The S-37 (Su-47) was developed for Soviet heavy aircraft-carrying cruisers. They did not have steam catapults. The reverse sweep of the wing creates additional lift for the aircraft, but vibrations in the wings appear at high speeds. The twisting moment. Because of this, the C-37 project was closed. Only one "Berkut" was built.

Prototypes for this aircraft:
- S-37 (Su-47)
- MiG-23

Yes

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Oh, my goodness what a wonderful combat jet.

Looks great! I gotta love me some swing wings!

Ooooh.

I always loved the design for the S-37. It just has a design that screams 'predator'.

Yes, but this design has an aerodynamic problem. Vibration in the wing at speeds above 700 km/h and torque.

Ah, suppose it makes sense why such a config. is rarely seen then. Heck off the top of my head I can't think of another plane that has this sort of thing.

The Soviet aircraft carriers did not have steam catapults (only the new aircraft carrier Ulyanovsk was to receive catapults), so aircraft designers were looking for the design of the aircraft with great lift (ascensional power).
S-37 (Su-47) it was one of the projects. I just added a variable wing geometry like the MiG-23 or Su-17.
But our engineers found a more interesting and technologically advanced solution - the Su-33 and Mig-29K.