Originally posted by Fruda
...Very few of them actually existed. There were several common field mods that added gun pods to the wings, though.
Was there, by any chance, a version with a Yak style armament, like one or two UBS and an ShVAK?
"Quite the contrary, actually. If whitepaper and first-hand pilot accounts are anything to go by, it was wonderful at altitude and flat-out whipped the Bf-109F, its contemporary (which isn't a slouch at altitude).
I'm sure it would eat a Lavochkin above 10,500 feet, as the La-Las begin to suck horribly up there. Yaks aren't so great above 12,500 feet, as they don't have much wing surface, stalling more easily than aircraft that are built for high altitude roles. The Yak-9U might get its top speed at around 17,000 feet, but it definitely isn't dominant. First, it takes a very long time for it to reach said top speed in level flight, and is completely worthless unless you're flying a long distance (even then, you'll likely be intercepted). Second, it stalls pretty easily up there, and it definitely doesn't retain energy well at all.
The MiG-3 would probably have a beautiful time diving on a Yak from 23,000 feet"
So, this would be, essentially, an EW BnZ/High alt fighter? How was the endurance?