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Notice: This page is not subject to any update. For updated information please refer to the German pages of this website
or the publications by the author.
Three generations of engines with several subversions were built in the MiG-21 during 25 years of manufacturing. Because
of the limitations set by the fuselage there were only minor external differences between the different generations.
| Engine |
Versions |
Thrust (kN)* |
Remarks |
| R-11F-300 (37F) |
F, F-13, U |
38,2 / 53,4 |
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| R-11F2-300 (37F2) |
F-13, PF, FL |
38,7 / 60,0 |
F-13 refitted |
| R-11F2S-300 (37F2S) |
PF, PFS, PFM, R, S, M, US, UM |
38,2 / 60,6 |
with blown flaps (SPS) |
| R-11F2SK-300 (37F2SK) |
MF |
38,2 / 60,6 |
with nozzle correction device KDS |
| R-13 (95) |
M, MF, RF, SM, SMT, UM |
39,9 / 63,7 |
M refitted, UM also refitted |
| R-25 (25) |
bis |
40,2 / 69,6 |
thrust 97,1kN with special regime at low level |
* without / with afterburner
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Engine of the first MiG-21 generation: R-11.
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R-11 (part cutaway) from the left ...
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... and from the right.
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Externally the R-11 can be distinguished by its radially arranged flame stabilizers of the afterburner.
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R-11 complete with afterburner.
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The R-13 differs from the R-11 in having grooved inner surfaces of the engine housing, ...
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... seen here from the other side, ...
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... and a combination of star-shaped and circular flame stabilizers. (Photos R-13: author's collection)
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The R-25 also boasts grooved inner surfaces of the engine housing, but there are fewer rotor blades than on R-13 (21
instead of 24).
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The flame stabilizers of the R-25 are of circular shape.
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Not an engine in the true sense of the word: booster rocket SPRD-99 (seen here on a Finnish MiG-21bis).
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Like the MiG-21 its Chinese copies were fitted with externally almost identical engines of different generations.
| Engine |
Versions |
Thrust (kN)* |
Remarks |
| WP-7 |
J-7I, F-7A |
38,2 / 53,4 |
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| WP-7B |
J-7II, F-7B, JJ / FT-7 |
38,7 / 59,8 |
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| WP-7BM |
F-7M / P |
40,2 / 59,8 |
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| WP-7F |
J-7E |
44,1 / 63,7 |
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| WP-13F |
J-7III, F-7PG |
44,1 / 65,9 |
similar to R-13-300 |
* with / without afterburner
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The WP-7 differs from the Soviet engines in a special combination of circular and star-shaped flame stabilizers.
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