Diameter:  109.5mm
Length:  220mm
Thrust:  6 kg @ 0.9 BAR
Max revs:  117,000 rpm
Temp:  570 deg C


Brian Green in Australia has produced his design that incorporates many of the modifications that have been made to the original Kamps and KJ type designs as well as some new ideas. The design is the first to be Certified by the MAAA under the Australian certification procedure. It follows the first successful Australian design, the JT67. It shows continuing worldwide interest in making homebuilt gas turbines.

The engine has been extensively bench tested before flight testing in an Australian design - the Bolly Scorpion.

The comprehensive plans come with a detailed written set of instructions and the design makes a welcome addition to the list of home built designs. The engine is based on the 66mm dia KKK compressor and 66 mm Dia Turbine wheel.


The front of the engine has a plastic plug-in insert and an aluminium outer cover. The case is made from an oil filter body (not the Gas canister used for the KJ66 design. The compressor is the usual KKK 2038 turbocharger. The combustion chamber is stainless steel (UK 316 or 310 spec). The NGV assembly at the rear and can be made from Inconel if longer life is required. The cast Inconel 713 turbine wheel used can be either the GTBA  wheel or the Artes wheel. The shaft is tool steel.


The engine is specified with the 2038 compressor wheel to have the highest throughput.

Turbine wheel

An engine like this needs a well made properly profile turbine wheel to make the most of its potential. Part of the secret of its very high performance/efficiency is the turbine wheel design. The wheels are available either in cast form and not drilled out or completed to a finished size. The balancing is achieved by grinding the small raised ring cast into the face of the wheel.


The engine uses the same ISO 608 bearings that the Kamps and KJ66 engine uses. The ball races are ceramic GRW bearings with a cage bearing at the front and a cageless bearing at the rear. The bearing tube is aluminium.


This is an engine that uses well understood principles and should provide a reliable design that is an alternative to the KJ66.


Unfortunately the plans for this engine are no longer available.