Yak-9P with VK-105PF-2 engine

[Wurger]

This is absolutely false.

The VK-105 is 2,027 mm long, the VK-107 2,166 mm (+139 mm or 5 3/8").

The weight is 580 kg compared to 769 kg for the VK-107.

See the manuals for these two engines:

Manuals for various Russian and Lend-Lease engines

Manuals for : - Mikulin M-17F, 1937 M-34RNA, RNB and NB, 1936 AM-38 and AM-38F, 1944 AM-42, 1945 [2 versions: complete and brief manuals] - Kilmov M-100, 1936 M-100A, 1939 M-100, M-100A, M-103 (2 parts), 1938 12Y-31, M-103A and M-105 (finnish, 2 parts), 1943 M-105PA, RA, PF and RF, 1944...

ww2aircraft.net

Below is a scale drawing of both.

And it is just what I meant.

 

[Hoggardhigh]

This is absolutely false.

The VK-105 is 2,027 mm long, the VK-107 2,166 mm (+139 mm or 5 3/8").

The weight is 580 kg compared to 769 kg for the VK-107.

See the manuals for these two engines:

Manuals for various Russian and Lend-Lease engines

Manuals for : - Mikulin M-17F, 1937 M-34RNA, RNB and NB, 1936 AM-38 and AM-38F, 1944 AM-42, 1945 [2 versions: complete and brief manuals] - Kilmov M-100, 1936 M-100A, 1939 M-100, M-100A, M-103 (2 parts), 1938 12Y-31, M-103A and M-105 (finnish, 2 parts), 1943 M-105PA, RA, PF and RF, 1944...

ww2aircraft.net

Below is a scale drawing of both.

Wurger suspects in posts #16 and #18 that the Yak-9's fuselage was slightly extended to accommodate the -107 engine.

What are your or anyone else's thoughts on the matter?

 

[Bretoal2]

Wurger suspects in posts #16 and #18 that the Yak-9's fuselage was slightly extended to accommodate the -107 engine.

What are your or anyone else's thoughts on the matter?

According to the Wikipedia/Ukraine entry for the Yak 9,

Як-9 — Вікіпедія

uk.wikipedia.org

The fuselage of the 9K and 9T versions with the VK-105 PF engine was five to eleven centimeters LONGER than the Yak 9U with VK 107 engine (860 or 866 cm versus 855).

This seems perfectly logical, as maintaining the center of gravity with an engine 200 kg heavier in the nose, the only option was to move it BACKWARD.

 

[Hoggardhigh]

The fuselage of the 9K and 9T versions with the VK-105 PF engine was five to eleven centimeters LONGER than the Yak 9U with VK 107 engine (860 or 866 cm versus 855).

I suspect this is because the 9K and 9T have heavier nose cannon, whose barrel noticeably protrudes from the spinner, hence the longer fuselage length?