I assume turbofan fan rpm could be increased only when:
- Using most modern jet engines (Airbus A380 and the Boeing B747-800)
- Using a magnetic gearbox which can handle more torque dor the same weight
- Fan and compressor blades are reinforced
- Design muffles and silences the fan sonic boom
- Engine is designed to prevent a flame out.
Assuming the problems above are solved, and one was able to redesign the fan and compressor blades to be efficient at 10 times their current rpm, without changing the power rating:
Would the engine have enough torque and power to spin the fan at cruise altitude?
What would be the effect on thrust?