I have a quesiton regarding 12.7mm Russian UBS.
I just got the book about Single engine russian fighters aswell as the one about multi engine planes.
They're called "Soviet Combat Aircraft of the Second World War Volume one: Single-Engined fighters" and "Soviet Combat Aircraft of the Second World War Volume two: Twin-engined Fighters, Attack Aircraft and bombers"
Authors are
Yefim Gordon and Dmitri Khazanov with Alexander MedvedHere's a snip from the foreword....
Until now, books on Soviet aircraft of the era have relied very much on Western sources and have been lightweight on first-hand information, especially on design origins, production, flight testing and combat experience.
In researching Soviet Combat Aircraft of the Second World War the authors have trawled rich resources of Russian origin, including manufactures, flight test establishments and Soviet air force and naval aviation operational records.
This has produced a wealth of new material, much of which re-writes previously held Western views and at last presents a detailed and authoritative study of this fascinating subject.
Haven't had the chance to read all too much in any of the two volumes yet, what I have read is very impressive though and they make comparisons with some other aircraft aswell.
In the beginning of the two volumes they discuss some armament, and make some comparisons, mostly with the 30 cal Browning, 50 cal Browning and the ShVAK and Brittish Hispano. They also compare the the 7.62mm ShKAS and later Lightweight Ultra ShKAS with the Browning 30 cal. (leightweight Ultra ShKAS had a rate of fire of 2,700 rounds per minute!!)
Ok, here's a snip from that.
To provide an intermediate calibre, the Beresin came into use in 1940. M Ye Beresin quickly developed it as a the UBS for synchronized installations, the UBK for wing mounting and also the UBT for bomber turrets. Though it had the same 12.7mm calibre as the '50-calibre' Browning, it weighed only 47lb (21.4kg) compared with 64lb (29kg), and yet fired projectiles weighing 1.7 ounces (48g) at the rate of 1050 rounds per minute with a muzzle velocity of 2,789 ft/sec (850m/sec), compared with the Brownings 1.1 ounces (33g) projectiles fired at 750 rounds per minute with a muzzle velocity of 2,749ft/sec (838M7sec)
They also say that the ShVAK had about the same Velocity and fired at a rate of 800 rpm. Rounds were smaller and lighter though.
The question I have, the UBS in AH, fire at a rate of about 870 rounds per minute, behing 70 rounds more then the Chart FDutchman posted in my "Mg151 Vs Hispano" thread but being about 200 rounds per minute slower then the information posted in this book. The authors have apparently done some digging in Russian archives and are most likely correct on it.
Finally, to the Question, is the slower RPM in AH (872 rpm) because they are synchronized thus lowering the rate of fire (1050 being 'clean' rate of fire) or is it that HTC has used other sources (meaning Western sources) where the rate of fire has been stated as lower?
Btw, Pyro, when the
Yak 3 is added to AH, I might convert to VVS and you'll stop hearing my questioning of the LW

*HINT HINT*
The book also say some interesting stuff about the ShVAK, something I didn't know was that the round was lighter, less explosives in it but had about the same velocity, nice to know when I pick up the Yak 9 next time, knowing that it will have the same trajectory as a Hispano!

Any answer much appriciated
