The combustion engine bears the main load and is powered by fuel which has ultimate power density in contrast to conventional batteries. Unfortunately combustion engines are not very dynamic. We have developed an elaborated system with an electrically powered alternate/hub shaft. This shaft is directly coupled to the combustor to relate accelerations and delay values, effectively empowering the quadcopter to fly as stable as e-flight-only, giving it more power for a longer period of time.
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