A VTOL aircraft powerplant choosing between a low-power, turbofan mode during cruise flight and a high-power, lift fan mode during vertical flight. Turbofan mode is a gas turbine engine's shaft power driving a remote front fan. Its fan flow goes to thrust for cruising flight. During VTOL, front fan output enters a boost compressor. It produces the compressed air for a combustion chamber which feeds a large lift-fan turbine. That is the implementation of lift-fan mode. The boost compressor has more stages than the front fan and is a big added load. The gas turbine engine is supercharged to turn that added load: Part of the boost compressor output is taken during VTOL. This is a new version of the supercharging. During cruise flight, a low pressure turbine stage is bypassed to match the lesser load. That completes the apparatus for a variable-cycle VTOL engine.
This information is part of a study by Oasis Global, Inc. of all space inventions filed at the United States Patent and Trademark Office, and is provided for informational purposes only. It is not an endorsement of any particular assignee, inventor or invention. Although Peter A. Koziol represents inventors and assignees of space inventions he does not represent all of the inventors and assignees listed. The prosecuting attorney agent or firm for each patent is identified by the United States Patent and Trademark Office in the patent specfication, which can be viewed by clicking on the patent image or downloading the patent document. For more information regarding Mr. Koziol's background and experience, or to learn more about space inventions, please contact Mr. Koziol.
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