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Author Topic: The most accurate drawings of La-5  (Read 12553 times)
Massimo Tessitori
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« Reply #15 on: December 14, 2017, 09:03:39 PM »

Interesting indeed. My visual impression is thhat the cowling of La-7 is perfectly cylindrical, while the one of La-5 has a stranged and a bit more curved shape.
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Massimo
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Johann
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« Reply #16 on: December 14, 2017, 09:31:49 PM »

At absolutely identical form visual distortion gives La-5 because of a radiator and a hump of the compressor. On La-7 visual perception opposite amplifies, including because of new shutters which are more lifted up and give smoother contour of the fuselage.
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Johann
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« Reply #17 on: December 15, 2017, 07:54:34 AM »

Worked on the top projection. She already gets her look.

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Massimo Tessitori
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« Reply #18 on: December 15, 2017, 11:14:33 AM »

Hi,
interesting. But, is it sure that the angulation of the leading edge changed inside the landing gear? I've never noticed this.
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Massimo
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Johann
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« Reply #19 on: December 15, 2017, 03:59:22 PM »

Massimo - that's it. Here are the factory calculations. I can demonstrate the description of the wing in the Air Force Research Institute. There is described this feature of the wing because of which, by the way, the wing profile of NASA-230 which was corrected only on La-7 is not quite true ...

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Massimo Tessitori
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« Reply #20 on: December 15, 2017, 06:54:59 PM »

Should it be so on the LaGG-3 too?  I can see it on I-301 prototype, but not on production planes. Have you found photos where this characteristic is noticeable?
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Massimo
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Johann
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« Reply #21 on: December 15, 2017, 07:08:00 PM »

Hmm ... I think I should revise this point again more carefully. For example, in this photograph, the wedge in the area of the strap is not broken. And the wing of LaGG-3 and La-5 are identical except for the root of the wing ... Massimo thank you for making us doubt.

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Johann
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« Reply #22 on: December 15, 2017, 09:08:14 PM »

Massimo, you sow a grain of doubt in me. He began to suspect bad mating drawings. Checked in another book (Diagrams and drawings LaGG-3 41 years.) And there is the same picture. The angle of the leading edge along the center wing is 3.5 degrees, and the angle of the wing itself is 6 degrees. Accordingly, there should be a drop in the curves in the area of the wing clamping band ...





but the most interesting thing is that it is not visible in the photo (It seems that this may lead to a similar question: what was the hood - a straight or bulbous one ...
« Last Edit: December 15, 2017, 09:23:20 PM by Johann » Logged
Massimo Tessitori
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« Reply #23 on: December 16, 2017, 07:08:23 AM »

Hi,
factory drawings could be not in perfect scale. For example the section drawing of MiG-3 published many years ago (sorry I don't remember the author) was with the same length of the prototype I-200 n.04, but production MiG-3s were longer.
If there are explicitely written measures, it is another thing. Designers can modify them without modifying the drawing that is a lot of work, and they matter more than the drawing.
Are the inner part and outer part of the wing drawn together or separately?
If the angulation is visible as it is in a factory drawing, this is reliable, because the designer made it willingly; else, if it can be seen only after put together two different drawings, then it is suspect, because it can be due to an error.
The coincidence of drawings of LaGG-3 and La-5 is not a proof, because the drawings of La-5 were certainly obtained from those of LaGG-3 by overposition.
Is it possible to find measures of the first and second inner structures of the wing root?
You say that this characteristic of the wing was described in NII VVS report. How was this written? Keep into account that the first and second prototype of LaGG-1 had different wings.
Regards
Massimo
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Johann
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« Reply #24 on: December 17, 2017, 12:12:43 PM »

Nevertheless, there is a break in the wing. Not always visually on general plans it can be caught, it's only 2.5 degrees. But the blogger of his colleague, we found a few photos where it is particularly noticeable






« Last Edit: December 17, 2017, 12:14:45 PM by Johann » Logged
Johann
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« Reply #25 on: December 17, 2017, 12:23:25 PM »

For the purity of the experiment, independent comparison was made in different ways. But the result is one. I think factory sketches can be trusted.

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Johann
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« Reply #26 on: December 17, 2017, 01:29:04 PM »

A little more work on the plan from above.

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Johann
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« Reply #27 on: December 17, 2017, 01:32:12 PM »

But for comparison and LaGG-3, too, the curvature of the wing is noticeable.


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66misos
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Absence of evidence is not evidence of absence.


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« Reply #28 on: December 17, 2017, 03:05:48 PM »

Johan,
fanatastic work. Keep going.
Regards,
   66misos
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Johann
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« Reply #29 on: December 17, 2017, 09:21:50 PM »

Using the moment to later not be distracted made a lateral view of the three variants of La-5fn.










« Last Edit: December 17, 2017, 09:41:02 PM by Johann » Logged
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