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LaGG-3 on Japan Air Force.

Aviation Discuss LaGG-3 on Japan Air Force. in the World War II - Aviation forums; Originally Posted by Mitya Yes is not present. Business was so. In the spring of 1942 one fighter have stolen ...


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Old 07-05-2008, 03:02 PM   #16
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Originally Posted by Mitya View Post
Yes is not present. Business was so.
In the spring of 1942 one fighter have stolen from Transbaikalia in supervised then Japanese Manchuria. The plane has made an emergency landing on a field with the removedchassis. After repair Japanese have decided to test LaGG-3. Flights have begun from September, 29. Definition of the basic characteristics of the machine was carried out{was spent} and educational fights with the Japanese fighters were conducted. The further destiny of this plane is unknown...
The book "Japanese Army Captured Aircraft-Secret Files" by K. Oshio and S. Nohara adds:
the a/c was tested by the CO of the 85th Fighter Regiment G. Yamamoto and a Sgt Yoshida. The a/c had to be repaired from the belly landing, and again when Japanese ground troops mistook it for an intruder and hit it with ground fire. This was in test in the Mudanjiang area in Manchuria. The a/c was later flown to Japan but wrecked in a landing accident along the way.

The book gives performance figures which presumably come the tests, since not the same as standard sources, but I'm not 100% sure, and some numbers look a little strange:
max speed 493 km/h at s/l
518km/h at 2,400m
(the book lists an alt of 4280m but then doesn't give the speed, typo in the book?, it's also possible the other two speeds are for 2.4km and 4.3km)
time to 3,000m: 3 min-40 sec
to 5,000m: 7 min-6 sec
to 8,000m: 17 min-13 sec

Some other accounts say this LAGG-3 was tested head to head v captured P-40 and Type 3 ('Tony'), all somewhat similar in basic arrangement and appearance, but this seems doubtful based on above account. The a/c based in Manchuria at the time, for informal tests, were Type 97 ('Nate') Type 1 ('Oscar') and Type 2 ('Tojo').

Bergstrom and Mikhailov in "Black Cross Red Star" Vol 1 discuss how individual examples of Soviet fighters produced ca. 1941-42 could have real performance much less than theoretical, more plane to plane variation than would usually be expected.

Joe
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Old 07-05-2008, 04:59 PM   #17
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(Were the rpm stated, too? My engine chart is for 2700 rpm.)
Kokko flew the track with 2600 rpm

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Another question: Were the speed tests was flown with radiator flaps open, too? That might make quite a pronounced difference for top speed values, of course.
I assume the speed track was flown radiators full open too.

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I have to admit that I couldn't find out the propeller diameter of the LaGG-3 accurately yet. From measuring a threeview, I assume it's 2.95 m, but if you have a different figure, that would be most welcome, too
There's no diameter for the propeller but the distance from the tip of the propeller to a vertical line below the wheels is 2285 / 1835 / 1511 mm, when α is +12°, 0° and -7,5°.

Post Scriptum. According to the report the maximum output for a M-105 PF is 1100 HP.

Martti

Last edited by Mangrove : 07-05-2008 at 05:04 PM.
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Old 07-05-2008, 05:55 PM   #18
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Hello Henning!

"LG-3" was weightened before the test and following values were marked down.

"Fuselage, engine and basic equipment": 2511 kg
"Pilot and his gear": 95 kg
"Fuel 450 L, Coolant and Oil": 480 kg
"12,7mm + 20mm + Radio": 85 kg
"Ammunition. 200x12,7mm + 140x20mm": 69 kg

This gives us 3240 kg.



Are you sure the Soviets tested their planes with full load and such? I'm asking this because sometimes the test are flown without realistic loads.

The differences at the speeds can be explained in two ways.:

1) The Finns didn't use their engines at maximum manifold pressure for the test because it would damage the engine. Report says the (corrected) pressure used was 1030 mm Hg.

2) The Soviets didn't use as much equipment at their planes as the Finns did. Finns always tested their planes at Full Combat Load.

Cheers

Martti
Yes. Are sure. In the USSR measured characteristics at full loading.
To you results:
I have asked not about Finns! I have asked about Japanese! Can not we shall flooding, and we shall answer in essence? Please. And? About Japanese LaGG in general that it is not known such... That me interests.
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Old 07-05-2008, 05:59 PM   #19
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...Bergstrom and Mikhailov in "Black Cross Red Star" Vol 1 discuss how individual examples of Soviet fighters produced ca. 1941-42 could have real performance much less than theoretical, more plane to plane variation than would usually be expected...
Joe
Thank You? Joe!
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Old 07-06-2008, 07:26 AM   #20
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I have asked not about Finns! I have asked about Japanese! Can not we shall flooding, and we shall answer in essence? Please. And? About Japanese LaGG in general that it is not known such... That me interests.
I beg your pardon! I don't think the Finnish LaGGs are generally known at the Aviation World so I though it would be nice to post a report on the test flights on this thread. Afte rall this is a "forum", a place to discuss things.
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Old 07-06-2008, 11:22 AM   #21
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I beg your pardon! I don't think the Finnish LaGGs are generally known at the Aviation World so I though it would be nice to post a report on the test flights on this thread. Afte rall this is a "forum", a place to discuss things.
So yes. It would be very interesting. Here you are right. I do not argue.
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