed manner. So to meet the design right metals have to be used. Alloys are the most used metals. Alloys are said to possess excellent features like resistance to heat, fire, cold, poison and climatic conditions. The metals should have anti rusting property to have the same brittle and shining appearance. Anti-rusting is very necessary for preventing damage of the aircraft metals.
Even a minute deviation in the design and manufacture of the aircrafts results in huge loss. The aluminium alloy is most commonly used metal alloy. The major element is aluminium and alloying elements may be copper, tin, manganese, silicon, magnesium, zinc and tin. The hardness, low weight, malleability, ductility, elasticity and fusibility is what makes and alloy fit for the aircraft manufacture.