Mikoyan MiG-25 Projects

[overscan (PaulMM)]

For the second time hesham, NOT PROJECT RELATED. Post in correct forum!

 

[hesham]

OK my dear PaulMM,

I am just wonderful from MiG-25 carried bombs,my apology.

 

[overscan (PaulMM)]

E-155P brochure from 1965. Note the canards.

90 pages of drawings in the PDF - link below.

[Airplane_E-155P]_Album_of_Drawings_1965_[PDF].7z

Посмотреть и скачать с Яндекс Диска

disk.yandex.ru

 

[overscan (PaulMM)]

The E-155 prototypes had mount points for canards (like the Ye-152 and E-8) but they proved unnecessary in flight testing.


Source: http://www.airwar.ru/image/idop/fighter/mig25p/mig25p-2.jpg

I added a link to the source document above.

 

[overscan (PaulMM)]

Drawing of E-155 (1960)

 

[Silencer1]

Drawing of E-155 (1960)

Seems, that this image is initial version of already published drawing:
ye-155p-jpg.105428

 

[overscan (PaulMM)]

Its actually just a bigger copy of the same drawing.

 

[Silencer1]

Its actually just a bigger copy of the same drawing.

These files are supplemented each other: the earlier one has clear inscriptions to the items, the later one - better image quality.

 

[Archibald]

Wait, it had skids like a X-15 or a Dynasoar ?

 

[GTX]

So what was the reasoning behind the canards - additional stability control?

 

[overscan (PaulMM)]

So what was the reasoning behind the canards - additional stability control?

The foreplanes on Ye-8, Ye-152 and potentially MiG-25 were intended to offset the change in centre of lift during the transition to supersonic flight. In subsonic flight the foreplanes were allowed to free-stream, but in supersonic flight they were locked in place to bring the centre of lift back forward and prevent some of the supersonic stability issues. Essentially the same concept as the glove vanes on the F-14 Tomcat.

They were found to be unnecessary on the MiG-25 and removed - probably to save weight. It was suggested that the horizontal intake ramps generated additional lift when supersonic which made the canards unneeded.

 

[overscan (PaulMM)]

Better copy of E-155 drawing.



The layout of one of the first variants of the E-155P aircraft with two Kh-155 missiles under the wing: 1 — Kh-155 missile; 2 - radar;
3 - radio station RSIU-5: 4 - defendant SRO "Khrom"; 5 - autopilot blocks; 6 - course system; 7 - short-range navigation system
gasia "Svod-I"; 8 — radio altimeter; 9 - power supplies; 10 - calculating device

 

[overscan (PaulMM)]

Preliminary attempt to understand E-155/MiG-25 design evolution in context of Ye-150 family.

 

[Basil]

So what was the reasoning behind the canards - additional stability control?

The foreplanes on Ye-8, Ye-152 and potentially MiG-25 were intended to offset the change in centre of lift during the transition to supersonic flight. In subsonic flight the foreplanes were allowed to free-stream, but in supersonic flight they were locked in place to bring the centre of lift back forward and prevent some of the supersonic stability issues. Essentially the same concept as the glove vanes on the F-14 Tomcat.

They were found to be unnecessary on the MiG-25 and removed - probably to save weight. It was suggested that the horizontal intake ramps generated additional lift when supersonic which made the canards unneeded.

Could also have provided some reduction in landing speed in off-loading the downforce of the horizontal tailplane.

 

[Deleted member 4286]

Here's the cutaway I think Motocar is referring to. However you need a big pinch of salt. In the book seating is one abreast down the LHS with an aisle to the right. The drawing shows two and an aisle something would have to be quite tiny....

New link for the Flight article https://www.flightglobal.com/class-struggle/48677.article

From "Unflown wings" Yefim Gordon and Sergey Komissarov. 2013. page 167