What ever happened to Yak-9M?

[Kweassa]

The late version is powered by a VK-105PF 1260 HP for about 2100kg far from being underpowered

 I think you mean the Klimov VK-107A with 1650hp. The VK-107A is the engine used on the Yak-9U. This is the engine originally planned for the Yak-3, but production problems limited it to the VK-105PF with 1260hp for the first production batches. Later, the engine was changed to slighly upgraded VK-105PF-2(1300hp).

 

Yak3 was very manuverable, but underpowered, thus it would probably be a spitv clone. Able to out turn, but not chase anything.

 The Yak-3 was anything but an underpowered plane. The standard Yak-3 with the VK-105PF-2 is quoted with a top speed of 407mph and 4,400fpm initial climb rate with only 1300hp. IIRC the fastest WW2 Yak was the Yak-9U, but the low alt speed of the Yak-3 was faster than the Yak-9U.

 The Yak-3 with the VK-107A, which unfortunately never saw service in WW2 is quoted at 446mph top speed with 5,100fpm initial climb rate. This is with an engine that produces an output at the same levels of the Merlin engines used in the Spit9 and the P-51.

 The Yak-3 was developed from the "light Yak" line started from the single-seated Yak-1s, and is quite a bit lighter than the Yak-9U of the "heavy Yaks" which started out from the two-seat trainer Yak-7UTI(and ultimately developed into the Yak-9 groups).

 It'd be faster than the Yak-9U at deck alts, more maneuverable, and would also accelerate better. It'd be something like a bit slow La-7 that maneuvers a lot better.

[Kweassa]

Which reminds me..

 the AH1 Yak-9U charts show its top speed at about 415~420mph or so. IIRC the Yak-9U wih the VK-107A did about 430~435mph.

 Is our AH Yak-9U using a VK-105PF-2?? Or is it just using the "modest" figures rather than the "exaggerated" ones?

[straffo]

Originally posted by Kweassa
I think you mean the Klimov VK-107A with 1650hp. The VK-107A is the engine used on the Yak-9U. This is the engine originally planned for the Yak-3, but production problems limited it to the VK-105PF with 1260hp for the first production batches. Later, the engine was changed to slighly upgraded VK-105PF-2(1300hp).

It has never be very clear if the Yak1M were Yak3 or not and the Yak1M/Yak3 had a VK105PA rating about 1100 HP next the  VK-105PF/PF2 and starting august 1944 some got the VK-107A

But don't quote me on the VK107A ... I don't know really know if it was deployed in the VVS but some book pretend it was the case .



I think it's the modest performance which are modelled in AH.
Search a fort Vermillion's post in this forum.

[Kweassa]

It has never be very clear if the Yak1M were Yak3 or not

 I think it has to do with the attitude of the VVS in comparison with other airforces which loved to designate and document things.

 I'm no expert on the history of the Yaks, but the impression I get is that the VVS never really cared to designate things in smooth and reasonable order. If it was a "Yak-1", then be it (technically) a Yak-1M or a Yak-1B or whatever modifications it had that differed from the original Yak-1, they just called it "Yak-1" on the papers.

 For example, the late Yak-1s of the frontlines which received some very heavy modifications including different looking cowls, and a custom installed bubble top canopy, and etc etc.. which essentially is under the same standards where the later-introduced Yak-1B is at, they still just called it "Yak-1".. No matter what the heck the pilots do to it, or how much such modifications have become common practice and "standardized".. if it's a "Yak-1" then it's a "Yak-1" !!

 Kinda strange to see it in that perspective, whereas other countries rigorously tried to name each sub-types and variants. Heck, the USAAF designated different numbers and letters according to which factories their planes were produced from, and the Luftwaffe slapped on numbers for all of the different Rustsatz and Umrustsatz kits. If it were the VVS, it'd be all just "P-47", "P-51", and "Bf109"!

[Tilt]

I do not know of a Yak1 S but many  books refer to plural yak1 as Yak 1s.

The 1943 Yak1M was a prototype......... two of them were made and they formed the basis of the future light weight 1944 Yak3 and a lot of lessons learnt were added to the late 44 Yak9U.

There was also an abondoned 1941 1-30 prototype also momentarliy called the Yak 3

It goes like this

Yakovlev begat the I-26,

I-26 begat the Yak1, and the UTI- 26 trainer.

The Yak1 begat the Yak1M.

The Yak1M begat the Yak 3.

The UTI-26 begat the Yak7, Yak 7A, Yak7B, Yak7M, Yak7R, Yak7D

The Yak7D begat the Yak9

The Yak9 begat the Yak9D, Yak9DD, Yak9T, Yak9B, Yak9M

The Yak9D and the Yak1M begat the Yak9U.

The Yak9U begat the Yak9P.

[Mitsu]

MiG MiG MiG MiG MiG MiG.....

[GScholz]

The prototype Yak-1M's flew in 1942. Preproduction Yak-3's (still designated Yak-1M) saw action in the battle of Kursk in July 1943. Mass production didn't start before 1944.

[Wotan]

The Yak-1M and the Yak-1M that became the Yak-3 are different. In the west the Yak-1 with a "bubble canopy" is referred to as a Yak-1M. The soviets didnt refer to this a Yak-1M and considered it a Yak-1. The one that became a Yak-3 was just being experiemented with through out late 43 into 44 and very few were made.

It's a confusion in designations.

While the The Yak-3 was certainly further development of the Yak-1M it didnt get into squadrons until July '44.

The common designations for Yak-1 fighters used by most Western sources are erroneous in several significant respects. The biggest error is the use of the 1M designation for the "bubble canopy" version of the Yak-1. In actuality, the -1M was an experimental prototype used in the Yak-3 development program, and only a few were built. What most everyone calls a Yak-1M was not really given a separate designation at the time. It was just another Yak-1, and these came in several distinguishable versions themselves. For the sake of postwar discussions, these have come to be known as the Yak-1b, but I think that is only an after-the-fact designation, as indeed so many designations are for Soviet wartime aircraft. During the war the Russians themselves seldom bothered with the same sort of elaborate designations and sub-designations that the other combatants used, other than to sometimes designate major engine changes".

[straffo]

Originally posted by Tilt
There was also an abondoned 1941 1-30 prototype also momentarliy called the Yak 3
 

When refering of the 2 yak3 I was thinking of this one

@Kweassa to add to the confusion the Russian had different plant producing the "same" but a bit "different" airplanes