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Selection of the appropriate propulsion system for a high altitude long endurance aircraft such as the Boeing Condor, or a very long endurance air vehicle such as the Voyager aircraft, is strongly influenced by powerplant efficiencies.
Reflecting the above assessments, it is concluded that the turbocharged liquid cooled spark ignition engine is currently the most attractive candidate for powering a high altitude long endurance aircraft.
The propulsion system of the STRATO 2C High Altitude Long Endurance Aircraft (HALE) is an example for the development of a power plant which is tailored to a special unconventional usage and even though takes advantage of the reliability and low cost of available components as well as the high technology of turbine engines.
The STRATO 2C is an all-composite manned High Altitude Long Endurance Aircraft which will be used by the DLR1) to conduct stratospheric research work at altitudes up to 24 km.
System, A Low Cost Approach for a High Altitude Long Endurance Aircraft", AGARD CP 547, May 1993, Paper 17
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