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La-5F No.99391160: June 1943: M-82F: 3,202 kg.
561 / S. L.
619 / 5,790 m.
with 1700 horsepower, already achieved 561 at SL
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La-5F No.99391160: June 1943: M-82F: 3,202 kg.These are approximate data for the La-7 of the head series, tested in July 1944. The prototype La-5FN ("dooblyor") had a ground speed of 562 km/h in nominal mode and 595 km/h in emergency mode, with a maximum speed of 648 km/h.
La-5FN produced in May 1943 (#39210104) had a ground speed of 530 km/h in nominal mode and a maximum speed of 610 km/h, in October 1943 La-5FN (#39210495) had a ground speed of 542 km/h in nominal mode and a maximum speed of 620 km/h. The graphs in this book are very rough, they cannot be used to accurately determine the maximum speed of Soviet airplanes, which varied greatly during production.
May I know the source of this information?La-5F No.99391160: June 1943: M-82F: 3,202 kg.
I provided control test results that were obtained for production airplanes. The difference between M-82F and FN(V) by power at the beginning of the FNV production was rather insignificant.561 / S. L.
619 / 5,790 m.
with 1700 horsepower, already achieved 561 at SL
542 at nominal 1570hp translates to 572km/h with 1850hpMay I know the source of this information?
I provided control test results that were obtained for production airplanes. The difference between M-82F and FN(V) by power at the beginning of the FNV production was rather insignificant.
And what? The FN prototype had 562 at nominal and 595 at TO.542 at nominal 1570hp translates to 572km/h with 1850hp
546 nomial translates to 576 with 1850hp at the deckAnd what? The FN prototype had 562 at nominal and 595 at TO.
The maximum speed of serial La-5FNs according to control tests of the Air Force Research Institute did not exceed 626 km/h, and the ground speed at nominal was 546 km/h (tests in January 1944).
The maximum speed of serial La-7s never exceeded 658 km/h during control tests.
In addition: La-5FN production amounted to about 3% of the total fighter production in the USSR in 1943.
546 nomial translates to 576 with 1850hp at the deck
the graph shows
574-577 at SL
635-638 at 6250m
theres the other graph which has lower deck speedView attachment 832541
The graph overestimates the speed by 8-17 km/h (at least).
You can simply shift this graph to the left by ~17-20 kph and you obtain very realistic values for serial La-5FNs in 1943.theres the other graph which has lower deck speed
Hi bf109, do you have a link to these flight test reports? I'm working on some flight models for Il-2 1946 and I try to collect as much original documentation as I can to get perfs as close to reality as possible.La-5FN produced in May 1943 (#39210104) had a ground speed of 530 km/h in nominal mode and a maximum speed of 610 km/h, in October 1943 La-5FN (#39210495) had a ground speed of 542 km/h in nominal mode and a maximum speed of 620 km/h.
Unfortunately, I do not have copies of the reports. A table containing the results of tests of both prototypes and production airplanes with serial numbers was published in the magazine "Aviation and Cosmonautics" 2000/05-06 (in Russian). A scanned copy of the magazine is available on the Web.Hi bf109, do you have a link to these flight test reports? I'm working on some flight models for Il-2 1946 and I try to collect as much original documentation as I can to get perfs as close to reality as possible.
The "112" differed from the "111" only by the presence of a pneumatic starter instead of an electric one. The first two digits meant the reduction (11:16), and the last one - the starter type.So i just found out something interesting...
Ash-82-111 and Ash-82-112 are both written as 'M-82A' engines and usually distinction between them isnt made.
M-82-111 appears to be the one that was rated 1330 Horsepower at Military Power, 1570 horsepower with Take Off Power
M-82-112 was the optimised more reliable upgraded version with 1400 Horsepower at Military Power and 1700 with Take Off Power
IIRC, the I-185 was equipped with pneumatic starter. The three-digit production designations were introduced after I-185 testing began.I-185 M-82A prototype for example used the M-82-111 limited to 1570 Horsepower
IIRC, only the first production batch of the LaGG(LaG)-5 was equipped with electric starter ("111").La-5's introduced in July 1942 used M-82-111 engines but by Late 1942 they were already switching to M-82-112's
3-digit designations were used for the M-82F/FN as well.As '112' were still replacing the '111' in serial produced La-5's in Early 1943, thats when further upgraded M-82F engine was also approved
It was a piston engine, what afterburning? The M-82F had certain differences from the M-82A (usually the letter "A" was not specified in the official instructions) - intake pipe diameter was changed, cylinder cooling fins were increased, valve timing was changed.which was basically the afterburning M-82-112 engine
... due to the improvements mentioned above.that could maintain the 1700 horsepower regime at long periods of time.
There were two different I-185s with M-82 engines. The first was a redesign of the M-71 version, whereas the second version had a redesigned fuselage corresponding to the smaller frontal area of the M-82 - the performance of this variant was better. But the major problem was unreliable engine performance, which did not allow to achieve maximum power. The M-82 was intensively improved during the I-185 trials, and Lavochkin received a slightly more refined engine (although the fundamental problem with the carburetor remained).Seems like I-185 M-71 was eighter tiny bit more aerodynamically refined or I-185 M-82-111 didn't achieve even that full 1570 horsepower output.
Thanks.The first digit represents the engine reduction (1=11:16, 2=9:16, 3=0.56)
The second digit represents the compression ratio (1= CR of 7, 2=CR of 6.4)
The third digit represents the presence or absence of a pneumatic self-starter (1=no pneumatic self starter, 2=yes pneumatic self starter)
If the 3-digit modification code end in 'И', this means the engine has a single speed transmission. If it lacks the 'И', then it has a two-speed transmission.
This modification was intended exclusively for installation on the Il-2. I guess there were about a dozen "112I"s produced.If the 3-digit modification code end in 'И', this means the engine has a single speed transmission. If it lacks the 'И', then it has a two-speed transmission.