I agree that for the most part using brushless electric motors fits the bill. I did weight and volume calculations, using the volume calculations for reactors I made before 4th ed, and the swap was volumetrically equivalent and slightly lighter.
The only reason I brought up electric jets before was for the reason you mentioned, speed. My question at the time was would there be a need for high-speed cross country air travel. At the time, most did not think so.
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