Hi Jan and everyone, although I looked for the answer, I couldn't find anything. What do these two dots mean, the magenta and the green? They got further away the higher I was.
A350 question
-
Green Dot Speed is the speed that provides the best lift-to-drag ratio. Best for engine out, one or two engine climb and whenever efficiency is at premium.
Regarding the magenta dot you have to ask an expert - like Jan
-
I might be wrong but the magenta dot is the managed target speed commanded by the Flight Management System (FMS). It changes depending on the climb/descent phase, cost index, and speed constraints. In cruise, it usually reflects the ECON speed the FMS wants for optimal fuel burn/time.
-
Your green dot speed will increase as your altitude increases. Your entire speed margin narrows as you approach coffin corner; it all depends on the aircraft's gross weight and air density (this sim only simulates ISA conditions and a fixed GW near Max landing weight)
-
Thanks, What I find strange is that in the first image the green dot keeps going up, even at a very high speed.
Again, I might be wrong but my guess is that it's actually normal for Airbus logic, even though it looks strange.
The green dot speed isn’t linked to how fast you’re currently going but it’s more of a reference speed, calculated from the weight (heavier aircraft means higher green dot speed), altitude (higher altitude means thinner air and therefore higher true airspeed for same lift)...
So even if you’re already going fast, the green dot will keep climbing with altitude because the air density is dropping. To maintain the same lift-to-drag ratio and climb performance, you need a higher indicated speed so the “green dot” creeps upward on the tape as you climb.
That’s why in the screenshot it’s still rising, even though you’re already near Mach 0.9... it’s not “chasing” your current speed, it’s just showing where that best lift/drag point is for your current weight and altitude.
-
I recommend to inform the FCOM of the respective aircraft type. These can be downloaded for many commercial aircraft at different places on the Internet. For the A350 I have for example the version "A350 FLIGHT CREW OPERATING MANUAL" from "virgin atlantic" from 2019-07-01.
(1) To the GREEN DOT is there:
(2) To the V2 is there:
(3) For the TAKE OFF SPEDS and MANAGED SPEEDS ist there:
