Mikoyan MiG-25 Projects

OK my dear PaulMM,

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

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So what was the reasoning behind the canards - additional stability control?
 
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.
 
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Better copy of E-155 drawing.

E-155.jpg

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
 
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.
 

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