Williams WR24-7 Turbojet engine
A nice little turbojet engine manufactured by Williams International. An innovative design featuring compressor air driven accessories including the fuel and oil systems with electronic control. Descended from the previous model the WR24 the engine features an additional axial compressor section. A relatively conventional small engine design but uses no driven accessories or external electric motors. Compressor bleed air is used to pressurise the fuel system and an electronic control unit senses engine speed from the generator and effects proportional fuel flow control with a valve mounted adjacent to the electronic control unit. Lubrication is achieved by creating an “oil mist” again using compressor air discharging through a venturi. Oil is drawn up from a small reservoir and a mist is formed that is ducted to the bearings. A special switched reluctance generator unit provides power to recharge batteries and power avionic equipment on the attached airframe.
More detailed and useful info here published by Thomas Baumgart
Williams WR24-7 Specification
Thrust Output………………………………..………………………………………………..…….180Lbs
RPM……………………………………………………………………………………………………..….60,900
Compressor……………………single stage axial followed by single stage centrifugal
Combustor………………………………………………….….disc-shaped with rotary atomiser
Turbine…………………………………….……………………………………….single stage axial flow
Layout………...........….single shaft turbojet supported on ball and roller bearings
Fuel system……….….……electronic control and governor pressurized with P2 air
Ignition System………………………………………………….…………high energy plug igniter
Starting System………………………………………….....…………………………air impingement
Oil system……………………………total loss oil mist system created by P2 air venturi
Accessories……………………………………switched reluctance generator on main shaft
Application……………………………………………………………………….…Chukar Target drone
Similar Models…………………………………………………………………………………...WR27 APU
