Yak-9U / Yak-9UT Performance

[Laurelix]

Yak-9U / Yak-9UT

• General Data
Empty Weight: 2512kg
Loaded Weight: 3205kg
Wing Area: 17.15m2
Engine: VK-107A
Take Off: 1650hp / 1550hp at 1200m / 1450hp at 3800m

• Max Speed:
- Normal Power:
575km/h at Sea Level - (1500hp)
672km/h at 5000m

- War Emergency Power:
594km/h at Sea Level - (1650hp)
694km/h at 5000m

(During One test - 700km/h at 5600m at WEP)

• Rate of Climb: (Normal Power)
Time to 5000m: 5:00

• Sustained Turn Time
At Normal Power - 19 seconds
At War Emergency Power - 18 seconds

• Firepower
- Yak-9U
1x 20mm ShVAK (120 rounds total)
2x 12.7mm Berezin UB (340 rounds total)

- Yak-9UT
Option 1: 1x 23mm NS-23 (80 rounds total) + 2x 20mm B-20S (240 rounds total)

Option 2: 1x 37mm N-37 (28 rounds total) + 2x 20mm B-20S (240 rounds total)

Option 3: 1x 45mm NS-45 (29 rounds total) + 1x 20mm B-20S (120 rounds total)

Note:
1. Sustained Turn Time is at 1000m, 360 horizontal turn, No Flaps
2. Yak-9UT with more firepower will have slight decrease in Top Speed and Rate of Climb compared to the Yak-9U

 

[Elvis]

Climb rate converts to 3280.84 ft./min....not too shabby!
Love this plane. Agile, light, compact, powerful...it had it all.
It even looks tough.
Best fighter of all?

 

[Ivan1GFP]

• Firepower

- Yak-9UT

Option 3: 1x 45mm NS-45 (29 rounds total) + 2x 20mm B-20S (240 rounds total)

Hello Laurelix,

The NS-45 armed Yak fighters would only have had a single cowl gun. The ammunition feed for the big cannon took up the room that would have been needed for the other cowl gun. See attached photograph for what things look like under the hood for the Yak-9T with NS-37 and a single ShVAK 20 mm.

Hello Elvis,

Your painting is most likely a Yak-3. I believe this would be the original aircraft in a French Aviation Museum.

- Ivan.

 

[Laurelix]

Hello Laurelix,

The NS-45 armed Yak fighters would only have had a single cowl gun. The ammunition feed for the big cannon took up the room that would have been needed for the other cowl gun. See attached photograph for what things look like under the hood for the Yak-9T with NS-37 and a single ShVAK 20 mm.View attachment 555503

Hello Elvis,

Your painting is most likely a Yak-3. I believe this would be the original aircraft in a French Aviation Museum.

View attachment 555504

- Ivan.

You're right, well spotted

 

[Elvis]

Apologies Ivan, I was just trying to put a little "imagery" to the text.
How about this?....

...from the GoAviator website. Says its a Yak-9.

 

[Ivan1GFP]

Hello Elvis,

The problem with all the current flying "Yak fighters" as I understand it is that they are all based on the Yak-11 "Moose" Trainer which was based on the Yak-3. I believe they all are flying with Allison engines these days.

- Ivan.

 

[Elvis]

Wasn't the Yak-11 a radial powered airplane?

 

[Ivan1GFP]

Hello Elvis,

Yes, that is the one. With such an engine and cockpit change it is hard to see its ancestry, but it is there.

Also worth noting is that for the Yak fighters with the M-107 / VK-107 engines, they tend to have their carb intake on the top of the cowling. They CAN be found about halfway between cockpit and propeller, but more often the scoop is closer to the propeller at least in photographs I have seen. I do NOT stand by this conclusion because it is just photographs I have seen and may not represent the numbers actually produced.

I have attached a couple photographs for comparison.
I guess what the profile photographs really show is that they are pretty hard to tell apart from the side which isn't surprising because the lengths are almost exactly the same.
The Wings of Yak-3 are considerably smaller though.

- Ivan.

This is the Yak-3 with a Shvetsov M-82 Radial engine. Looks pretty much like a Yak-11 but much more power.

This is a Yak-3 with a Klimov M-105 engine. Note the clean upper cowl.
There are a couple bumps where the cowl guns are located though.

This is the Yak-3 with a Klimov M-107 engine. Note the scoop behind the propeller. Note there are still the gun bulges about mid way along the upper cowl.

This is the Yak-9 with Klimov M-107 engine. Note the carb scoop. Not very different in appearance in comparison to the Yak-3 with the M-107.