overscan said:The earliest studies were done by Sukhoi before "official" interest, Feb/March 1968, and officially designated in June 1968 as SPB (Samolyot Polya Boya, Battlefield Aircraft) with the T-8 production name. These included the earliest version of the above layout plus other layouts like a twin boom one.
In early 1969, an official requirement was formulated and announced in May 1969 as LSSh. Sukhoi's favoured SPB design was submitted to the LSSh requirement.
So both designations are correct.
Scans appear to be from Ildar Bedretdinov's The Attack Aircraft Su-25 and its Derivatives (B & Co, 2002)
Wow? The engines superficially look like afterburning Adours, especially the nozzle shape. Definitely not RD-9 and the only other contemporary Soviet option would have been the AI-25. Maybe an AI-25 with a hypothetical afterburner section? Were there any dates or specifications associated with this drawing?Here a three-view-drawing showing an earlier configuration of the Sukhoi SPB (Samolyot Polya Boya, Battlefield Aircraft) aka "Su-25".
Please notice the different aft section and engines configuration compared to the other three-view-drawings featured in this topic.
Source: Russian publication "Sukhoi Design Bureau - 85th anniversary", only for distribution among Sukhoi employees and in some Russian libraries, page 656.
Edit: Better picture
That's bloody awesome thanks fightingirish!!Here a three-view-drawing showing an earlier configuration of the Sukhoi SPB (Samolyot Polya Boya, Battlefield Aircraft) aka "Su-25".
Please notice the different aft section and engines configuration compared to the other three-view-drawings featured in this topic.
Source: Russian publication "Sukhoi Design Bureau - 85th anniversary", only for distribution among Sukhoi employees and in some Russian libraries, page 656.
Edit: Better picture