Attitude meter:
1. pitch angle: up and down
2. bank angle: left and right
A properly trimmed plane or a configuration wherein Vx (airspeed) and Vy (vertical airspeed)are sorta constant.
Add time component as well.
point A: (Vx1, Vy1, t1)
point B: (Vx1, Vy2, t2)
Case 1: No power change, pitch up, what's the relationship between V's?
Vy2 > Vy1; Vx2 < Vx1, where Vy2 is positive.
Case 2: No power change, pitch down, how V's change?
Vy2 < Vy1; Vx2 > Vx1, where Vy2 is negative
Note: Vy is +ve during the climb, -ve during the descent.
Can you climb forever without touching throttle?
No, you reach a certain point, then you loose the lift.
Can you descend forever without touching throttle?
Nope, you reach a certain point, you gain the lift.
In other words, by playing with pitch, you end up doing sinusoidal zigzag motion. That's the reason, you should keep Vy = 0 and then trim up.
We can talk about stalls some other time.
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