Sidewinder

Sidewinder (pronounced syde-whine-der)

(1) A North American rattlesnake (Crotalus cerastes), also known as the horned rattlesnake and sidewinder rattlesnake, a venomous pit viper species belonging to the genus Crotalus (rattlesnakes) and found in the desert regions of the south-western United States and north-western Mexico. 

(2) An air-to-air missiles of US design.

(3) In nautical use, a type of middle-distance deep-sea trawler widely used during the 1960s and 1970s.

(4) In slang, a person thought untrustworthy and dangerous.

(5) In the slang of hand-to-hand combat, a heavy swinging blow from the side which disables an adversary (now rare).

(6) In the slang of baseball, a pitcher who throws sidearm.

(7) In the slang of certain photographers, a certain aspect used to photograph certain models in certain dresses or tops.

1875: A creation of US English to describe the small horned rattlesnake found in the south-west near the border with Mexico, the construct being the adjective side + the agent noun of wind, so called in reference to its "peculiar lateral progressive motion".  The first known use was in an 1875 US Army report detailing the zoology of the western US.  Dating from 1888, there are also references to the snake as the "sidewiper".  Side was from the Middle English side, from the Old English sīde (side, flank), from the Proto-Germanic sīdǭ (side, flank, edge, shore), from the primitive Indo-European sēy- (to send, throw, drop, sow, deposit).  It was cognate with the Saterland Frisian Siede (side), the West Frisian side (side), the Dutch zijde & zij (side), the German Low German Sied (side), the German Seite (side), the Danish & Norwegian side (side) and the Swedish sida (side).  As an adjective (as in sidewinder) it's used to mean (1) being on the left or right, or toward the left or right; lateral & (2) indirect; oblique; incidental.  The construct of winder was wind + -er and was from the Middle English wynder, from the Middle English wynd & wind, from the Old English wind (wind), from the Proto-West Germanic wind, from the Proto-Germanic windaz, from the primitive Indo-European hwéhtos (wind), from hwéhts (wind), from the present participle of hweh- (to blow).  The –er suffix was from the Middle English –er & -ere, from the Old English -ere, from the Proto-Germanic -ārijaz, thought most likely to have been borrowed from the Latin –ārius where, as a suffix, it was used to form adjectives from nouns or numerals.  In English, the –er suffix, when added to a verb, created an agent noun: the person or thing that doing the action indicated by the root verb.   The use in English was reinforced by the synonymous but unrelated Old French –or & -eor (the Anglo-Norman variant -our), from the Latin -ātor & -tor, from the primitive Indo-European -tōr.  When appended to a noun, it created the noun denoting an occupation or describing the person whose occupation is the noun.  Sidewinder is a noun; the noun plural is sidewinders.

A sidewinder taking lunch (left) and sidewinding (right).

The snake’s common name, sidewinder, alludes to its unusual form of locomotion, which is thought to give it traction on windblown desert sand, but this peculiar specialization is used on any substrate over which the sidewinder rapidly can move. As its body progresses over loose sand, it forms a letter J-shaped impression, with the tip of the hook pointing in the direction of travel.  The species is nocturnal during hot months and diurnal during the cooler times of its activity period, which typically extends from November to March (though often longer in the southern part of its range, subject to seasonal variation).

The AIM-9x Sidewinder and the Vympel K-13

AIM-9x Sidewinder Air-to Air missile being launched.

The AIM-9x Sidewinder is a short-range air-to-air missile developed by the US Navy which entered service in 1956.  One of the most widely used missiles, it equips both western and (notionally) non-aligned air forces as well as (indirectly), the many nations which use the Soviet-era Vympel K-13, a reverse-engineered clone.  More than 110,000 Sidewinders have been produced and it’s considered outstanding value for money, being one of the less expensive weapons of its type.  Aside from cost, it owes its longevity to a simple, easy-to-upgrade design, long shelf life, robustness and famously high reliability; the US military say it’s possible the Sidewinder will remain in service until late this century, the one basic design might thus endure over one-hundred years.  One of the early mass-produced guided missiles, the Sidewinder name was selected in 1950 because the venomous snake uses infrared sensory organs to hunt warm-blooded prey.  The Sidewinder was first developed by the US Navy (USN) and later adopted by the US Air Force (USAF), both branches still using what is essentially the same design, the critical components of which are (1) an infrared homing guidance section, (2) an active optical target detector, (3) a high-explosive warhead and (4) rocket propulsion.  The attraction of infrared units is their low-cost, ease of maintenance and the ability to be used day and night.  According to the 2021 fiscal year Department of Defense (DoD) budget, AIM-9x Sidewinders are costed at around US$430,000 for Navy use & US$472,000 for the Air Force, the difference accounted for by the cost of the mounting system which attaches to and aircraft’s hard-points.  The DoD’s numbers are not necessarily accurate but the comparative values are probably at least indicative.

