Suhoj Su-22 :: Nauka ~ Tehnika ~ Military

razlike i slichnosti izmedju su-17/20/22

odavde

You are correct in stating that the Su-17 is the designation for all swingwing-Fitters the Soviets used, but the export designations Su-20 and Su-22 are nowhere near as simple as you describe them. They range from aircraft identical to their Soviet-fellows (the Polish Su-20 series don't differ from the Russian Su-17M's) to aircraft with totally different engines and/or aerodynamics.

Fun, huh?

Here's an overview of swingwing-Fitters, with first the VVS-designation for the AL21 powered variants, and then the equivalent export version(s).

Su-7IB - prototype - Fitter B
Su-17 - preseries, still Su-8 fuselage - Fitter C
Su-17M - Su-20 - Fitter C
Su-17M2 - Fitter D
with an R29 engine, this becomes a Su-22M-2 Fitter F.
Su-17M3 - Su-22M3 - Fitter G (Su-22M3 only exported to Hungary and identical to Su-17M3)
Su-22M3K - R29 powered export version, Fitter J
Su-17M4 - Su-22M4 (identical) - Fitter K

Want more?
Trainers:
Su-17UM-2 with AL21, or R29 powered Su-17UM-2K/Su-22UM-2 (and then again, you can shuffle the suffixes if you want too) Fitter E

And:
Su-17UM-3 and Su-22UM-3 (identical, Fitter G)
or, as R29 powered, Su-22UM-3K (also Fitter G)

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the Su-17 was actually the initial variant, exported to Poland, Egypt, Iraq and Syria under the designation Su-20. So far I haven't seen even a single example in Soviet insignia.

Then came the Su-17M (with a pretty much redesigned fuselage) exported under the designation Su-22M to Libya and Peru, followed by the Su-17M2, Su-17M3 and Su-17M4, each of which had an export counterpart, namely Su-22M2K, Su-22M3K and Su-22M4K, respectively (for example, Su-22M-2Ks were exported to Iraq and Libya, Su-22M3Ks to Angola, Syria, Peru and Libya; and Su-22M4Ks
to Afghanistan and Iraq).

Su-17M3 and Su-17M4s were also used massively by the Soviet 16th Air Army, stationed in East Germany, during the late '70s and a good part of the '80s, but were then slowly replaced by MiG-27s. They were, however, also used by the Czehoslovakian and Hungarian air forces (Czechs are apparently still using Su-17M4s and Su-17M4Rs, the last is a recce variant, capable of
carrying a large recce container under the centreline).

takodje pogledati ovo