LaGG-3 Performance & Test Flight Results

Laurelix · Jul 7, 2024

Does anyone have the test flight results data on these aircraft?

LaGG-3 Series 8
LaGG-3 Series 11-23
LaGG-3 Series 29-35
LaGG-3 Series 66

Also pls include the engine they had

What I was able to gather:

I-301 (VK-105P)
538km/h at Sea Level
605km/h at 5000m

LaGG-3-1 (VK-105P)
468km/h at Sea Level
535km/h at 5000m

LaGG-3-8 (VK-105PA)
486km/h at Sea Level
549km/h at 5000m

LaGG-3-23 (VK-105PA)
490km/h at Sea Level
552km/h at 5000m

LaGG-3-35 (VK-105PF)
498km/h at Sea Level
565km/h at 4000m

LaGG-3-66 (VK-105PF)
524km/h at Sea Level
591km/h at 4000m

bf109xxl · Jul 7, 2024

Laurelix said:
Does anyone have the test flight results data on these aircraft?

LaGG-3 Series 8
LaGG-3 Series 11-23
LaGG-3 Series 29-35
LaGG-3 Series 66

Also pls include the engine they had

What I was able to gather:

I-301 (VK-105P)
538km/h at Sea Level
605km/h at 5000m

I-301 (VK-105P)
515km/h at Sea Level
605km/h at 4950m

Laurelix said:
LaGG-3-1 (VK-105P)
468km/h at Sea Level
535km/h at 5000m

LaGG-3-7 (VK-105P) - No.3121715, GAZ 21
474km/h at Sea Level
549km/h at 5000m

Laurelix said:
LaGG-3-8 (VK-105PA)
486km/h at Sea Level
549km/h at 5000m

LaGG-3-8 (VK-105P) No.3121855 GAZ 21
462km/h at Sea Level
544km/h at 4850m

Laurelix said:
LaGG-3-23 (VK-105PA)
490km/h at Sea Level
552km/h at 5000m

LaGG-3-29 (VK-105PF) No.31212912 GAZ 21
507km/h at Sea Level
566km/h at 3850m

Laurelix said:
LaGG-3-35 (VK-105PF)
498km/h at Sea Level
565km/h at 4000m

LaGG-3-60 (VK-105PF) No.6011 GAZ 31
545km/h at Sea Level
595km/h at 3400m

Laurelix said:
LaGG-3-66 (VK-105PF)
524km/h at Sea Level
591km/h at 4000m

LaGG-3-66 (VK-105PF) No.7166 GAZ 31
532km/h at Sea Level
586km/h at 3600m
Source (some test reports are available):

Laurelix · Jul 7, 2024

bf109xxl said:
I-301 (VK-105P)
515km/h at Sea Level
605km/h at 4950m

LaGG-3-7 (VK-105P) - No.3121715, GAZ 21
474km/h at Sea Level
549km/h at 5000m

LaGG-3-8 (VK-105P) No.3121855 GAZ 21
462km/h at Sea Level
544km/h at 4850m

LaGG-3-29 (VK-105PF) No.31212912 GAZ 21
507km/h at Sea Level
566km/h at 3850m

LaGG-3-60 (VK-105PF) No.6011 GAZ 31
545km/h at Sea Level
595km/h at 3400m

LaGG-3-66 (VK-105PF) No.7166 GAZ 31
532km/h at Sea Level
586km/h at 3600m
Source (some test reports are available):
View attachment 787416
View attachment 787420

Id like to point out that VK-105P & VK-105PA
Both have 1.2ata and 1.25 ata power regimes

474km/h at Sea Level - 1020hp (1.2ata)
486km/h at Sea Level - 1100hp (1.25 ata, 5 min)
549km/h at 5000m
(549 - 474 = 75 , 549 - 486 = 63)

I-301
605 - 515 = 90 which means the 515 at SL is at 1.2ata (1020hp) regime

VK-105PF have same engine power curve so technically top speed should be achieved identically around 3800-4000m
Afterall even the Yak-9/Yak-9T/Yak-9K have the same engine and achieve their top speed at those altitudes

LaGG-3-29 has 507km/h at SL with 1210hp
1210 / 1020 = 1.863
Cube Rooted = 1.0586
507 / 1.0586 = 479km/h with 1020hp at SL
491km/h at SL with 1100hp at SL

Laurelix · Jul 8, 2024

Here is one of Gaijin's datasheets for LaGG-3 which has its speed calculated based on the power curve of the engine at different altitudes.

467km/h at Sea Level
555km/h at 4800m
Is what was calculated

Although the WEP multiplier they used seems off
1100 / 1020 = 1.07843
Cube Rooted = 1.02549
467 x 1.02549 = 479km/h at SL

467km/h at SL - 1020hp
479km/h at SL - 1100hp
555km/h at 4800m

I'm guessing it's based on this
462km/h at Sea Level
554km/h at 4850m

Laurelix · Jul 8, 2024

It starting to look more like this now

LaGG-3-7 (VK-105P) - No.3121715, GAZ 21
462km/h at Sea Level — 1020hp
474km/h at Sea Level — 1100hp
549km/h at 5000m

LaGG-3-8 (VK-105P) No.3121855 GAZ 21
462km/h at Sea Level — 1020hp
474km/h at Sea Level — 1100hp
544km/h at 4850m

549 - 462 = 87
(549 at 5km, 462 at SL)

I-301
605 - 87 = 518 (At SL)
(At 5km)

I-301
518km/h at Sea Level - 1020hp
531km/h at Sea Level - 1100hp
605km/h at 5000m

bf109xxl · Jul 8, 2024

The LaGG-3 did not have WEP, only take-off mode, and the pilot's manual explicitly states that take-off mode should be switched off immediately after take-off. There was no mention of switching on the take-off mode to achieve maximum speed. Thus, all calculations of the maximum speed of the LaGG-3 on WEP are meaningless.

Laurelix · Jul 8, 2024

bf109xxl said:
The LaGG-3 did not have WEP, only take-off mode, and the pilot's manual explicitly states that take-off mode should be switched off immediately after take-off. There was no mention of switching on the take-off mode to achieve maximum speed. Thus, all calculations of the maximum speed of the LaGG-3 on WEP are meaningless.

You say that but

LaGG-3-7 (VK-105P) - No.3121715, GAZ 21
474km/h at Sea Level
549km/h at 5000m

This sea level top speed is achieved at Take off power

We even have an example of having 554km/h max speed but only with around ~460km/h at sea level

bf109xxl · Jul 8, 2024

Laurelix said:
This sea level top speed is achieved at Take off power

A citation from the report would be appreciated.

Laurelix said:
We even have an example of having 554km/h max speed but only with around ~460km/h at sea level

The differences in max.speed can be explained by other factors (according to reports).

LaGG-3 Performance & Test Flight Results

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