question: how are rotary autocannons accurate when the barrelsnrotate? Wouldn't the trajectory be skewed?
comment: Let's see, if the gun fires 7200 rounds a minute that's 120 rounds a seconds which means a six barrel gun rotates 20 times a second, with an estimated 5cm radius of the barrel assembly gives you roughly 6.3m/s tangential velocity. Compared with the ~1000m/s exit velocity of the bullet this is almost negligible. That being said those guns tend to fire with the firing barrel on the down stroke so the tangential velocity is vertical which makes it easy to counter by mounting the gun slightly upwards when zeroing it. Aside from that these guns are meant to saturate an area with bullet in short bursts, not really aimed with a scope for high precision but they're accurate enough to hit within a 20m radius over 1000m distance in a burst.
passages: The German Mauser MK 213 was developed at the end of the Second World War and is regarded as the archetypal modern revolver cannon. With multiple chambers and a single barrel, autocannons using the revolver principle can combine a very high rate of fire and high acceleration to its maximum firing rate with low weight, at cost of a reduced sustained rate of fire compared to rotary cannon. They are therefore used mainly in aircraft for AA purposes, in which a target is visible for a short period of time.
  
  Section::::History.:Modern era.
   Section::::Operators.
   Section::::Design details.
  
  The CheyTac system consists of three major components:
  
  BULLET::::1. .408/.375 CheyTac ammunition
  
  BULLET::::2. CheyTac "XTreme Long Distance™" Rifle
  
  BULLET::::3. CheyTac Advanced Ballistic Computer
  
  The CheyTac M200 Intervention is a manually operated, rotating bolt sniper rifle. It features a Picatinny rail on the top of its receiver for mounting various optical sights.
  
  Section::::Design details.:Cartridge.
   To address carbon fouling and a short-barreled timing issue related to traditional AR-15s, POF-USA developed the Regulated Short-Stroke Gas Piston System. Rather than operating gas being injected directly into the upper receiver like a traditional AR-15, the technology pushes a piston that acts on an operating rod, which acts on the bolt carrier, setting extraction and reloading into motion. This action type offers several significant improvements over the direct impingement method. Because hot gases are not injected into the upper receiver, carbon fouling in the action is virtually eliminated. 
   It may be implemented by a single individual. The weapon operator (gunner) fires one or more rounds of ammunition, and the impact point is noted, either by an observer or by the gunner. The aiming point of the weapon is adjusted, and the process is repeated as necessary. Small caliber automatic weapons, either belt or magazine fed, may include a small amount of tracer ammunition (usually 5% or less) in with regular munitions, to facilitate the process under low-light conditions.
   The barrel is interchangeable with other calibres; this can be done in the field in about 15 minutes. With the barrel clamped in a barrel vice, the barrel is removed from the action, and another one screwed into the action and tightened in place with a torque wrench. Newer versions of Accuracy International rifles including the AX, AT (Accuracy Tactical), and AXMC (AX Multi-Calibre) feature a switch-barrel system that allow the user to change out the barrel with only the use of a 4mm hex wrench, allowing field barrel changes in under a minute.
   Autocannons have an automatic firing mode, similar to that of a machine gun. They have mechanisms to automatically load their ammunition, and therefore have a higher rate of fire than artillery, often approaching, or, in the case of rotary autocannons, even surpassing the firing rate of a machine gun. While there is no minimum bore for autocannons, they are generally larger than machine guns, typically 20 mm or greater since World War II and are usually capable of using explosive ammunition even if it isn't always used. Machine guns in contrast are usually too small to use explosive ammunition.
   The three main technologies employed for long-range shooting—the bolt-action rifle, telescopic rifle scope and machined cartridge ammunition—were developed in the nineteenth century. The first bolt-action rifle was produced in 1824 by the German firearms inventor Johann Nicolaus von Dreyse. The first documented telescopic rifle sight was developed between 1835 and 1840 by the American Morgan James. Machined metal-cased cartridge ammunition was first adopted by the British in 1867.
  
  Section::::System requirements.
  
  To qualify as a precision guided firearm, the system must:
  
  BULLET::::- Be a complete firing system – rifle, ammunition and networked tracking scope
   Section::::Models.
  
