4 ms·
That is not accurate. The efficiency of turbofans goes up as speed increases. A normal commercial high-bypass turbofan is at its most efficient around 1000 km/h
by selectodude 7y ago
That is not accurate. The efficiency of turbofans goes up as speed increases. A normal commercial high-bypass turbofan is at its most efficient around 1000 km/h, which is a speed it cannot sustain at lower altitudes due to air resistance over the blades.
Just to add, at cruise, N1, the RPMs of the outermost fan on the jet, will peak over 100 percent, but that isn't a function of fuel consumption.
- pdonis 7y ago> The efficiency of turbofans goes up as speed increases. I didn't say efficiency, I said thrust. Nothing you said contradicts anything I said.
- selectodude 7y agoYou said that the engine has to burn as much fuel in cruise as it does during takeoff.
- pdonis 7y agoI said no such thing. I said the engine power had to be almost as high during cruise as during climb to altitude. Engine power setting is not the same as engine fuel consumption.