The R-11 was
derived from the RD-9 and was first run in 1956. The Chengdu (China)
version is designated the WP-7.
The R-13 was a further development of the R-11 F2S-300 by V. Gavrilov.
Deliveries began in 1970.
- R-13-300: 14,550 lb (64.7 kN) afterburning thrust
- Compressor: 3-stage LP/3-stage HP
- Turbine: 2 single-stage