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Autocannon/DBAC 2/5

Project No. 160 "K O R D" - Dual Barrel Autocannon Class.

Innovative independent line of research by young minds resulted in rediscovering once lost old Terran technology. Dual barrel Cannons were already developed in the old Terran world in around 20th century, remaining in service with various military forces through the 21st, 22nd and early 23rd century. Technology of counter flowing duel of barrels using inertia of the recoil for extraction and cocking of the opposite barrel was rendered obsolete and gradually phased out in the following two centuries.

(For reference pls. see the existing dual barrel cannon GSh-30-2. Developed in Soviet union and still in use. System is unique. Namely efficiency economy and simplicity of the design. As well as reputation of faultless operation. I am not allowed to leave link but this particular cannon is on wikipedia.)

In the years of the boom several newly established design bureaus worked on a unique idea of two barrels operating against each other. Taking advantage of recoil generated by powerful blast by cased ammunition for caliber AC 2 . Recoil seemed powerful enough that ordinary conventional system of recoil reduction resulted in massively overweight systems of existing models of autocannons. AC2, AC 5, AC 10, AC 20 and all subsequent improvements of this design prove unable to deal with the issue of excessive weight placing further strains on the chassis and gun operators. Heavy recoil of such powerful ammunition as is AC 5, AC 10 and almost impossible to control recoil of very powerful AC 20 caused that weight of those weapon systems reached unprecedented levels. Newly proposed solution to this was seemingly idea of two barrels each absorbing the recoil of the tandem sister barrel...

Several prototypes were created and by firing number of experimental cased or caseless cartridges was established that careful managed recoil absorption can be powerful enough to extract, load and prime barrel moving synchronized exact opposite direction. Further prototypes were developed and quickly pt to the test. after aprox. fifty thousand rounds put through the experimental prototype N.205. Designed and developed in Design Bureau of young designers Nikolay Mosin and Jaroslav Strnad. Supervised by none other that grand grand son of author of legendary assault rifle platform AMK 75 - Modernized variant of infantry automatic rifle platform system Korechkin. (His grand grand dad.) He, now some 75 years of age supervised already mentioned young team of Mosin/Strnad. Archibald Arkadiy Korechkin contributed by providing innovative new light weight feeding system from belt less box feeding container. Enabling continual faultless supply of ammo into a weapon capable of self destruction under its own unregulated ever increasing rate of fire !

Autocannon itself is capable of firing burst of ammo in rapid ever increasing succession. When the first barrel reaches maximum forward position. Empty case from expended cartridge is already extracted and new cartridge is ready to be inserted into the chamber at the same moment when the second barrel in the most rear position starts to move forward. Therefore the cadency/rate of fire of such weapon is strictly speaking limited only by the speed of the barrel moving forward and backward under the force of the recoil. That caused several issues with loading and extraction as well as vibrations of firing weapon. Especially when the rate of fire had tendency to grow with the increasing length of the unregulated burst. RESOLUTION. The rate of fire has to be regulated !!! Especially when experimental piece Exp.N. 33 constructed in Mitischinsky Machinostroyniy Zavod (factory) N. 23 self destructed after exceeding perceived impossible rate of fire estimated as unbelievable 2100 rounds per minute. That incident showed the potential for damage to both soft and hard targets. And simultaneously gave the team of designers choices. Fire selector was introduced into the trigger group together with massive muzzle break which is signature feature for this design.

Hence Dual Barrel Autocannon with variable burst speed DBAC 2/5. Caliber 2 and 5 was born.

Here are the Tactical Technical Data -TTD of DBAC 2/5:

