Originally Posted by
Vessbot
OK, let's talk about what's happening DURING the turn then. Do you notice anything unusual during the turn as you turn through the thousand knot self-created shear within a second? I don't. And my math is right, I just rechecked it:
final groundspeed minus initial groundspeed
(airspeed + tailwind) - (airspeed - headwind)
(1+500)-(1-500)
501-(-499)
1000
No No No You are talking about a person in an aircraft. The person walks toward the tail at 1 kt turns around and walks towards the nose at 1kt. But relative to the ground he is still moving with the aircraft
final groundspeed minus initial groundspeed
(airspeed + tailwind walk) - (airspeed - headwind walk)
(+500+1)-(+500-1)
=501-(499)
=2
If you don't think that's right, compare it with the ealier Cessna example, where the self-created windshear is 20 knots:
final groundspeed minus initial groundspeed
(airspeed + tailwind) - (airspeed - headwind)
(100+10)-(100-10)
110-90
20
OK that's 20 kts (say 10m/s) in say 1 minute at Rate 1 That's 10/60 m/s^2 = 0.17 m/s^2
That's 0.17/9.81 G = 0 .017G longitudinal g loading. You are not going to notice that are you?
Its as I say in my website: the effects are very small and easily missed
For both examples, the final and initial groundspeeds are states of equilibrium. But the 1000 knot and 20 knot wind shears? Those are happening during the turn, just as you say.
The second example is correct but they are both states of equilibrium
The situation that post 116 is a reply to, is a nonstarter. First, it's on an arrival procedure, where your track is anchored to the ground. So it does not apply to our discussion, which is premised on the motions being isolated to the airmass. Second, it starts with a tailwind and turns away from it (equivalent to turning into a headwind), so any purported effect should be an increase in performance and not a decrease! You note the same thing and dismiss the nose down effect as PIO overshoot of an initial nose up.