This is CommonwealthUncommons. The goal here is to take a look and investigate some really uncommonand interesting designs from the UK and her Commonwealths. Today, it*s Canada.I*ve got some probably unheard of guns, and some vehicles that might fit theirway into a tank tree or premium vehicles.
Named after “... a little fellow who throws a small stones with great speed andaccuracy.”, the David gun was a a fairly simple idea, designed at a time whenresources were of absolute importance. Make a gun that used existing 2-pounderammunition and barrels and improve performance as much as possible.
Using common componentsfrom the 2-pounder and 6-pounder, the David gun was, in layman*s terms, a 6pounder casing necked down to accept the smaller 2-pounder projectile .Although designed as an infantry based weapon, it was intended to be mounted onany tank that could accept the 6 pounder (and some that could accept the2-pounder).
The most impressivepart of the David gun can be shown in a raw statistic- rounds would leave thebarrel at 4150 fps (SS: 1264 m/s)! Compare this to the seemingly meage 2650 fps(SS: 807 m/s) when the same ammo type was fired from the 2-Pounder Mk X. Thiswas a true hyper velocity gun, firing at over 4000 feet per second- and, withthe addition of the Littlejohn adapter and the Mk 1 Littlejohn ammo, thatnumber increased to 5058 fps (1550 m/s)!
The gun managed topenetrate with the 149mm armor penetration while using the APCR ammo duringpoint blank test fires on flat armor. No penetration performance of the shotwith the Littlejohn was recorded (at least none that I could fine) but onecould postulate a bit and ballpark the number at in the 170-180mm range, ofcourse, this was at very short ranges.
Much like the David Gun, the Canuck gun was requested at a time when guns wereat an absolute premium. The Commonwealth in its entirety was scrambling to finda replacement for the 6 pounder in order to keep up with German development,and several projects were started concurrently, such as the 8-pounder,12-pounder, 75mm Vickers and 17 Pounder Projects. The Canadian contribution wasthe so-called “Canuck Gun”
The gun was effectively alengthened 6-pounder, stretched out from the earlier L/43 and L/50, to the L/63length. Tests with the weapon showed a muzzle velocity of from 990 m/s withAPCBC. Compare this with average of 792 m/s and 831 m/s for the L/43 and L/50guns. Firing APCR the recorded penetration was 130mm at 30 degrees comparedwith the 100mm penetration of a L/43 shooting APCR with both shots at 400 yard.
Although the weaponwas seen as an improvement and a success it was abandoned, as existing6-pounder designs, firing the more advanced APDS ammo could achieve similarperformance. I don*t believe the weapon was ever tested for performance withAPDS rounds. Although oddly enough the weapon was used as a testbed to testmuzzle breaks for later marks of 6-pounders, firing APDS with high pressurecasings (performance of that was never recorded as the weapon as a project wasabandoned by that point.)
In World of Tanks, we get 105 and 110 with silver, 170 and 180mm with *gold* round penetration (on the L/43 and L/50 respectively). I*d imagine the Canuck gun might be able to achieve 140mm and 200mm “gold” penetration, using ballpark figures. Wargaming*s penetration figures are a little wonky on the 6-pounders (they*re using APCBC for “AP” and using APDS figures for “APCR”) but at least we wouldn*t be consistently wrong.
The Canuck was onlyslightly more heavy than the existing 6-pounder and as such could feasibly bemounted in just about any tank that uses a 6-pounder. It was also planned totest it in mountings in a number of tanks, supposedly it was predicted that itcould be used to engage German Tigers and Panthers. The M10 or M4 tank or a SPGmounting on a Bren Carrier or Loyd Carrier were a few examples ofconsiderations. I would particularly enjoy a RAMII in the tank tree with such aweapon.
6 PounderSP – Airborne
In April 1943 plans were drawn up for a light-weight, low profile tracked 6pounder to take either the 6-pounder or the QF Mk V 75mm (a bored out6-pounder).
It was based off auniversal carrier with one less roadwheel per side, powered by a 60 hp Jeepengine with the Jeep gearbox. It would have a crew of two and carry 70 roundsof ammunition. Total length would be no longer than 4.6m, with 1.3m high, withatop speed of 64 kmph, a gun traverse of 15 degrees in either direction,elevation of 20, depression of -7.
It was designed forairborne type operations, but due to the fact that even with its tiny size itfailed to fit inside the Horsa gliders, it wasn*t adopted. It was however, anextremely tiny tank!
The artillery users*committee considered its use as a replacement for a standard 6 pounder but thiswas seen as unfeasible, as the 2 man crew would severely limit the gun*s rateof fire (a second carrier was suggested to carry the remainder of the crew andammo). This would be suitable as a low-tier TD.
During 1942, there was a concern within the Canadian military about thesupposed shortage of proper, effective armored vehicles, which were able toengage the rapidly improving german armor. Canadian Lt. General McNaughton madea request to mate the 25 Pounder Ram SP (later called the Sexton) with a 17Pounder.
The concept was asound one, early 17-pounders were actually built into existing 25-poundercarriages, without much modification to their recoil mechanisms- so why notsimply mount it on a tank that had the same mountings?
It wasn*t long before a prototype wasmocked up, and it turned out that the 17 Pounder was a little difficult tomount than previously expected. Once mounted correctly, the gun stuck out a bittoo far from the front of the vehicle, exposing important mechanical parts topotential damage. The long gun and huge breech and recoil length kept the guns*traverse quite limited and required some significant changing of the internalcrew layout of the Sexton.
There was also a plan to mount the 3.7inch Anti-Aircraft gun (it had a superior HE round and supposedly slightlysuperior armour penetration at all distances) and it was claimed the two gunswould be “interchangeable” with very little effort. According to documents itwas less difficult to mount the 3.7 inch gun than the 17, the gun was shorterand allowed overall greater traverse. Mountings for the British pattern 3inAnti-Aircraft gun were planned as well, if weapons such as the 3.7 or17-pounder could not be procured.
2014-08-10 15:52 来源：其他 责任编辑：lvfeng