Ligeti Stratos History
LGT Stratos History
The history of the Ligeti Stratos Begins with Charles and Helena Ligeti leaving
After arriving in Australia, Charles became a chemical engineer per his qualifications. He saw that he could now freely design, build and fly his own aircraft as an interest and began to do so. Charles and his wife Helena set about to design an aircraft,
This was the beginning of the Stratos. Charles put together drawings and they started making small foam models and remote control gliders that were used to figure out the wingtip orientations for stable flight in Yaw and Roll and wing orientations for the stall. They also experimented with control surfaces and realized potential for pitch-less lift and side slip maneuvers. A foot launched glider was also constructed to both have fun and compete in the Melbourne birdman rally, while also experimenting with the effects of scaling up the design.
Construction of the prototype S1 Stratos started in 1984, Charles worked to build the aircraft from sketches, designing mechanisms of the aircraft on the fly as he was building it. His construction techniques were learnt by helping other people build their homebuilt aircraft. Charles and Helena worked together for a solid year with many late nights, building the first Stratos. Many people who saw the aircraft said it would never even fly and totally dismissed it, yet determined Charles and Helena continued on their goals and dreams.
In 1985 the S1 Stratos was finished, the build quality and mastering the designs complexity was a real credit to them. They conducted three months of ground testing. On
After some convincing Charles and Helena started there own aircraft company with the aid of a financial backer in 1986. They then toured Nth America and
The second production S2 Stratos was made, aerodynamically the low speed stall characteristic changed compared to the S1 prototype Stratos causing a more pronounced stall similar to a conventional monoplane. The most notible changes to the design were an experimental high lift device to increase the rate of climb, unrecorded CG location on day of flight and near full span elevator on the canard, These changes caused the S2 Stratos to have a deeper (more conventional) stall then the prototype S1 Stratos. During the first test of the second variant S2 Stratos, the change in stall behaviour below 500ft AGL caught Charles off guard and claimed his life. The design was held after that point.
Today the first S1 prototype has been back engineered with it’s original aerodynamic layout and converted into 3D CAD models, The new design will incorporate an updated power plant, size increase, small engineering and maintenance refinements by Ron Ligeti. After analysis and secondary verification through scaled RC models,the reasons for the positive flight dynamics of the S1 are characterised and understood. After understanding the design properly Ron has now converted the CAD model of the Stratos into CNC code, the majority of the foam cores, plastic, alloy and wood part details have been machined. Final assembly has begun on the new S3 Stratos.