I am really confused here about which planes get which armament options and why? Maybe someone else can enlighten me, or Pyro will answer.
One thing I really love about this game is the ability to configure your own loadouts, and most particularly since I am a fighter dweeb, pick which guns you want for the job.
But why do some planes get the option of different loadouts and others don't??
Let me explain.
For the Spitfire variants, the British didn't change the aircraft designation (but did have a different "wing" designation) and some had x2 20mm and x4 .303's, and others had x2 20mm and x2 .50's. We get both options in the game.
The American F4U actually added a different designation (-1c and -1d) for what amount to only an armament change, and we had to wait for each variant. But conversely the P-51 had the standard armament of 6 guns, but some units did a field modification to 4 guns and we get both options.
The Germans planes seem to come out really good in this area (rejoice Luftwobbles!!

). Not only do they get Rustsatze (Field Conversion Kits) they get Factory Conversion Kits (Umrust-Bausatze designated with a "U") that are similar to the Rustsatze, but it just means they were added at the factory. For instance the Bf109G10 with the added 20mm gun pods is the Bf109G10/R6. The Fw190A8 with the x2 30mm cannons is the Fw190A8/R8. If you then add the Wgr21cm rockets, it becomes the Fw190A8/R6/R8.
So now we come down to the latest aircraft release.
The Yak-9U had a standard armament of x2 12.7mm MG's and a single 20mm cannon, which is the only armament option in Aces High. However some Yak-9U's were armed differently. In these aircraft the x2 12.7MG's were replaced with x2 20mm B-20 cannons, and the single 20mm cannon could be replaced with a different 20mm cannon, a 23mm NS23 cannon, a 37mm NS37 cannon, or even a 45mm NS45 cannon.
This plane was known as the Yak-9UT.
There were appreciable number of these aircraft built (almost 300 out of around 3,000), and they participated very successfully in the war.
So why didn't we get these armament options on this aircraft??
How is a Yak-9UT any different to a Yak-9U, than a Bf109G10/R6 different to a BF109G10? Or how is it any different than the Fw190A8/R6/R8, or the field conversion of a P-51 ?? They are all subvariants of the main variant of the aircraft in the game, ie different armament options.
And don't throw out the predictabel "playbalance" arguement (or at least expect me to buy it

). If a Bf109G10/R6 (x3 20mm) isn't unbalancing, then a x3 20mm Yak-9U isn't unbalancing.
If we have a consistent policy (ie a fair policy) on gun options from country to country, then I personally think the Yak should get its cannon options.
I would be really interested to know what the "policy" actually is, and how it works from aircraft to aircraft, since it doesn't seem very consistent or fair.
PS: Before you jump in to disagree or flame me, think about what this means to future aircraft additions (ie your own personal favorite). For instance is the F6F HellCat going to get its x2 20mm + x4 .50's option, in addition to the standard x6 .50's ??
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**MOL**, Men of Leisure
"Real Men fly Radials, Nancy Boys fly Spitfires"