ORIGINAL: Ian Davidson
Just like a conventional propeller, Power = Thrust x Pitch-speed. If the Power remains constant, then for the Thrust to increase (by increasing the diameter of the propellor), the Pitch-speed must decrease (by decreasing the pitch of the propellor)
Yes, but a turbine doesn't make thrust as an EDF. You have to make the engine run well first. If you open up the tailcone pressure will drop, it's not obvious that the engine can produce power with less pressure. I'm not that deep in to it, but it seem if you close the cone pressure and temprature will rise and creating more power. You can how ever trade speed for static thrust by adding a thrust tube after the engine.