Product overview
The Jinpengda LF90 Thunder turbojet engine is a powerplant primarily for small and medium UAVs, delivering a maximum thrust of 90 kg with a thrust-to-weight ratio of ≥7. Its construction combines a single-stage centrifugal compressor, a short annular combustion chamber and a single-stage axial-flow turbine. The annular intake uses an integrally cast casing with four support struts and a flow-straightening cone, while the exhaust has a fixed convergent nozzle. Maximum outside diameter is 235 mm, length is 514 mm and dry weight is 12.5 Kg.
The LF90 incorporates electronic control and a starter-generator mounted ahead of the compressor, with one ignition plug for starting. Generator output is 1000 W at 28 V. It uses RP-3 or JAT A fuel and an open lubrication system with 1–2% lubricating oil mixed into the fuel. The flight envelope covers 0–0.85 Ma and altitudes of 0–12000 m above sea level; starting covers 0–6000 m and 0–0.6 Ma. Rotational speed is 60000 r/min, specific fuel consumption is 0.126 Kg/(N·h), and the first-overhaul interval is 50 h or 200 starts.