The rollerons on the fins of the early AIM-9.

Although in production since 1956, the Sidewinder is now a much changed device, product development meaning parts interchangeability between an original and one from the 2020s is limited to the odd screw.  In that, the missile can be compared to something like the Volkswagen Beetle in that while the first in 1938 and the last in 2003 were recognizably related and conceptually the same (rear-mounted air-cooled flat-four engine, rear-wheel drive (RWD), separate chassis etc), the only mechanical carry-overs would be some of the nuts & bolts.  In the 1950s, the technology to permit the Sidewinder's fins to act as self-stabilizer didn't exist.  While it would have been possible to build an electro-mechanical device which could fulfil the function, it would have been prohibitively large and heavy and, when subject to the stresses of launch, anyway too fragile to provide the reliability the military required.  Instead, "rollerons" were fitted to the tips of the fins.  Rotating at 100,000 rpm, these provided gyroscopic stabilization, a solution similar to that adopted by the Germans for their big World War II (1939-1945) ballistic missile (The Aggregat 4 (A4), better known as the V2 (or V-2) (Vergeltungswaffe (Retaliation (ie vengence) Weapon 2)) although being bigger and flying for a greater distance in a more complex trajectory, the V2 was fitted also with controllers on the rocket engine's vanes which compensated dynamically for directional variations.  The issue of directional stability was the most challenging aspect of the V2's development. 

Lindsay Lohan sidewinder shots, 2007.  Where possible, photographers like to take both SFW (suitable for work, left) shots and NSFW (not suitable for work, right) shots so they have product for both market niches.  Paul Smith shot these as part of a sequence at the General Motors Annual Ten Event Fashion Show, Los Angeles, February 2006.

The use of Sidewinders in dog-fights between Chinese and Taiwanese (from the renegade province of Taiwan) pilots during the Second Taiwan Strait Crisis (1958) was the first use of air-to-air guided missiles in combat and the Vympel K-13 (NATO reporting name: AA-2 (Atoll)) was reverse-engineered (ie pirated) by the Soviet Union, using a Sidewinder launched from a Taiwanese F-86 Sabre during the Crisis which became lodged, unexploded, in the fuselage of a Chinese MiG 17.  The MiG landed safely and although Sino-Soviet relations weren’t at the time ideal, some sort of deal was done between Peking and Moscow which resulted in the missile being delivered to Soviet weapons scientists who deconstructed and replicated it, allowing the Vympel to enter the arsenals of Warsaw Pact nations.  The USSR had something of a tradition of doing this with Western hardware (their Boeing B29 clone legendarily almost identical to Boeing’s original) and the Chinese soon became masters of the technique.  By 1961 the K-13 was in full-scale production and so diligent were the Soviets in their duplication that even the part-numbers stamped on the components were replicated.

In February 2023, the Sidewinder was briefly in the news after one was used by a USAF F-16 fighter to shoot down the balloon which infamously penetrated US airspace.  Depending on whose story one prefers, it was either a weather research device operated by Chinese meteorological authorities or a spy system run by the PLA (People’s Liberation Army) to gather data for the Chinese Communist Party (CCP).  Most observers not in fear of being sent to a re-education camp seem to tend to the latter but for the USAF it wasn’t that important; pilots just like shooting stuff with sidewinders.  Targeted at an altitude around 20,000 feet (6000 m), the balloon was brought down in the vicinity of Lake Huron above over Michigan and was the third such airborne object shot down in a three-day span, all at the time believed to be linked with the CCP.  Once the thing was downed, one of the main interests to those examining the wreckage was to work out how a relatively large object could have evaded the surveillance of the North American Aerospace Defense Command (NORAD), which uses visual contact, radar, and other tracking systems.

1997 Dodge Dakota Sidewinder Concept.

The Dodge Dakota Sidewinder was a one-off concept displayed at 1997’s SEMA Convention in Las Vegas.  It used a 640 hp (477 kW), 490 cubic-inch (8.0 litre) V10 Viper (LA) engine and was said to be capable of 170 mph (274 km/h) although it wasn’t clear whether this was (1) worked out on the back of an envelope, (2) calculated by computer simulation or (3) verified by some intrepid test driver.  Like most of Detroit’s more fanciful creations, it never reached production although Chevrolet later picked up the idea for their retro-styled SSR (Super Sport Roadster) pickup truck (2003-2006) which featured a retractable hard-top and between 2004-2006 Dodge did install the a 505 cubic inch (8.3 litre) version LA V10 in their Ram pick-up truck.  One of the crazier trucks and very much in the tradition of their 1964-1966 D-100 pick-up which used the 426 cubic inch (7.0 litre) Street Wedge V8, the limited-production V10 SRT-10 is still much in demand in the collector market.