If a ducted fan is not a true jet engine, could you make it one by adding heat the exhaust gasses with lasers or microwaves. My initial thought was lasers, but I came across a patent that suggested that water could be added to the air behind the compressor blades and then the air could be bombarded with microwaves.
This might allow jet engine like exhaust with fusion only (if lasers) or fusion plus water (if lasers and microwaves). Either way your logistical tail is reduced significantly.
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