The LaGG-3 was essentially the series production version
of the LaGG-1 with a revised outer wing incorporating
fuel tanks, and an armament of one 20mm and
two 7.62mm weapons. Fixed wing slats - later replaced
by automatic slats - were introduced and
balance weights were added on the elevators and rudder,
but were later discarded in favour of statically and
dynamically balanced surfaces. Weight was reduced as
a result of a structural analysis. LaGG-3 deliveries commenced in the spring of 1941, initially with the M-105P
engine, but, from late in the year, with the M-105PF
affording 1260hp at 800m. Provision was
later made to replace one or both machine guns by
weapons of 12.7mm calibre, the 20mm hub-mounted
cannon being replaced by one of 23mm calibre in some cases, and a pair of 12.7mm underwing guns was
sometimes fitted. Three aircraft were each fitted with a
37mm cannon and referred to as LaGG-3K-37s, and
one example was fitted with the 1650hp Klimov
M-107A engine. Production of the LaGG-3 was completed
in the late summer of 1942 with a total of 6,528
| Take-off weight||3190 kg||7033 lb|
| Empty weight||2620 kg||5776 lb|
| Wingspan||9.8 m||32 ft 2 in|
| Length||8.9 m||29 ft 2 in|
| Wing area||17.5 m2||188.37 sq ft|
| Max. speed||570 km/h||354 mph|
| Cruise speed||450 km/h||280 mph|
| Ceiling||9700 m||31800 ft|
| Range||800 km||497 miles|
|A three-view drawing (1670 x 1230)|
Does anyone know the speed of the yak-9m with the vk105pf-2 engine? I've looked all over.
Aaron, I think the series -66 was the late model LaGG-3 you refer to prior to the radial LaG-5. Am I wrong?
At first sight your -37 reminds me of the 37mm hub cannon armed LaGG-3 but then you mention the standard guns.
What am I missing? Could you please expand on that a little for us?
Certainly it was better against bombers and ground attack than tackle enemy fighters since it was typically no stall fighter before the weight was trimmed. It had a tendency to spin out till then. Many crash landings were due to stalling on the approach. Nice to see it finally develop into a halfway competent dog-fighter in the end of it's run.
In fact early LaG-5 pilots wanted their LaGG-3-66 back!
But Lavochkin persevered with a more powerful radial and other refinements until it outperformed the -66, then the latest Fw 190 and Bf 109 too! In fact some would say the La-7 was finally better than even a Yak.
I'm not going to go into detail on each of the many variants of this type. For the most part the LaGG-3 was underpowered/overweight and sluggish by VVS standards and compaired to other USSR fighters. It dove well and was very rugged like the P-40. But, in April 1943 a lightened and improved model was approved for production after its fist flight. The LaGG-3-37 when flown by Yuri Shipov in front of the VVS proved that it was capable of turning with a Yak-9D and outclimb it. In service it proved to be more than a match for any Bf.109 it met in combat and had no difficulties in encountering the Fw.190 in 1944. The number of this type was relitively small because production was terminated in autumn of 1943 in favor of the La-5.
The following performance is typical for the LaGG-3-37:
M-105PF: 1,260hp WE. 1xUBS (12.7mm). 806m/s 1,000rpm. Bullet weight: 40g. Penetration: 20mm @ 350m.
1xShVAK (20mm). 800m/s. 800rpm. Bullet weight: 96g. Penetration: 25mm /150m. 15mm /300m.
Max.Speed: 339mph/SL. 372mph/12,497ft. Climb: 3,680fpm/SL. 16,400ft/5.1min. Ceiling: 35,960ft.
The M-105PF powered LaGG-3 toward the end of 1941 could do negative 'g' dives (Ditto for the Yak).
Beware the VYa-23. It could penetrate most any armor in the air! The ShVAK 20mm was certainly faster but was light by world standards for the caliber. The VYa was like two 20mm cannon. The Volkov-Yartsev-23mm fired a 200g projectile containing 10g of HE or penetrate 1 inch armor at 400m (1,300') with AP rounds. It's muzzle velocity was 905mps!! It made the IL-2 famous. Rate of fire ranged from 370-600rpm.
Salvo of fire = 2.88kg/sec. (2 ShKAS, 2 UBS +1 UB)early.
= 2.00-2.72kg/sec. (1 UBS +1 ShVAK or VYa-23).
Climb to 5km = 6.8-8.5 min.
360 turn = 20-26 sec.
Do you have any comments about this aircraft ?