New Russian OOB (or SPR OOB)

[Marcello]

"Whence at you such data on SU-7BMK?"

A piece here and there on the internet.

"Usually on all series Su-7 - 2 fuel tanks were established only. About 4 fuel tanks I have found nothing."

I have rechecked my notes. What I found is that
fuel tanks could be carried on the two under fuselage pylons and starting from the SU-7BM even on the two inner underwing pylons. But you are correct, four fuel tanks was a "ferry" configuration and usually was not done in practice.

"Su-7BMK - Had 8 hardpoints. Su-7BMK - differed from Su-7BKL older equipment. The truth is written that Egyptians without the permission - modernised Su-7BMK and have increased quantity hardpoints to 8 pieces. Then the USSR and made them with 8 hardpoints = 3300 kg."

When was this carried out?

[KraMax]

First deliveries Su-7BMK were in the middle of 1966. They participated in war with Israel, the truth not successfully - from 64 planes 27 has been destroyed on the earth in the first day of war on Jule, 5th, 1967.
After that the USSR has put many these planes for Egypt (it is not specified how much precisely). With assistance of the West German firm, the Egyptian planes have been modernised and on them have established in addition 2 hardpoints. Exact date it is not informed, but it is possible to assume what is it has occurred in the end of 1967 or in the beginning to the middle of 1968 since in 1969 of the USSR also built planes with the same quantity hardpoints.