  Section::::Models.:M61 Vulcan and other designs.
  
  The "M61 Vulcan" 20 mm autocannon is the most iconic member of a family of weapons designed by General Electric and currently manufactured by General Dynamics. The M61 is a six-barreled 20mm rotary cannon, which fires at up to 6,600 rounds per minute. Similar systems are available in calibers ranging from 5.56 mm to 30 mm (the prototype T249 Vigilante AA platform featured a 37 mm chambering).
   Section::::Design details.:Barrel.
  
  The forward barrel trunnion has a non-threaded socket for the barrel and a transverse hole for a pin that secures the barrel in place. On some models the rear trunnion has two extended mounting arms on both sides that support the buttstock; other fixed models use a stepped shaped trunnion that covers the full width of the inside of the receiver.
   Different designs are used for ensuring reliable extraction in manual mechanisms, with most of them being based on the principle of mechanical advantage. The camming action seen in many bolt action rifles is an example of mechanical advantage being used for chambering and extraction. There are examples of some firearm designs being less successful due to poor design around the primary extraction, which can result in a stuck case in the chamber. Notably some pump and straight pull mechanisms are perceived as having the advantage over bolt actions that they are faster and require fewer body movements to operate by the user, however, they are often more complex than traditional bolt action designs, and often have little or no primary extraction lacking the mechanical advantage of a turn bolt which can lead to stoppages. There are some examples of straight pull and pump action rifles notorious for having extraction problems.
   The gun fires at 3,000 rounds per minute in short bursts of 10, 30, 60, or 100 rounds, or it can fire in continuous fire mode at a rate of 1,000 rounds per minute. A linkless feed system is used.
  
  Section::::Performance.
   The AEGs were developed in Japan and the Japanese company Tokyo Marui is credited with creating the original gearbox system. In a Tokyo Marui AEG, the motor drives a train of three gears mounted inside a gearbox, which then loads a pump piston against a spring. Once the spring is released, it pushes the piston plunger forward through the pump cylinder to propel a pellet resting within the chamber forward through the barrel and out of the muzzle. Many manufacturers have now more or less replicated this basic model, adding reinforced parts or minor improvements.
   BULLET::::- Persistently track the target, automatically compute a multi-variable firing solution, and ensure precise engagement when target and firing solution are optimally aligned
  
  Section::::Technology.
  
  The precision guided firearm integrates technology commonly found in drones, tanks, jet fighters, smartphones and microprocessors, into the conventional system.
  
  The following technologies can be integrated in a PGF system: 
  
  BULLET::::- Target acquisition, either through manual designation or auto-acquisition
  
  BULLET::::- Lock on and persistent target tracking
  
  BULLET::::- Computerized firing solution calculation involving ranging and multi-variable ballistic calculation
  
  BULLET::::- Streaming video via wifi server, allowing another user to see the live feed from the system
   Concisely, the target's movement was a vector, and if that didn't change, the generated range, bearing, and elevation were accurate for up to 30 seconds. Once the target's motion vector became stable, the computer operators told the gun director officer ("Solution Plot!"), who usually gave the command to commence firing. Unfortunately, this process of inferring the target motion vector required a few seconds, typically, which might take too long.
   Though most markers in the Trilogy line are mechanical, it is possible to add an electronic trigger frame, which bypasses elements like the integrated 3-way. Later released Eclipse Blade 2 kits had an adapter for this purpose. The Trilogy can also be converted to manual pump-action, similar to the original Sniper line, which makes the integrated 4-way irrelevant.
  
  Section::::External links.
  
  BULLET::::- Worr Game Products
  
  BULLET::::- Planet Eclipse
  
  BULLET::::- Customcockers.com History and gallery site of a group of collectors as well as an autococker, autococking and sovereign oriented forum.
  
  BULLET::::- Photo gallery of various Autococker, past and present
   Section::::History.
   Section::::History.:Garwood Industries minigun.
  
  Garwood Industries created the M134G version with several modifications to the original GE system. The optimum rate of fire was determined by Garwood to be around 3,200 rounds per minute (rpm). The M134G is being produced with this firing rate as well as 4,000 rpm and the previous standard 3,000 rpm rate.
  
