1. Of these parts, only the recuperator and front trail weighted over. 2. The recoil system consisted of a hydraulic recoil buffer and spring-driven recuperator . 3. It is visibly identified by having 2 recoil / recuperator cylinders above the barrel. 4. The gun had horizontal sliding breechblock, hydraulic recoil buffer and spring-driven recuperator . 5. The turbine design included a recuperator . 6. Leyland's use of a recuperator improved this considerably, but proved a maintenance problem. 7. The recoil system ( buffer and recuperator ) is mounted on the cradle above the barrel. 8. The buffer was mounted centrally in the cradle, between the two springs of the recuperator . 9. The term " recuperator " refers to a separated-flow, counter-current heat exchanger. 10. The barrel and recuperator are pulled back between the closed trails and locked in a travelling position.