Ok, my take on this.
Primary effects of controls.
Elevators: up and down
Throttle: fast and slow.
However, the two always work in conjunction with each other and cannot be taken in isolation. For a constant throttle setting, pitch controls speed. For example, full throttle climb. For a constant altitude, throttle controls speed.
If we talk about straight and level flight, and increase the speed, we have to increase throttle. But, as we have trimmed for a set speed, we have to move the elevator to maintain straight and level, otherwise the aircraft would start to climb at the speed we had trimmed in level flight.
If we took the power off, the aircraft would decend at the speed we had trimmed in level flight. So, at this point you could argue that power controls pitch. You would be wrong. This is all to do with the AOA of the aircraft, flying fast requires a lower AOA. Flying slow, a higher AOA. This is all to do with weight (mass) and the required lift from the wing.
Hi Jonty,
Nice book, by the way, who's the ghost writer ;-)
My (simplified) take is as follows:
Speed is
always going to be a function of the angle of attack. Increase the angle of attack, the plane will fly slower, decrease the Angle of Attack, the plane will fly faster.
Now the $64.000 dollar question: What part of the aircraft controls Angle Of Attack?
Answers on the back of European Form EU50 (the brown one) or EU100 (the green one) to me here ;-)