  Garwood Industries made several other modifications to the 1960s Minigun design in order to meet modern day military and ISO standards. This includes modifications to the drive motor, feeder and barrel clutch assembly.
  
  Section::::Design and variants.
   Motorized RBGs with rotary barrels are among the latest developments in the world of rubber band guns. In November 2007, Anthony Smith completed the Disintegrator, a 288-shot motorized rubber band gun with 2 12-barrel counter-rotating rotors. This gun can be mounted on a tripod or fired from the hip, and can fire more than 40 rounds per second.
  
  There are two common versions of the rubber band rotary gun mechanism:
  
  Section::::Rubber band gun types.:Rotary.:String-operated.
   BULLET::::- The system is being fitted to Bung Tomo class corvette.
  
  BULLET::::- The system is being fitted to fifteen Swiftships Model 35PB1208 E-1455 patrol boats building for the Iraqi Navy.
  
  BULLET::::- The system is being fitted to three Khareef Class Corvettes building for the Royal Navy of Oman.
  
  BULLET::::- The system is being fitted to newly indigenous built Krabi class offshore patrol vessel (Modified Port of Spain class corvette), Angthong class LPD (Modified Endurance class LPD), Naresuan class frigates (during MLU), HTMS Laemsing Patrol vessels and Inshore patrol vessel T.991-T.996 and DW3000f class frigate
   Another weapon that is similar to the autocannon is the automatic grenade launcher. This is usually mounted on a tripod or on a vehicle and is capable of firing explosive shells at a high rate of fire. The main item of distinction is that they fire very low velocity ammunition. Larger forms of artillery have been fitted with autoloaders, which are different.
  
  Section::::See also.
  
  BULLET::::- List of autocannon
  
  BULLET::::- Recoil operation
  
  BULLET::::- Chain gun
  
  BULLET::::- Gast gun
  
  BULLET::::- Revolver cannon
  
  BULLET::::- Rotary cannon
  
  Section::::Notes.
   Pansarsprängvinggranat m/94 "STRIX" is a Swedish endphase-guided projectile fired from a 120 mm mortar currently manufactured by Saab Bofors Dynamics.
  
  STRIX is fired like a conventional mortar round. The round contains an infrared imaging sensor that it uses to guide itself onto any tank or armoured fighting vehicle in the vicinity where it lands. The seeker is designed to ignore targets that are already burning.
   Section::::Models.:Self-driven examples.
  
  While electric motors were used to rotate the Vulcan barrels, a few examples of self-operated Gatling-derived weapons use the blow-forward, recoil or gas impulse from their ammunition. The Bangerter machine gun uses a blow-forward operation and is the most complex example. The Slostin machine gun uses a similar operation but with gas pistons on each barrels. The GShG-7.62 machine gun and GSh-6-23, both use a more effective, simpler gas piston drive in the centre of the barrel cluster.
  
  Section::::Models.:Minigun.
  
  Technically not a "cannon", the Minigun is more correctly classified as a rotary machine gun.
   Some oscilloscopes offer these. The user manually arms the sweep circuit (typically by a pushbutton or equivalent). "Armed" means it's ready to respond to a trigger. Once the sweep completes, it resets, and does not sweep again until re-armed. This mode, combined with an oscilloscope camera, captures single-shot events.
  
  Types of trigger include:
  
  BULLET::::- "external trigger", a pulse from an external source connected to a dedicated input on the scope.
   is called the cyclic rate. In fully automatic firearms the cyclic rate is tailored to the purpose that the gun is made to serve. Anti-aircraft machine guns often have extremely high rates of fire to maximize the probability of a hit. In infantry support weapons these rates of fire are often much lower and in some cases variable within the design of the firearm. The MG 34 is a WWII-era machine gun which today would be referred to as a general purpose machine gun. It came in several variations with a cyclic rate as high as 1200 rounds per minute, but also made an infantry model which fired at 900 rounds per minute. 
  
raw_presuppositions: Rotary barrels skew the trajectory of bullets.
raw_corrections: Bullets exit the barrel so fast that the rotation of the barrel is neglible.