                       DBAC 2
Mass 5 tons
Heat 1 per Shot
Basic Dmg 2
Regime of fire 1   2   3 (1 single shot. 2 rounds burst. 3 rounds burst.)
Fire           1   2   3 rounds of ammo.
Heat           1   2   3                      
DMG            2   4   6 
Critical Slot: 3 (Ammo slot must be located directly next to the weapon slots.)
1 ton of Ammo: 45 rounds
Range: Min/3 Short/8 Medium/16 Long/24
               DMG allocation:
Each burst hits different Mech´s location.
2(3) bursts = 2(3) Hit allocation 2D6 rolls.
(See ´Mech hit location´ table.)
               Jamm/Unjamm Rules for DBAC 2.
1. Regime of fire is declared.
2. To Hit Roll 2D6 - Upon determining Hit/Miss.
(This determines chances for malfunction.)
1 round  burst - NONE.
2 and 3 rounds burst - 2D6 Roll 2 and 3 indicates Weapon Jamms
To unjamm 2D6 Roll: Piloting skills + mod. +3 (Like RAC rule for unjamming.)  
                       DBAC 5
Mass 7 tons
Heat 1 per Shot
Basic Dmg 5
Regime of fire 1   2   3 (1 single shot. 2 rounds burst. 3 rounds burst.)
Fire           1   2   3 rounds of ammo.
Heat           1   2   3                      
DMG            5   10  15
Critical Slot: 6 (Ammo slot must be located directly next to the weapon slots.)
1 ton of Ammo: 20 rounds
Range: Min/3 Short/6 Medium/12 Long/18
               DMG allocation:
Each burst hits different Mech´s location.
2(3) bursts = 2(3) Hit allocation 2D6 rolls.
(See ´Mech hit location´ table.)
               Jamm/Unjamm Rules for DBAC 5.
1. Regime of fire is declared.
2. To Hit Roll 2D6 - Upon determining Hit/Miss. 
(This determines chances for malfunction.)
1 round  burst - NONE. 2(3) rounds burst - 2D6 Roll 2, 3 and 4 indicates Weapon Jamm.
To unjamm 2D6 Roll: Piloting skills + mod. +3 (Like RAC rule for unjamming.)  

Finally Project K O R D weapon system Mosin/Strnad/Korechin was phenomenally successful. New class of autocannons was created. DUAL BARREL AUTOCANNON. DBAC 2/5. In Short the DBAC were quickly tested by SDF - Slavic Defence Forces - Institute of Innovations and Adaptations. And DBA 2/5 was quickly recommended for fielding.

                             Project No. 225 "L A N C E" 

As soon development of DBAC 2/5 better known as Project KORD was successfully closed. Order No.225 Large Caliber DBAC development was issued.

Plan was to adapt already effective and efficient system for higher calibers. Such DBAC 10, 20 and talk was about experimental subclass of heavy autocannon cal. 15. All this effort was aimed to overcome the known weakness of magnetically and electromagnetically accelerated ammunition. Direct variant of Gauss system of kinetic projectiles acceleration/propulsion.

Work was assigned to another design bureau as the Mosin/Strnad/Korechkin was preoccupied with the finishing touches of implementation of program DBAC 2/5 now also known as Project K O R D. As project KORD was a complete success. Sadly project LANCE had issues from the very start. Vibrations, current composite alloy despite greater percentage of Titanium, Vanadium, Chromium and other rare steel additives simply was not hard yet flexible at the same time. Vibrations not only caused deformities in the frame, but also caused that the system had to be recalibrated almost after every 10th or so round sent through this increasingly unreliable weapon system. Vibration and microscopical cracks + additional ware and deformities forced to use increasingly thicker thus heavier parts. Accuracy also became an issue. As vibrations grew stronger with the caliber, so did the over all mass. Simultaneously reliability went down almost exponentially. Several weapons disintegrated after only 4000 rounds and when some staff got hurt during the net catastrophic malfunction. Bureau chief asked Academic Shipunov for assistance. Ans after aprox. three weeks over the drawing board. The combined team sent letter to the chief of the SDF Slavic Defence Force - Institute of Innovations and Adaptations. Informing that weight to caliber ration is exponentially growing. Current steel and titanium alloys are not capable to support the weight and resist the vibration caused by firing such powerful ammo. Further development of Heavy DBAC 20 and it subclass 15 is therefore suspended until metallurgy reaches sufficient level of progress and deliver alloy capable to hold to specifications and requirements unique for this type of material abuse. Hope was mutually shared when smaller caliber cartridge would be discussed.But to develop DBAC of caliber 7 or 8 is not promising any real advantage on the actual battlefield. In Summary Project LANCE was deemed unsuccessful. Due to number of technical issues unable to resolve with current level of metallurgy available.

Also mentioning that by continuing development of similar large caliber Ballistic and Kinetic Weaponry may cause delay and resources allocation issues. Severely interfering with the research for miniaturization in the field of experimental optics. In another words - Lasers.

Yours Sincerely. Academic Valeriy Shipunov, chief of Academy of Theoretical and experimental science. Stoyan Yakotych, Chief designer in Experimental Weaponry and Asymmetrical Warfare Bureau.

Fanon WikiEdit

Hey Jerry,

Not sure if you know but there is a specific BattleTech Fanon Wiki where you can create your own stuff in a place away from the canon wiki.--Dmon (talk) 13:30, 26 January 2020 (EST)

Hi Dmon, thanx for info. Truth to say I do not have clue what am I actually doing. Heck I do not even know how to properly answer your msg. May I ask you for an advice and guidance? Please? my email is JERRY1234@email.cz or can you PM me ? that is the best I can do at the moment. all the best jerry1234

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