OK - time to some explanations:
1.
This is confusing. I thought that the S-37 tag was already used for the fwd swept wing berkut before it was upnumbered to Su-47 or has the Nato code system starting to confuse the hell out of me?
you are right. I am wondering too.... more because this one looks a lot like that single engine mig 1.44.... and he listed it sukhoi. may I see your refs or at least an explanation about this?
This is confusing. I thought that the S-37 tag was already used for the fwd swept wing berkut before it was upnumbered to Su-47 or has the Nato code system starting to confuse the hell out of me?
you are right. I am wondering too.... more because this one looks a lot like that single engine mig 1.44.... and he listed it sukhoi. may I see your refs or at least an explanation about this?
In 1989 Sukhoi bureau take order to make a new plane - frontline fighter / fighter-bomber plane to change on line planes like: Su-17/20/22, Su-25, Mig-23/27.
In 1992 the works was stopped (some elements of avionics have been used in Su-25TM) from the reason problems with money and decision that Russian didn't want a fighter with only one engine.
Later Sukhoi tried to interest this plane a Arabian countries.
It was project of aircraft like Gripen, but bigger - with 18 points for weapon (5,0-8,3 t of weapon), engine R-79M (181 kN).
Is your drawing above meant to be this:
(...)
(...)Or this:
(...)
Jabba:
S-56 was started from training S-54
Later on the base of the training S-54 was made a combat version. After some time a name of combat version was changed to S-56.
So - on the first two draws You have this S-54/S-56.
Later the Sukhoi decided to made next version - with engine AL-41F or R-79M - You have it on third draw - and I made this plane which I draw.